摘要：
The inhibiting behavior of 1-ethyl-3-butylbenzotriazolium ionic liquids，[C2Bt][Br] ,on mild steel corrosion in 5 wt.% HCl as corroding solution was investigated using weight loss，potentiodynamic polarization and electrochemical impedance measurements. The obtained results indicated that [C2Bt][Br] is a good inhibitor for the mild steel in 5 wt.% HCl solution. The inhibition efficiency increased with an increase of inhibitive concentration. Potentiodynamic polarization data indicated that the [C2Bt][Br] acted essentially as a mixed-type inhibitor. The electrochemical impedance study showed that corrosion inhibition took place by adsorption.
摘要：
The nano-TiO2 photocatalysts which loaded on hollow float beads were prepared by sol-gel process. The hollow float beads as carrier was modified by H2SO4 and the TiO2 sol was obtained by tetrabutyl titanate, the modified hollow float beads was added into TiO2 sot, the TiO2 gel was obtained, then calcined at 450 degrees C, 500 degrees C, 550 degrees C respectively and obtained as-produced samples. Their property were characterized by TGA, XRD and SEM, Their photoactivity was evaluated by the photodegradation of the trace oil from fossil-fired power plant condensate under a series of temperature (15 degrees C similar to 45 degrees C), pH value (2 similar to 14), initial oil concentration (5mg/L) and catalysts dosage (2.500g/L, 4.000g/L, 5.000g/L, 6.000g/L, 7.500g/L, 10.000g/L), the experimental results showed that as temperature at 35 degrees C, pH value at 10, catalysts dosage at 5.000g/L and calcined temperature at 500 degrees C, the trace oil degradation rate could exceed 90% in 12 h, the catalysts could provided a efficient method to degradate the trace oil.
摘要：
Gd/N codoped nano-TiO2 photocatalyst were synthesized by a sol–gel method and characterized by various analytical methods, such as TEM, XRD and UV–vis–DRS. The photocatalytic activity was evaluated by the photodegradation of Humic Acids (HA) in an aqueous solution under the ultraviolet irradiation. The experiment results showed that as-produced samples had higher photodegradation for HA than that of P25, N doped nano-TiO2, and Gd doped nano-TiO2. Gd nanoparticles doped on the surface act as electron traps, enhancing the separation of electron-hole pairs, N atoms doped in TiO2 narrow the band gap, Gd/N codoped TiO2 nanopowders benefit from both of the effects.
作者机构：
[周艺; 黄可龙; 朱志平] College of Chemistry and Chemical Engineering, Central-South Univ., Changsha 410081, China;[周艺; 杨波; 朱志平] College of Chemistry and Environmental Engineering, Changsha Univ. of Science and Technology, Changsha 410077, China
通讯机构：
College of Chemistry and Chemical Engineering, Central-South Univ., China
通讯机构：
[Zhou Yi] C;Cent S Univ, Sch Chem & Chem Engn, Changsha 410083, Peoples R China.
会议名称：
2007年国际有色金属大会(International Conference of Nonfereous Materials '2007)(ICNFM)
会议时间：
2007-11-28
会议地点：
长沙
会议论文集名称：
2007年国际有色金属大会（International Conference of Nonfereo
关键词：
titania catalysts;codoping;synergetic effect
摘要：
Eu2+/Gd3+-codoped nanocrystalline titania catalysts were prepared by a modified sol-gel method. Powder X-ray diffraction,Transmission electron microscopy and UV-Vis spectra analyse were carried out to characterize the catalysts with different Eu2+/Gd3+contents.The photocatalytic efficiency was evaluated by the photodegradation of methyl orange in an aqueous solution under natural light irradiation. It has been confirmed that Eu2+/Gd3+-codoped titania could be excited by natural light. The higher natural light activity is due to the codoping of Eu2+/Gd3+. An optimum synergetic effect was found for a mass ratio of Eu/TiO2 equal to 1.0% and Gd/TiO2 equal to 0.5%. The effects induced by Eu2+/Gd3+-codoped on the titania catalysts may be explained in terms of Gd3+→Eu2+ energy transfer to affect the photocatalysis activity of the titania catalysts.
摘要：
A new type of photocatalysts MWCNTs/TiO2-NTs nanocomposites prepared by combining multi-walled carbon nanotube （MWCNTs） with TiO2-derived nanotubes were synthesized by a modified hydrotherrnal method. The SEM, XRD, UV-Vis and TG-DTG were used to characterize its property. The produced MWCNTs/TiO2-NTs nanocomposites were used as the catalysts for photo-degradation of aquatic humic substances, Their photocatalytic efficiency was evaluated by the photodegradation of humic acid in an aqueous solution under ultraviolet light irradiation. The results show MWCNTs could enhance the activity of the photocatalysts; the best degradation efficiency was obtained by using MWCNTs/TiO2-NTs nanocomposites containing 20% MWCNTs as the photo-catalyst.
摘要：
In order to realize the photocatalysis of TiO<inf>2</inf> in the sunlight and directly apply it to wastewater treatment, the Gd-doped TiO<inf>2</inf> nanofiber was synthesized using two-step synthesis method. Firstly, potassium carbonate, titanium dioxide and proper gadolinium oxide (dopant) were calcined in the muffle at high temperature and the doped gadolinium K<inf>2</inf>Ti<inf>4</inf>O<inf>9</inf> fibers were obtained;secondly, the fiber was heated using glycerol as solvent until Gd-doped TiO<inf>2</inf> nanofibers were obtained. The synthesized samples were characterized by scanning electron microscopy, transmission electron microscopy and X-ray diffraction. The results show that Gd-doped TiO<inf>2</inf> nanofiber heat-treated by glycerol solvent can inhibit the agglomeration, so the grain diameter of the fiber is smaller than that without heat-treated with glycerol. Meanwhile, the diameter of the fiber decreases with the increase of heating temperature and time. 97%-98% of Gd-doped TiO<inf>2</inf> nanofiber is anatase. The photocatalysis results showed that the photocatalysis activity of Gd-doped TiO<inf>2</inf> nanofiber is just a little lower than that of TiO<inf>2</inf> powder.
