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采用电沉积方法制备了H3PW12O40(PW12)-TiO2复合膜,通过SEM,EDX和XRD等手段,对其组成和结构进行了表征,并考察了该复合膜催化剂对降解甲基橙的催化活性.实验结果表明PW12存在于TiO2纳米管结构中,用PW12多酸修饰的TiO2纳米管比单独的TiO2纳米管展示出更好的光催化性能,由于电子能够从TiO2纳米管导带转移到多酸的LUMO能级,有效抑制了光生电子和空穴的复合,因而使PW12-TiO2复合膜表现出更高的光催化活性.
The composition and structure of H3PW12O40 (PW12) -TiO2 composite films were prepared by electrodeposition method and characterized by SEM, EDX and XRD, and the catalytic activity of the composite film catalysts for degradation of methyl orange was also investigated. The results show that PW12 exists in the structure of TiO2 nanotubes. TiO2 nanotubes modified with PW12 have better photocatalytic activity than TiO2 nanotubes alone. Since electrons can transfer from TiO2 nanotubes to polyacid LUMO The energy level effectively inhibited the recombination of photogenerated electrons and holes, thus the PW12-TiO2 composite film showed higher photocatalytic activity.