以钛酸四丁酯为前驱物,无水乙醇为溶剂,聚乙二醇200为分散剂,三乙醇胺为抑制剂,采用溶胶-凝胶法制备了锐钛矿型硫镧共掺杂纳米TiO2(S-La-TiO2),通过透射电镜(TEM)、X射线衍射(XRD)、紫外-可见光谱(UV-Vis)等对材料的结构形貌进行了表征分析.并以甲醛作为目标污染物,研究了材料在不同光源照射条件下对甲醛的催化降解性能与机理.实验结果表明,S与La共掺杂提高了纳米TiO2在紫外光和可见光照射下的光催化活性,所制备的S-La-TiO2是一种性能良好的甲醛降解材料.在La的含量一定时,随S含量增加,材料对甲醛的降解率先增大后减小,当样品中各元素物质的量之比n(S):n(La):n(Ti)为1:0.01:1时的降解效果最好.
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