采用氨浸法制备了不同Ag负载量的纳米Ag/ZnO光催化剂,并用X射线衍射、比表面积测定、 X射线光电子能谱和漫反射紫外-可见光谱测定了Ag/ZnO的晶型结构、比表面积、表面组成和光谱特征. 以壬基酚聚氧乙烯醚(NPE-10)为模型污染物,分别在紫外光和可见光照射下考察了纳米Ag/ZnO的光催化活性. 结果表明, Ag能成功地负载到ZnO表面,且随着Ag负载量的增加, ZnO的粒径逐渐增大,比表面积逐渐减小. 与纳米ZnO样品相比, Ag/ZnO中Ag 3d5/2 结合能减小,而Zn 2p和O 1s结合能增大, ZnO表面的羟基氧和吸附氧含量增加. 当Ag负载量大于0.5%时, Ag/ZnO样品的吸收光谱发生红移,在可见光区出现吸收. 光催化降解结果表明, 0.5%Ag/ZnO样品的光催化活性最高,在紫外光和可见光照射3 h后NPE-10降解率分别约为77%和56%, 而ZnO样品的光催化活性仅约为61%和40%.
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