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选用与In元素离子半径相近的W为掺杂元素,采用溶胶–凝胶法制备了W掺杂的Li In O_2(W:Li In O_2)光催化剂,研究不同W掺杂量对W:Li In O_2样品光催化活性的影响,并探索其增强的可见光催化机理。结果表明:W~(6+)成功进入了Li In O_2晶格并部分取代了In~(3+),导致W:Li In O_2的光吸收边产生了明显的红移,禁带宽度由3.6 e V降至3.3 e V。当W掺杂量为6%(摩尔分数)时,W:Li In O_2表现出最高的可见光(λ>420 nm)光催化降解亚甲基蓝染料的活性,其降解率在90 min内达到了100%,远高于纯Li In O_2样品的57%。W:Li In O_2增强的可见光催化活性主要归因于W掺杂提高了催化剂对光的利用率以及促进了光生电子–空穴对的有效分离。
W doped Li In O 2 (W: Li In O 2) photocatalysts were prepared by the sol-gel method using W as the doping element with the same ion radius as the In element. The effects of W doping on the W: Li In O 2 photocatalytic activity of the sample, and explore its enhanced visible light catalytic mechanism. The results show that W 6+ successfully enters the Li In O 2 lattice and partially substitutes In 3+, resulting in a significant red shift of the light absorption edge of W: Li In O 2. The band gap is 3.6 e V drops to 3.3 e V. W: Li In O 2 showed the highest photocatalytic degradation of methylene blue dye at visible light (λ> 420 nm) when the W doping amount was 6% (mole fraction), and its degradation rate reached 100% within 90 min. Far higher than 57% of pure Li In O 2 samples. W: Li In O 2 enhanced visible light catalytic activity is mainly attributed to W doping to improve the catalyst utilization of light and to promote the effective separation of photogenerated electron-hole pairs.