采用溶胶-凝胶法将Keggin型H4SiW12O40负载在SiO2上,并用30％H2O2溶液对其进行敏化,制得H4SiW12O40/SiO2/H2O2光催化剂,分别利用傅里叶变换红外光谱仪(FT-IR)、X射线衍射(XRD)对该光催化剂进行表征分析,结果表明H4SiW12O40高度分散在SiO2上,并且经过H2O2溶液处理的光催化剂在935.2 cm-1出现了一个较弱的过氧基吸收峰,这与过氧多酸化合物的吸收峰较一致.另外,进行甲基橙模拟废水溶液在黑暗条件下的吸附-脱附平衡实验,结果表明在30 min达到吸附-脱附平衡,故优化组实验选择在黑暗下搅拌30 min以达到吸附-脱附平衡.接着对甲基橙的初始浓度、溶液pH以及催化剂用量进行优化.实验发现,在甲基橙初始浓度为15 mg·L-1,溶液pH为1.0,催化剂的用量为6 g·L-1的优化情况下,光降解3.0h,甲基橙的降解率达到99.0％,H4SiW12O40/SiO2/H2O2光催化降解甲基橙溶液的过程符合一级动力学反应规律;且H4SiW12O40/SiO2/H2O2对甲基紫、孔雀石绿、亚甲基蓝、罗丹明B和甲基红均具有较高的光催化活性,降解率达87.5％～ 100.0％.
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