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 ...