采用光还原沉积贵金属法,制备了Ag/TiO2复合纳米催化剂. 通过调节溶液的pH值控制TiO2表面负载银的形貌,利用AAS,XRD,TEM和XPS等手段对样品进行了表征. 以苯胺氧化为模型反应,考察了Ag/TiO2复合纳米催化剂样品的光催化活性以及银沉积量和沉积形貌对催化剂活性的影响. 结果表明,通过调控光还原沉积条件,可在平均粒径为24 nm左右的TiO2颗粒上获得3 nm左右均匀分散的银粒子; 在TiO2上沉积适量的具有较高分散度的金属Ag,能有效提高TiO2对苯胺氧化反应的光催化活性.
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