不同阴离子插层锌铝水滑石对亚甲基蓝的光催化性能（英文）

Photocatalytic Degradation of Methylene Blue by ZnA l Layered Double Hydroxides Intercalated with Different Anions

采用共沉淀法制备了不同阴离子(硝酸根、氯离子、碳酸根)插层的锌铝水滑石(LDHs),将其作为光催化剂用于可见光催化降解亚甲基蓝(MB)。通过X射线粉末衍射、Fourier红外光谱、热重质谱和紫外–可见漫反射光谱等技术对催化剂的结构和性质进行表征。结果表明:不同阴离子插层的水滑石对MB表现出了不同的光催化活性,其中,碳酸根插层的锌铝水滑石具有较高的光催化活性;在可见光照射180 min后,水滑石材料对MB的降解率从高到低依次为:ZnAl-CO_3 LDHs(95%)、ZnAl-Cl LDHs(70%)、ZnAl-NO_3 LDHs(62%)。此外,进一步探讨了不同阴离子插层的锌铝水滑石可见光催化降解MB的动力学参数和可能的光催化路径。

ZnAl layered double hydroxides （LDHs） intercalated with different anions （i.e., nitrate, chloride and carbonate） were synthesized by a coprecipitation method. The LDH catalysts were characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetry-mass spectroscopy and ultraviolet-visible diffuse reflectance spectroscopy, respectively. In addition, the photocatalytic degradation properties for methylene blue （MB） by these LDH materials under visible light were also investigated. The results show that LDH samples intercalated with different anions show different photodegradation efficiency for MB and ZnAl-LDHs intercalated with carbonate and exhibits the maximum catalytic activity. The removal rates of MB under irradiation of a visible lamp for 180 min are 95% for ZnAl-CO3 LDHs, 70% for ZnAl-CI LDHs and 62% for ZnAI-NO3 LDHs, respectively. Moreover, the kinetic parameters and possible photocatalytic pathways for MB decomposition by the ZnAI-LDHs intercalated with different anions were also analyzed.