催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (5): 457-462.

• 研究论文 • 上一篇    下一篇

纳米Ag/ZnO光催化剂及其催化降解壬基酚聚氧乙烯醚性能

张靖峰,杜志平,赵永红,台秀梅   

  1. 中国日用化学工业研究院山西纳米技术应用研究中心, 山西太原 030001
  • 收稿日期:2007-05-25 出版日期:2007-05-25 发布日期:2011-04-28

Nano-Ag/ZnO Photocatalyst and Its Catalytic Performance for Degradation of Nonylphenol Ethoxylate-10

ZHANG Jingfeng, DU Zhiping*, ZHAO Yonghong, TAI Xiumei   

  1. Nanotechnology Applied Research Center of Shanxi Province, China Research Institute of Daily Chemical Industry, Taiyuan 030001, Shanxi, China
  • Received:2007-05-25 Online:2007-05-25 Published:2011-04-28

PDF

1100

被引次数

75

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%.

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

Abstract: 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 byX-raydiffraction, N2 adsorption,X-rayphotoelectron spectroscopy, and diffuse reflectance ultraviolet-visible 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 3d5/2in Ag/ZnO dropped, but the binding energy of Zn 2p and O 1s 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.

Key words: silver, zinc oxide, ultraviolet light, visible light, photocatalysis, degradation, nonylphenol ethoxylate-10, surfactant