采用超声辅助沉淀-沉积及光致还原法制备可见光响应的Ag@AgBrH2WO4异质结型光催化剂.采用X射线粉末衍射、扫描电镜和紫外-可见漫反射光谱对其进行表征.以盐酸莫西沙星为模型污染物,对该催化剂在可见光(λ＞420 nm)下的催化活性和稳定性进行了评价,并分别以KI、甲醇、碳酸氢钠为空穴和自由基捕获剂研究了Ag@AgBrH2WO4的光催化反应机理.实验结果表明异质结型Ag@AgBrH2WO4光催化剂在可见光下光照20 min时对盐酸莫西沙星的降解率高达94.8％,样品经4次循环使用后催化活性基本保持不变.催化机理研究表明空穴和·O2-是光催化反应中主要的氧化性物质.
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