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新型可见光活性W掺杂LiInO2光催化剂的制备及光催化性能
作者:黄锻1 2 张世英1 2 张向超2 许第发2 许凯强1 
单位:1. 湖南大学 材料科学与工程学院 长沙 410082 2. 长沙学院 生物工程与环境科学系 长沙 410003 
关键词:偏铟酸锂 钨掺杂 溶胶–凝胶法 可见光 
分类号:TQ124.4
出版年,卷(期):页码:2016,44(7):1019-1024
DOI:
摘要:

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LiInO2(W:LiInO2)光催化剂,研究不同W掺杂量对W:LiInO2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,W6+成功进入了LiInO2晶格并部分取代了In3+,从而导致W:LiInO2的光吸收边产生了明显的红移,禁带宽度由3.6 eV降至3.3 eV。当W掺杂量为6%(摩尔分数)时,W:LiInO2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LiInO2样品的57%。W:LiInO2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。
 

To improve the visible-light photocatalytic activity of the novel LiInO2 photocatalyst, element W, which has a similar ionic radius to element In, is used to prepare W-doped LiInO2 (W:LiInO2) by a sol-gel method. Effect of mole fraction of W-doped on photocatalytic activity of the W:LiInO2 sample. The results indicate that the W6+ ion successfully inserts into the lattice of LiInO2 and partially replaces the In3+ ion creating W:LiInO2, resulting in an obvious red shift on the absorption edge and a narrow band gap from 3.6 to 3.3 eV. Furthermore, the 6%W:LiInO2 exhibits the optimum photocatalytic activity toward methylene blue(MB) degradation under visible light irradiation (λ>420 nm). The 6%W:LiInO2 shows 100% MB degradation within 90 min, which is greater than that of pure LiInO2 (57%) under the same conditions. The enhanced photocatalytic activity of W:LiInO2 can be attributed to the improved light absorption and the promoted photogenerated electron-hole pair separation in the case of W6+ ion doping into LiInO2. It is indicated that a novel photocatalyst with an excellent visible-light response could be prepared.
 

基金项目:
国家自然科学基金(51272032)。
作者简介:
黄 锻(1990—),男,硕士研究生。
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