摘要
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%.
Ag-modified nano-ZnO samples with different Ag loadings were prepared by the ammonia immersion method. The crystal structure, specific surface area, surface composition, and spectral characteristics were analyzed by X-ray diffraction, N2 adsorption, X-ray photoelectron spectroscopy, and diffuse reflectance ultravioletvisible spectroscopy, respectively. The photocatalytic activity of Ag/ZnO samples for degradation of nonylphenol ethoxylate-10 （NPE-10） was studied under the irradiation with ultraviolet light and visible light. The results showed that Ag could be successfully supported on the nano-ZnO surface. The particle size of Ag/ZnO increased and its specific surface area decreased with the increase of Ag loading. Compared with the nano-ZnO, the binding energy of Ag 3d5/2 in Ag/ZnO dropped, but the binding energy of Zn 2p and O ls increased. The contents of adsorbed oxygen and hydroxy oxygen on the Ag/ZnO surface increased remarkably in contrast to that of the pure ZnO sample. The 0.5 % Ag/ZnO exhibited a red shift in the absorption spectrum. The photocatalytic activity of the 0.5%Ag/ZnO sample was the highest, and the degradation rate of NPE-10 was 77% and 56% under 3 h irradiation of ultraviolet light and visible light, respectively.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2007年第5期457-462,共6页
基金
山西省国际合作项目(051012).
关键词
银
氧化锌
紫外光
可见光
光催化
降解
壬基酚聚氧乙烯醚
表面活性剂
silver
zinc oxide
ultraviolet light
visible light
photocatalysis
degradation
nonylphenol ethoxylate-10
surfactant
