期刊：
Journal of Energy Storage,2025年134:118101 ISSN：2352-152X
通讯作者：
Linping Yu
作者机构：
[Yanmei Nie; Yifei Yan; Boning Wu; Tianlang Wen; Linping Yu] Hunan Province Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Pharmaceutical Engineering, Changsha University of Science & Technology, Changsha 410114, China;[Tao Wan] Hunan Electric Power Corporation Research Institute, Changsha 410036, China
通讯机构：
[Linping Yu] H;Hunan Province Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Pharmaceutical Engineering, Changsha University of Science & Technology, Changsha 410114, China
摘要：
Lithium metal, a widely recognized anode material for next generation high energy density batteries, is hindered by challenges such as dendrite growth and interfacial instability. Lithiophilic MnO 2 based current collectors have demonstrated potential in regulating lithium deposition. However, the critical relationship between MnO 2 phase selection, structural stability, and electrochemical performance remains poorly understood. In this study, we employ density functional theory (DFT) calculations to guide the fabrication of MnO 2 based current collectors, followed by a dual functional modification strategy through reductive and conductive polydopamine (PDA) integration. This approach synergistically enhances both the electronic conductivity and structural stability of δ-MnO 2 . The reductive nature of PDA induces partial conversion of Mn 4+ to Mn 2+ , generating oxygen vacancies (Ovs) that facilitate Li + diffusion, while its conjugated polymer framework significantly improves electrical conductivity. The optimized electrode achieves uniform lithium deposition with an average coulombic efficiency (CE) of 98.5% over 300 cycles at 1 mA cm −2 . This work presents a novel theoretical and experimental approach to designing durable, dendrite suppressing current collectors, representing a significant step toward practical lithium metal batteries.
Lithium metal, a widely recognized anode material for next generation high energy density batteries, is hindered by challenges such as dendrite growth and interfacial instability. Lithiophilic MnO 2 based current collectors have demonstrated potential in regulating lithium deposition. However, the critical relationship between MnO 2 phase selection, structural stability, and electrochemical performance remains poorly understood. In this study, we employ density functional theory (DFT) calculations to guide the fabrication of MnO 2 based current collectors, followed by a dual functional modification strategy through reductive and conductive polydopamine (PDA) integration. This approach synergistically enhances both the electronic conductivity and structural stability of δ-MnO 2 . The reductive nature of PDA induces partial conversion of Mn 4+ to Mn 2+ , generating oxygen vacancies (Ovs) that facilitate Li + diffusion, while its conjugated polymer framework significantly improves electrical conductivity. The optimized electrode achieves uniform lithium deposition with an average coulombic efficiency (CE) of 98.5% over 300 cycles at 1 mA cm −2 . This work presents a novel theoretical and experimental approach to designing durable, dendrite suppressing current collectors, representing a significant step toward practical lithium metal batteries.
关键词：
Calcium salt of hexahydrophthalic acid;Crystal water;Nucleation efficiency;Mechanical property;Isotactic polypropylene;Nucleating agent
摘要：
The calcium salt of hexahydrophthalic acid (HHPA-Ca), an effective nucleating agent for isotactic polypropylene (iPP), was synthesized through neutralization. The presence of crystal water in HHPA-Ca may significantly influence the processing and performance of iPP. In this study, HHPA-Ca was dehydrated to eliminate crystal water (HHPA-Ca-RCW), and its properties were compared to those of undehydrated HHPA-Ca (HHPA-Ca-CW). The structural characteristics of HHPA-Ca, both before and after the removal of crystal water, were analyzed using Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The influence of crystal water on the nucleation of iPP was investigated via differential scanning calorimetry (DSC), polarized optical microscopy (POM), and mechanical property testing. The results demonstrate that HHPA-Ca-RCW exhibits higher nucleation efficiency in iPP, leading to an increase of 8.1 degrees C in the crystallization peak temperature (Tc) upon the addition of 0.04 mass%. This modification also promotes the rapid formation of a significant number of spherical crystals. Moreover, HHPA-Ca-RCW, when incorporated into nucleated iPP, maintains toughness of iPP while showing a modest enhancement in stiffness.
摘要：
This study investigated the synergistic effects of trehalose incorporation, precooking methods (steaming and frying) and reheating on optimizing the textural and flavor profiles of frozen precooked Chinese shrimp ( Fenneropenaeus chinensis ) products. Incorporating trehalose soaking before precooking treatments imparted the shrimp attractive red-yellow coloration while achieved notable reductions in cooking loss (steamed: 22.87%→17.31%; fried: 32.57%→25.58%) and freeze-thaw loss (steamed: 5.92%→2.29%; fried: 2.68%→1.07%). Steaming pretreatment combined with trehalose soaking effectively inhibited ice crystal formation in the shrimp, resulted in relatively intact fibrous tissue during frozen storage and promoted the production of taste and odor in the products. Subsequent microwave reheating substantially enriched desirable flavor compounds of the frozen precooked shrimps. The results indicated that synergistic application of trehalose soaking and steaming precooking effectively mitigated the quality deterioration of precooked shrimp during frozen storage. These findings established an innovative processing strategy that enhanced both the sensory quality and commercial viability of frozen precooked shrimp products.
This study investigated the synergistic effects of trehalose incorporation, precooking methods (steaming and frying) and reheating on optimizing the textural and flavor profiles of frozen precooked Chinese shrimp ( Fenneropenaeus chinensis ) products. Incorporating trehalose soaking before precooking treatments imparted the shrimp attractive red-yellow coloration while achieved notable reductions in cooking loss (steamed: 22.87%→17.31%; fried: 32.57%→25.58%) and freeze-thaw loss (steamed: 5.92%→2.29%; fried: 2.68%→1.07%). Steaming pretreatment combined with trehalose soaking effectively inhibited ice crystal formation in the shrimp, resulted in relatively intact fibrous tissue during frozen storage and promoted the production of taste and odor in the products. Subsequent microwave reheating substantially enriched desirable flavor compounds of the frozen precooked shrimps. The results indicated that synergistic application of trehalose soaking and steaming precooking effectively mitigated the quality deterioration of precooked shrimp during frozen storage. These findings established an innovative processing strategy that enhanced both the sensory quality and commercial viability of frozen precooked shrimp products.
摘要：
Luminescent metal-organic frameworks (MOFs) are used for the detection of organophosphorus pesticides (OPs) due to their large surface area and pore volume as well as their special optical properties. However, most self-luminescent MOFs are not only complex to synthesize and unstable in water but also feature a "turn-off" sensing system, which has highly restricted their practical applications in OP detection. Herein, a "turn-on" fluorescence sensor based on the guest-induced luminescence MOF Ru(bpy)(3)(2+)@UiO-66 was constructed, which realized the sensitive detection of OPs through a dual-enzyme system for the first time. Compared with self-luminescent MOFs, Ru(bpy)(3)(2+)@UiO-66 was not only more easily synthesized but also had higher chemical and photostability in water. In this strategy, by means of the hydrolysis of AChE and ChOx, H(2)O(2) will be produced, which can oxidize Fe(2+) to Fe(3+), thereby quenching the fluorescence of Ru(bpy)(3)(2+)@UiO-66. In the presence of OPs, the activity of AChE can be inhibited, resulting in the inability to generate H(2)O(2) and Fe(3+), which will turn on the fluorescence signal of Ru(bpy)(3)(2+)@UiO-66. As a result, the Ru(bpy)(3)(2+)@UiO-66 sensing system not only had high sensitivity for OPs detection but also possessed a satisfactory detection recovery rate for parathion-methyl in real samples, which provides a new approach for OP detection in food safety as well as environmental monitoring.
作者：
Li Yaqi;Dai Yimin;Cai Ling;Yang Siwen;Wang Junlong;...
期刊：
Journal of Molecular Liquids,2025年424:126995 ISSN：0167-7322
作者机构：
[Li Yaqi; Dai Yimin; Cai Ling; Yang Siwen; Wang Junlong; Liu Bo; Ding Xianglong; Zhang Yue-Fei; Li Yan; Lu Cuihong; Wan Li] School of Chemistry and Chemical Engineering, Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, Hunan Provincial Key Laboratory of Cytochemistry, Changsha University of Science and Technology, Changsha 410114 PR China
摘要：
Using aniline and environmentally friendly chitosan as raw materials, MnFe 2 O 4 with photocatalytic properties was introduced and in-situ polymerization was used to prepare Cht/PANI/MnFe 2 O 4 . The Cht/PANI/MnFe 2 O 4 was characterized by FTIR, SEM, XPS, XRD, BET and TGA. The experiment on the influence of pH on the adsorption capacity of the material shows that an acidic environment is conducive to the adsorption of fuel by the adsorbent. The zero charge point (pH PZC ) on the adsorbent surface is obtained at pH 6.45. The adsorption kinetic model conformed to the pseudo second order model, and the adsorption isotherm was in agreement with the Langmuir isotherm model. The q max values of Cht/PANI/MnFe 2 O 4 and Cht/PANI were 202.84 and 148.37 mg·g −1 . Experimental results have shown that Cht/PANI/MnFe 2 O 4 exhibits photocatalytic performance, which is superior to pure MnFe 2 O 4 .The maximum removal amount of Cht/PANI/MnFe 2 O 4 at equilibrium is 2569.66 mg·g −1 . The photocatalytic process of Cht/PANI/MnFe 2 O 4 also conforms to the pseudo-second-order kinetic model. The material has the advantages of simplicity and environmental friendliness and has potential application prospects in the purification of dye wastewater. The study proposed possible mechanisms for the adsorption and photocatalysis of CR.
Using aniline and environmentally friendly chitosan as raw materials, MnFe 2 O 4 with photocatalytic properties was introduced and in-situ polymerization was used to prepare Cht/PANI/MnFe 2 O 4 . The Cht/PANI/MnFe 2 O 4 was characterized by FTIR, SEM, XPS, XRD, BET and TGA. The experiment on the influence of pH on the adsorption capacity of the material shows that an acidic environment is conducive to the adsorption of fuel by the adsorbent. The zero charge point (pH PZC ) on the adsorbent surface is obtained at pH 6.45. The adsorption kinetic model conformed to the pseudo second order model, and the adsorption isotherm was in agreement with the Langmuir isotherm model. The q max values of Cht/PANI/MnFe 2 O 4 and Cht/PANI were 202.84 and 148.37 mg·g −1 . Experimental results have shown that Cht/PANI/MnFe 2 O 4 exhibits photocatalytic performance, which is superior to pure MnFe 2 O 4 .The maximum removal amount of Cht/PANI/MnFe 2 O 4 at equilibrium is 2569.66 mg·g −1 . The photocatalytic process of Cht/PANI/MnFe 2 O 4 also conforms to the pseudo-second-order kinetic model. The material has the advantages of simplicity and environmental friendliness and has potential application prospects in the purification of dye wastewater. The study proposed possible mechanisms for the adsorption and photocatalysis of CR.
通讯机构：
[Cao, Z ] C;[Xu, F; Sun, LX ] G;Changsha Univ Sci & Technol, Sch Chem & Chem Engn, Hunan Prov Key Lab Mat Protect Elect Power & Trans, Changsha 410114, Peoples R China.;Guilin Univ Elect Technol, Sch Mat Sci & Engn, Guangxi Key Lab Informat Mat, Guilin 541004, Peoples R China.;Guilin Univ Elect Technol, Guangxi Collaborat Innovat Ctr Struct & Properties, Sch Mat Sci & Engn, Guilin 541004, Peoples R China.
摘要：
Developing a highly sensitive enzyme-free glucose sensor is critical, given the significant health risks posed by diabetes. In this study, a ZnO@CuCo2O4 composite with a novel flower-like heterostructure assembled by nanorods is prepared utilizing straightforward hydrothermal and calcination processes. The core-shell ZnO@CuCo2O4 featuring ZnO as the core and CuCo2O4 as the shell can improve the agglomeration phenomenon of CuCo2O4, expose more active sites, and promote efficient electron transfer. A ZnO@CuCo2O4 based non-enzyme glucose sensor is constructed and tested for the first time, which exhibits good sensing performance, a low limit of detection of 0.82 mu M, with broad linear ranges of 10-1725 mu M and 1725-9225 mu M, yielding sensitivities of 898 and 524 mu A mM-1 cm-2, respectively, and a rapid response time of only 2 seconds. Furthermore, it shows excellent selectivity, long-term stability (retaining 92.42% of its initial response current after 20 days), and good reproducibility, including in real saliva samples. The superior sensing performance of the ZnO@CuCo2O4 sensor can be attributed to the synergistic effects of the core-shell n-p heterostructure, the integration of amorphous and crystalline dual phases, and the flower-like structure, which collectively optimize electron transfer and electrocatalytic activity. This work offers a cost-effective and innovative strategy for advancing enzyme-free glucose sensing technologies.
摘要：
Herein, we report the use of a bromine atom as a masking group for the synthesis atropisomeric diarylamines via organocatalytic N-arylation of 7-bromoindolines. The bromine atom acts as a bulky group to temporarily stabilize the configuration by steric hindrance. Upon unmasking, less sterically hindered diarylamines are obtained, with configurational stability potentially maintained through intramolecular hydrogen bonding. Moreover, the gram-scale reaction and post-modifications of the axially chiral diarylamines demonstrated the utility of this protocol. Thermal racemization experiments combined with X-ray crystallography revealed the respective contributions of steric repulsion and intramolecular hydrogen bonding in stabilizing the configurations. This approach not only provides a useful method for the atroposelective construction of conical diarylamines, but also paves the way for a better understanding of stable axial chirality and its role in shaping chemical reactivity and biological activity.
期刊：
Journal of Energy Storage,2025年135:118394 ISSN：2352-152X
通讯作者：
Zhenggang Wang<&wdkj&>Xichao Liang
作者机构：
[Shuting Deng; Chenhui Wang; Zeyang Meng; Huo Yang; Wu Long; Yuxin Deng; Zhenggang Wang] Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Pharmaceutical Engineering, Changsha University of Science and Technology, Changsha 410114, PR China;[Bo Hu; Xichao Liang] Research and Application of Regenerative Cellulose Fiber Key Laboratory of Sichuan Province, YiBin Grace Group Co., LTD, Yibin 644000, PR China;[Daxiong He] Hmei Thread Co., LTD, Yibin 644000, PR China
通讯机构：
[Zhenggang Wang] H;[Xichao Liang] R;Research and Application of Regenerative Cellulose Fiber Key Laboratory of Sichuan Province, YiBin Grace Group Co., LTD, Yibin 644000, PR China<&wdkj&>Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Pharmaceutical Engineering, Changsha University of Science and Technology, Changsha 410114, PR China
摘要：
Heterojunction electrode materials derived from MOFs have been shown to effectively improve capacity and rate performance. In this paper, ZnS/Co 9 S 8 (ZCS) heterojunction is successfully embedded in the three-dimensional spatial structure composed of cellulose fiber and MXene, forming a unique composite system by solvothermal method and electrostatic self-loading technology. ZCS particles are well dispersed to the fiber substrate and MXene, exhibited a large specific surface area of 54.80 m 2 g −1 and high level of structural defects, which providing abundant active sites for Li + . The Li ion battery prepared by ZnCoSCF@MXene (ZCSCF@MXene) exhibited high specific capacity of 1549.1 mAh g −1 at 1 A g −1 and excellent magnification performance of 632.3 mAh g −1 at 6.4 A g −1 . The outstanding performance of the ZCSCF@MXene electrode is due to multiple factors, such as the intrinsic electric field created by the ZCS heterostructure, the nitrogen-doped cellulose fiber matrix expanding the contact area between the electrode material and the electrolyte, and the MXene provides a swift route for electron transport, which not only boosts electron dynamics but also successfully prevents the aggregation of ZCS. This paper provides a reference for the composite of heterostructures with cellulose fiber, and provide a new idea for the design of negative electrode materials with high performance metal sulfide heterostructures.
Heterojunction electrode materials derived from MOFs have been shown to effectively improve capacity and rate performance. In this paper, ZnS/Co 9 S 8 (ZCS) heterojunction is successfully embedded in the three-dimensional spatial structure composed of cellulose fiber and MXene, forming a unique composite system by solvothermal method and electrostatic self-loading technology. ZCS particles are well dispersed to the fiber substrate and MXene, exhibited a large specific surface area of 54.80 m 2 g −1 and high level of structural defects, which providing abundant active sites for Li + . The Li ion battery prepared by ZnCoSCF@MXene (ZCSCF@MXene) exhibited high specific capacity of 1549.1 mAh g −1 at 1 A g −1 and excellent magnification performance of 632.3 mAh g −1 at 6.4 A g −1 . The outstanding performance of the ZCSCF@MXene electrode is due to multiple factors, such as the intrinsic electric field created by the ZCS heterostructure, the nitrogen-doped cellulose fiber matrix expanding the contact area between the electrode material and the electrolyte, and the MXene provides a swift route for electron transport, which not only boosts electron dynamics but also successfully prevents the aggregation of ZCS. This paper provides a reference for the composite of heterostructures with cellulose fiber, and provide a new idea for the design of negative electrode materials with high performance metal sulfide heterostructures.
摘要：
This study aimed to investigate the improvement effects of a silver carp muscle hydrolysate (SCMH) on freeze-thaw (FT) tolerance of baker's yeast and the related mechanism. Yeast cells with or without addition of SCMH were subjected to 0 to 6 FT cycles, and their cell viability, leavening activity, growth kinetics, morphology, and transcriptome were examined. The results showed that the SCMH-added yeast had significantly higher cell viability (40.7%), leavening activity (473.2 mL·kg -1 ·h -1 ), and maximum specific growth rate (2.63 h -1 ) than those in control (CK) group (0%, 287.2 mL·kg -1 ·h -1 , and 1.74 h -1 , respectively), after 6 FT cycles. Frozen-thawed yeast with SCMH also exhibited better cell structural integrity compared to that of the CK yeast. Transcriptomic analysis revealed that the incorporation of SCMH led to significantly increased counts of differentially expressed genes (DEGs) in yeast cells after 6 FT cycles, and transcriptionally regulated the pathways associated with ribosome biogenesis and function, amino acid metabolism, carbohydrate metabolism, and lipid metabolism. Therefore, the SCMH could help yeast withstand FT stress, likely via a dual mechanism for inhibiting ice growth and inducing some freeze-adapted transcriptional regulation.
This study aimed to investigate the improvement effects of a silver carp muscle hydrolysate (SCMH) on freeze-thaw (FT) tolerance of baker's yeast and the related mechanism. Yeast cells with or without addition of SCMH were subjected to 0 to 6 FT cycles, and their cell viability, leavening activity, growth kinetics, morphology, and transcriptome were examined. The results showed that the SCMH-added yeast had significantly higher cell viability (40.7%), leavening activity (473.2 mL·kg -1 ·h -1 ), and maximum specific growth rate (2.63 h -1 ) than those in control (CK) group (0%, 287.2 mL·kg -1 ·h -1 , and 1.74 h -1 , respectively), after 6 FT cycles. Frozen-thawed yeast with SCMH also exhibited better cell structural integrity compared to that of the CK yeast. Transcriptomic analysis revealed that the incorporation of SCMH led to significantly increased counts of differentially expressed genes (DEGs) in yeast cells after 6 FT cycles, and transcriptionally regulated the pathways associated with ribosome biogenesis and function, amino acid metabolism, carbohydrate metabolism, and lipid metabolism. Therefore, the SCMH could help yeast withstand FT stress, likely via a dual mechanism for inhibiting ice growth and inducing some freeze-adapted transcriptional regulation.
期刊：
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY D-GENOMICS & PROTEOMICS,2025年56:101620 ISSN：1744-117X
通讯作者：
Zhou, Yi
作者机构：
[He, Leli; Zhou, Yuling; Pi, Jiamin; Huo, Yang; Zhang, Yi; Zhao, Xiangyu; Qin, Weiling; Su, Jisen; He, Siyang; Zhong, Huan; Dai, Tao; Zhou, Xiaolong; Dong, Minglin] College of Life Sciences, Hunan Normal University, Changsha 410081, China;[Wang, Bohua; Lei, Song] College of Life and Environmental Sciences, Hunan University of Arts and Science, Changde 415000, China;[Li, Xianghong] Hunan Provincial Engineering Technology Research Center of Aquatic Food Resources Processing, School of Food Science and Bioengineering, Changsha University of Science and Technology, Changsha 410114, China;[Zhou, Yi] College of Life Sciences, Hunan Normal University, Changsha 410081, China. Electronic address: zhouyi_zy@hunnu.edu.cn
通讯机构：
[Yi Zhou] C;College of Life Sciences, Hunan Normal University, Changsha 410081, China
摘要：
Fish breeding, including distant hybridization and backcrossing, can reinforce fish growth performance and flesh quality. Using the intercrossing and backcrossing, two improved crucian carps, WR1 and WR2, were generated with a fast growth rate and high-quality flesh. The present study focused on the metabolomic profiles of two genetically improved fish species and investigated the mechanisms of advanced traits underlying metabolic changes by comparing them to their original parents. By comparing WR1 with its parents, 65 differentially expressed metabolites (DEMs) showed significantly higher expression levels in both parental species, whereas 281 DEMs exhibited significantly lower expression levels in both. Among them, LysoPC 18:3, deoxycholic acid, and uric acid were significantly higher, whereas inosine was significantly lower in WR1. In WR2, 75 metabolites were significantly higher in the parents than in WR2, while 413 metabolites were significantly lower in the parents than in WR2. l -Carnitine, creatine, choline, and seven di−/tripeptides were upregulated in WR2. The higher levels of creatine in the muscle of WR2 compared to WR1 and the Weighted Gene Co-expression Network Analysis (WGCNA) results suggest that creatine is the key node that regulates a module containing 72 metabolites. The concentration of creatine in WR2 reached to 28.58 ± 3.01 μmol/g indicating the high concentration of creatine in WR2 was related with its growth performance and high-quality flesh. In conclusion, this study provides the first clues for genetic breeding to reconstruct the metabolic profiles of crucian carp, implying a metabolic mechanism for reinforcing growth performance and flesh quality.
Fish breeding, including distant hybridization and backcrossing, can reinforce fish growth performance and flesh quality. Using the intercrossing and backcrossing, two improved crucian carps, WR1 and WR2, were generated with a fast growth rate and high-quality flesh. The present study focused on the metabolomic profiles of two genetically improved fish species and investigated the mechanisms of advanced traits underlying metabolic changes by comparing them to their original parents. By comparing WR1 with its parents, 65 differentially expressed metabolites (DEMs) showed significantly higher expression levels in both parental species, whereas 281 DEMs exhibited significantly lower expression levels in both. Among them, LysoPC 18:3, deoxycholic acid, and uric acid were significantly higher, whereas inosine was significantly lower in WR1. In WR2, 75 metabolites were significantly higher in the parents than in WR2, while 413 metabolites were significantly lower in the parents than in WR2. l -Carnitine, creatine, choline, and seven di−/tripeptides were upregulated in WR2. The higher levels of creatine in the muscle of WR2 compared to WR1 and the Weighted Gene Co-expression Network Analysis (WGCNA) results suggest that creatine is the key node that regulates a module containing 72 metabolites. The concentration of creatine in WR2 reached to 28.58 ± 3.01 μmol/g indicating the high concentration of creatine in WR2 was related with its growth performance and high-quality flesh. In conclusion, this study provides the first clues for genetic breeding to reconstruct the metabolic profiles of crucian carp, implying a metabolic mechanism for reinforcing growth performance and flesh quality.
摘要：
Aptamers have recently become novel probes for biosensors because of their good biocompatibility, strong specificity, and high sensitivity. Biosensors based on peptides or nucleic acid aptamers are used in implantable and wearable devices owing to their ease of synthesis and economic efficiency. Simultaneously, amphoteric ionic peptides are being explored as antifouling layers for biosensors resistant to interference from extraneous proteins in serum. Thus, this paper reviews recently developed aptamer-based biosensors and introduces peptide- and nucleic acid-based biosensors, while focusing on the three primary classes of biosensors: electrochemical sensors, fluorescent or colorimetric biosensors, and electroluminescent sensors. Furthermore, we summarize their general construction strategies, describe specific electrochemical sensors that use peptides as an antipollution layer, and elucidate their advantages.
摘要：
Mg-MOF-74 material with a hierarchical pore structure was successfully prepared by regulating the defects through propionic acid. The derived materials were analyzed with X-ray diffraction, scanning electron microscopy, FT-IR, X-ray photoelectron spectroscopy, thermogravimetry analysis, elemental analysis, and nitrogen adsorption. Results show that a low concentration of propionic acid (n DHTA :n PA = 2:1) introduces a mesoporous structure while maintaining the material's crystallinity. This modification significantly increased the specific surface area (from 243 m 2 /g to 684 m 2 /g) and CO 2 adsorption capacity (from 5.35 mmol/g to 5.76 mmol/g at 1 bar, 40 °C). Uncoordinated Mg 2+ sites generated by propionic acid enhanced the dipole-quadrupole interaction with CO 2 . Furthermore, the hierarchical pore structure reduces mass transfer resistance. This yields a 190 % improvement in high-pressure CO₂ adsorption capacity (at 15 bar) and increases CO₂/CH₄ selectivity by 288 %. However, excessive propionic acid (e.g., n DHTA : n PA = 2:1 for 5/PA3-Mg-MOF-74) caused partial framework collapse. This led to a 53 % decrease in specific surface area and reduced adsorption performance. This study proposes a one-step green synthesis strategy and optimizes MOF adsorption kinetics through defect engineering, providing new approaches for industrial CO 2 capture from flue gas and natural gas purification.
Mg-MOF-74 material with a hierarchical pore structure was successfully prepared by regulating the defects through propionic acid. The derived materials were analyzed with X-ray diffraction, scanning electron microscopy, FT-IR, X-ray photoelectron spectroscopy, thermogravimetry analysis, elemental analysis, and nitrogen adsorption. Results show that a low concentration of propionic acid (n DHTA :n PA = 2:1) introduces a mesoporous structure while maintaining the material's crystallinity. This modification significantly increased the specific surface area (from 243 m 2 /g to 684 m 2 /g) and CO 2 adsorption capacity (from 5.35 mmol/g to 5.76 mmol/g at 1 bar, 40 °C). Uncoordinated Mg 2+ sites generated by propionic acid enhanced the dipole-quadrupole interaction with CO 2 . Furthermore, the hierarchical pore structure reduces mass transfer resistance. This yields a 190 % improvement in high-pressure CO₂ adsorption capacity (at 15 bar) and increases CO₂/CH₄ selectivity by 288 %. However, excessive propionic acid (e.g., n DHTA : n PA = 2:1 for 5/PA3-Mg-MOF-74) caused partial framework collapse. This led to a 53 % decrease in specific surface area and reduced adsorption performance. This study proposes a one-step green synthesis strategy and optimizes MOF adsorption kinetics through defect engineering, providing new approaches for industrial CO 2 capture from flue gas and natural gas purification.
摘要：
This study investigated the effects of silver carp muscle hydrolysate (SCMH) on volatile odor characteristics in frozen dough (FD) and its derived products using electronic nose and gas chromatography-mass spectrometry (GC-MS) analyses. Results demonstrated that steamed bread (SB) prepared from SCMH-incorporated FD after six freeze-thaw cycles exhibited significantly improved specific volume, textural properties, and gas-cell structure compared to controls (p<0.05). GC-MS identified 29 volatile compounds in SCMH, predominantly 2,3-butanediol (32.05%) and 1-penten-3-ol (22.88%). SCMH addition altered the olfactory sense and volatile profiles of FD, yet introduced no undesirable fishy odor substances in the final SB. Moreover, the volatile compounds in dough and SB were mainly enriched during dough fermentation, while the key aroma components, such as 3-methyl-1-butanol, 3-methylthio-1-propanol, phenethyl alcohol, 3-hydroxy-2-butanone, and 2,3-butanediol, were enhanced by adding SCMH. These findings suggested that SCMH could effectively maintain the quality of FD without compromising its final product flavor, while potentially improving the aroma characteristics of SB, although the detailed mechanism remained to be further clarified.
摘要：
The limited gel-forming ability and poor storage stability of unwashed surimi hinder its large-scale industrial adoption, requiring targeted solutions. This study aimed to investigate the gel enhancement, antioxidant and cryoprotective effects of enzyme-assisted extracted surimi by-product proteins (EAE-SBPs) on unwashed surimi. The EAE-SBPs were characterized and then incorporated into surimi system to evaluate their influences on the quality of freeze-thaw (FT) treated raw surimi or surimi gel. The results revealed that EAE-SBPs exhibited triple cryoprotective activity (54.90 % yeast cell viability), antioxidant capacity (58.72 % DPPH radical scavenging rate), and gel-strengthening capability. Compared to controls, the raw surimi containing EAE-SBPs demonstrated significantly retarded reduction in protein Ca 2+ -ATPase activities, and mitigated increase in TBARS levels and protein carbonyl contents during FT process ( p < 0.05). After 6 FT cycles, a significantly higher ( p < 0.05) gel strength, water holding capacity, and structural integrity of gel network, as well as a more restricted water migration and ice crystal growth, were observed in the EAE-SBPs-added surimi gels than those in controls. These findings offer a knowledge on severing EAE-SBPs as a concurrent cryoprotectant, antioxidant and gel enhancer in unwashed surimi processing, ultimately contributing to the production of unwashed surimi with enhanced quality.
The limited gel-forming ability and poor storage stability of unwashed surimi hinder its large-scale industrial adoption, requiring targeted solutions. This study aimed to investigate the gel enhancement, antioxidant and cryoprotective effects of enzyme-assisted extracted surimi by-product proteins (EAE-SBPs) on unwashed surimi. The EAE-SBPs were characterized and then incorporated into surimi system to evaluate their influences on the quality of freeze-thaw (FT) treated raw surimi or surimi gel. The results revealed that EAE-SBPs exhibited triple cryoprotective activity (54.90 % yeast cell viability), antioxidant capacity (58.72 % DPPH radical scavenging rate), and gel-strengthening capability. Compared to controls, the raw surimi containing EAE-SBPs demonstrated significantly retarded reduction in protein Ca 2+ -ATPase activities, and mitigated increase in TBARS levels and protein carbonyl contents during FT process ( p < 0.05). After 6 FT cycles, a significantly higher ( p < 0.05) gel strength, water holding capacity, and structural integrity of gel network, as well as a more restricted water migration and ice crystal growth, were observed in the EAE-SBPs-added surimi gels than those in controls. These findings offer a knowledge on severing EAE-SBPs as a concurrent cryoprotectant, antioxidant and gel enhancer in unwashed surimi processing, ultimately contributing to the production of unwashed surimi with enhanced quality.
摘要：
Microplastics (MPs) have been demonstrated to pose significant health risks by investigations, thereby warranting an in-depth exploration of elimination techniques. In this research, TiO 2 nanoparticles were dispersed and fixed onto a chitin sponge matrix utilized the freeze–thaw method, fabricating a novel composite sponge. Analytical techniques such as XPS and SEM revealed that the TiO 2 nanoparticles were securely anchored onto the chitin network via van der Waals forces or hydrogen bonding. Notably, the distribution of TiO 2 on the chitin framework significantly influences its photocatalytic efficiency. Upon the dispersion of TiO 2 , there is an observed enhancement in photocatalytic capability towards polystyrene (PS) MPs. The TiO 2 /chitin composite sponge exhibited rapid and effective photocatalytic degradation efficiency, achieving 58.4 % within 6 h, and the degradation kinetics following a first-order reaction model. Furthermore, GC–MS and FTIR analyses conducted post-degradation of PS MPs uncovered the presence of three kinds of molecules containing carbonyl groups, with degradation yield of 3.26 %, 23.7 %, and 30.2 %, respectively. To summarize, this investigation introduces a approach leveraging TiO 2 /chitin composite sponge as a high-performance photocatalyst, providing valuable theoretical insights for the utilization of chitin-based composite sponges in the removal of microplastics.
Microplastics (MPs) have been demonstrated to pose significant health risks by investigations, thereby warranting an in-depth exploration of elimination techniques. In this research, TiO 2 nanoparticles were dispersed and fixed onto a chitin sponge matrix utilized the freeze–thaw method, fabricating a novel composite sponge. Analytical techniques such as XPS and SEM revealed that the TiO 2 nanoparticles were securely anchored onto the chitin network via van der Waals forces or hydrogen bonding. Notably, the distribution of TiO 2 on the chitin framework significantly influences its photocatalytic efficiency. Upon the dispersion of TiO 2 , there is an observed enhancement in photocatalytic capability towards polystyrene (PS) MPs. The TiO 2 /chitin composite sponge exhibited rapid and effective photocatalytic degradation efficiency, achieving 58.4 % within 6 h, and the degradation kinetics following a first-order reaction model. Furthermore, GC–MS and FTIR analyses conducted post-degradation of PS MPs uncovered the presence of three kinds of molecules containing carbonyl groups, with degradation yield of 3.26 %, 23.7 %, and 30.2 %, respectively. To summarize, this investigation introduces a approach leveraging TiO 2 /chitin composite sponge as a high-performance photocatalyst, providing valuable theoretical insights for the utilization of chitin-based composite sponges in the removal of microplastics.
摘要：
A series of dihydrazide compounds were synthesized and evaluated as nucleating agents (NAs) for isotactic polypropylene (iPP). The crystallization behavior of iPP was studied using differential scanning calorimetry (DSC) to investigate the influence of dihydrazide compounds featuring streptane and cycloalkane substituents with varying carbon chain lengths. The mechanical properties of iPP nucleated by highly efficient NAs were characterized. Internal crystallization was observed using polarized optical microscopy (POM). DSC results demonstrated that all synthesized compounds exhibited strong alpha-nucleating ability in iPP. Comparing phenylenedihydrazide and cyclohexanedihydrazide compounds with identical substituent carbon numbers, cycloalkane substituents were found to nucleate iPP more effectively than streptane substituents. Mechanical property tests demonstrated a significant increase in the rigidity of nucleated iPP without compromising its inherent toughness. POM analysis revealed that the addition of NAs accelerated nucleation kinetics, refined spherical crystal sizes, and expedited the crystallization process.
通讯机构：
[Li, W ; Dai, YM] C;Changsha Univ Sci & Technol, Sch Chem & Chem Engn, Hunan Prov Key Lab Mat Protect Elect Power & Trans, Hunan Prov Key Lab Cytochem, Changsha 410114, Peoples R China.
摘要：
The frequent leakage of crude oil and the illegal discharge of industrial organic pollutants have caused serious damage to the ecological environment and the loss of valuable resources. In this paper, we introduce a sponge with magnetic and photothermal properties. Polydopamine and ferric oxide (Fe3O4) were grafted onto the sponge, self-assembled on the three-dimensional (3D) skeleton surface by Zif material, and grafted with cetyltrimethoxysilane to make the modified sponge highly hydrophobic (water contact angle = 155 degrees). Moreover, due to the dual photothermal conversion properties of polydopamine and ferric oxide (Fe3O4), the modified sponge can be quickly heated to 110 degrees C under light (1.25 kw/m2). The modified sponge demonstrated excellent crude oil adsorption capacity (44 g/g) and recyclability. Due to its magnetic properties (saturated magnetization = 4.43 emu/g), derived from the incorporation of Fe3O4, the sponge could be remotely controlled for adsorption. Moreover, it demonstrated the ability to continuously adsorb and collect light oil from the water surface with the aid of a peristaltic pump. The sponge also functioned as an efficient filter for separating heavy oil underwater through liquid gravity, achieving a separation efficiency of 97.2%. Therefore, this composite sponge not only presents a promising solution for crude oil spill remediation but also holds significant potential for industrial wastewater treatment, making it highly relevant for practical environmental applications.
通讯机构：
[Dai, Z ] C;Changsha Univ Sci & Technol, Sch Chem & Chem Engn, Hunan Prov Key Lab Mat Protect Elect Power & Trans, Changsha 410114, Peoples R China.
摘要：
Supercapacitors have emerged as a popular area of research due to their exceptional attributes, including excellent cycling life, admirable power density, and rapid charge/discharge capabilities. However, the low energy density significantly restricts its range of applicable scenarios. Herein, the grafting copolymerization technique was employed to incorporate transition metals (nickel, cobalt) into the molecular chain of lignin, and lignin-based pseudocapacitor material (Ni/Co@LC) is obtained after thermal treatment. XRD, X-ray photoelectron spectroscopy, scanning electron microscopy, and energy dispersive spectrometry results demonstrate a strong interaction between Ni/Co and carbon, with the transition metals encapsulated within a carbon shell. Hence, the Ni/Co@LC exhibits an approximately 69% increase in specific capacitance compared with those conventional pseudocapacitor materials which Ni/Co coated on the surface of carbon materials, and the equivalent series resistance is reduced by about 50%. Moreover, the assembled asymmetric supercapacitors of Ni/Co@LC//LC achieve an energy density of 52.89 W h kg(-1) at a power density of 640 W kg(-1) and maintain a capacitance retention rate of 99.28% after undergoing 10,000 charge-discharge cycles. This work presents a novel approach for designing pseudocapacitor electrode materials with low impedance and high cycling performance.
摘要：
In this study, a porous magnetic CoFe 2 O 4-x /expanded graphite (CFE) composite catalyst based on the interlayer confinement strategy of expanded graphite was successfully constructed, and a high-density oxygen vacancy (OVs) system was successfully constructed through the unique spatial confinement effect. This synthesis strategy enables CFE materials to obtain enhanced surface area, accelerated electron transfer ability and abundant OVs, which jointly promote the significant enhancement of pollutant removal ability. The quasi first-order kinetic constant (0.50351 min −1 ) of CFE-20 composite was higher than that of pure CoFe 2 O 4 (0.00762 min −1 ). Under the conditions of low catalyst dosage (0.5 g L −1 ) and trace PMS activation (1 mmol L −1 ), the removal rate of 50 mg L −1 TC in 30 mins was 87.3 %. This study revealed the OVs mediated two-way activation mechanism, and the main active species were singlet oxygen ( 1 O 2 ) and superoxide radicals (•O 2 − ). It successfully broke through the bottleneck of the traditional PMS activation system sensitive to pH conditions, and maintained excellent degradation efficiency in the range of pH 3–11. Through HPLC-MS and Fukui function calculation, the degradation path of TC and the ecotoxicity evolution of its intermediate products were systematically clarified. In conclusion, CoFe 2 O 4-x /EG composite has excellent activation degradation and environmental protection performance, and has the potential to enhance the activated PMS wastewater treatment process, which provides further support for the application of advanced oxidation technology in wastewater treatment.
In this study, a porous magnetic CoFe 2 O 4-x /expanded graphite (CFE) composite catalyst based on the interlayer confinement strategy of expanded graphite was successfully constructed, and a high-density oxygen vacancy (OVs) system was successfully constructed through the unique spatial confinement effect. This synthesis strategy enables CFE materials to obtain enhanced surface area, accelerated electron transfer ability and abundant OVs, which jointly promote the significant enhancement of pollutant removal ability. The quasi first-order kinetic constant (0.50351 min −1 ) of CFE-20 composite was higher than that of pure CoFe 2 O 4 (0.00762 min −1 ). Under the conditions of low catalyst dosage (0.5 g L −1 ) and trace PMS activation (1 mmol L −1 ), the removal rate of 50 mg L −1 TC in 30 mins was 87.3 %. This study revealed the OVs mediated two-way activation mechanism, and the main active species were singlet oxygen ( 1 O 2 ) and superoxide radicals (•O 2 − ). It successfully broke through the bottleneck of the traditional PMS activation system sensitive to pH conditions, and maintained excellent degradation efficiency in the range of pH 3–11. Through HPLC-MS and Fukui function calculation, the degradation path of TC and the ecotoxicity evolution of its intermediate products were systematically clarified. In conclusion, CoFe 2 O 4-x /EG composite has excellent activation degradation and environmental protection performance, and has the potential to enhance the activated PMS wastewater treatment process, which provides further support for the application of advanced oxidation technology in wastewater treatment.
摘要：
Metal free carbon materials such as graphene, diamond, and carbon nanotubes are becoming alternative catalysts for peroxymonosulfate (PMS) activation to avoid drawbacks of traditional transition metal-containing catalysts, such as leaching of metal ions and harshing usage environments. However, these new catalysts have drawbacks such as complex processes and high synthesis costs. Herein, in this study, graphite with a unique "multilayer cake" structure was prepared as an efficient peroxymonosulfate (PMS) activator to degrade the antibiotic in the wastewater. Specifically, by optimizing the spacing between graphite layers, the expanded graphite (EG) exhibited exceptional performance, achieving over 80 % removal of tetracycline (TC) molecules within 15 mins. The enhancement of PMS activation ability is attributed to the enhanced electronic conductivity and adsorption capacity of EG. Notably, the electron-donating capability of EG facilitates a degradation mechanism dominated by singlet oxygen ( 1 O 2 ) rather than conventional free radicals (SO 4 •− , •OH), imparting the system with enhanced environmental adaptability. Furthermore, the facilitated electron transfer between pollutants and EG accelerates degradation. Compared with reported，The inherent hydrophobicity and excellent stability of graphite enable self-separation and reusability, ensuring cost-effectiveness and practicality. Collectively, this study highlights the promising application of the highly self-separating "multilayer cake" structured EG catalyst as a low-cost, high-efficiency PMS activator, offering valuable insights into the practical deployment of carbon-based materials in Fenton-like catalytic systems.
Metal free carbon materials such as graphene, diamond, and carbon nanotubes are becoming alternative catalysts for peroxymonosulfate (PMS) activation to avoid drawbacks of traditional transition metal-containing catalysts, such as leaching of metal ions and harshing usage environments. However, these new catalysts have drawbacks such as complex processes and high synthesis costs. Herein, in this study, graphite with a unique "multilayer cake" structure was prepared as an efficient peroxymonosulfate (PMS) activator to degrade the antibiotic in the wastewater. Specifically, by optimizing the spacing between graphite layers, the expanded graphite (EG) exhibited exceptional performance, achieving over 80 % removal of tetracycline (TC) molecules within 15 mins. The enhancement of PMS activation ability is attributed to the enhanced electronic conductivity and adsorption capacity of EG. Notably, the electron-donating capability of EG facilitates a degradation mechanism dominated by singlet oxygen ( 1 O 2 ) rather than conventional free radicals (SO 4 •− , •OH), imparting the system with enhanced environmental adaptability. Furthermore, the facilitated electron transfer between pollutants and EG accelerates degradation. Compared with reported，The inherent hydrophobicity and excellent stability of graphite enable self-separation and reusability, ensuring cost-effectiveness and practicality. Collectively, this study highlights the promising application of the highly self-separating "multilayer cake" structured EG catalyst as a low-cost, high-efficiency PMS activator, offering valuable insights into the practical deployment of carbon-based materials in Fenton-like catalytic systems.
