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采用溶胶凝胶法制备了Fe3+ V5+ TiO2 复合纳米微粒作为光催化剂。光降解反应结果表明 ,共掺杂催化剂Fe3+ V5+ TiO2 的光催化活性明显提高。光电化学研究显示 ,铁离子可以成为电荷陷阱 ,促进空穴的界面传递反应。适量钒离子掺杂使TiO2 电极的光电流升高 ,导带中电子浓度的增大 ,加快了界面的电子传递反应。共掺杂催化剂中 ,Fe3+ 、V5+ 分别提供了空穴与电子的陷阱 ,同时加快了电子与空穴的界面传递反应 ,从而更有效地提高光催化活性。双组份共掺杂为提高TiO2 光催化活性提供新的途径。
Fe3 + V5 + TiO2 nanoparticles were prepared as photocatalysts by sol-gel method. The result of photodegradation showed that the photocatalytic activity of co-doped Fe3 + V5 + TiO2 increased obviously. Photoelectrochemical studies show that iron ions can become charge traps and promote hole-level interface transfer reactions. The appropriate amount of vanadium ions doping photocatalyst TiO2 electrode current increases, the conduction band electron concentration increases, accelerating the interface electron transfer reaction. In the co-doped catalyst, Fe3 + and V5 + respectively provide traps for holes and electrons, and at the same time, the interfacial reaction between electrons and holes is accelerated, thereby improving the photocatalytic activity more effectively. Bicomponent codoped to provide a new way to improve the photocatalytic activity of TiO2.