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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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采用溶胶-凝胶-溶剂热路径合成H3PW12O40/TiO2和H4SiW12O40/TiO2及其光催化降解二硝基甲苯
DOI: 10.1016/S1872-2067(12)60736-0, PP. 168-174
Keywords: 介孔材料,多金属氧酸盐,二氧化钛,结构导向剂,二硝基甲苯,光催化降解
Abstract:
？以非离子表面活性剂P123为结构导向剂，采用溶胶-凝胶与溶解热相结合方法，制备了两类介孔材料H3PW12O40/TiO2和H4SiW12O40/TiO2，并对其进行了表征.?X射线粉末衍射和拉曼光谱分析表明，所制催化剂为锐钛矿晶型，体系中H3PW12O40和H4SiW12O40的Keggin结构经400?℃焙烧后仍保持完整.?H3PW12O40/TiO2和H4SiW12O40/TiO2的平均粒径分别为15.49和7.75?nm.?N2吸附-脱附和扫描电镜结果表明，P123的加入使催化剂的粒径减小，比表面积和孔体积明显增大，其中H3PW12O40/TiO2和H4SiW12O40/TiO2的比表面积分别高达252.2和250.0?m2/g.?紫外漫反射吸收光谱表明，与纯TiO2相比，复合催化剂的吸收光谱发生了明显的红移，且吸收强度明显增大.?催化剂对DNT降解实验表明，在最佳操作条件下降解率可高达95%.?
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