摘要
采用氨浸法制备了不同Fe3+含量的Fe3+/ZnO光催化剂,并用X射线衍射、N2吸附、X射线光电子能谱和紫外-可见漫反射光谱对纳米Fe3+/ZnO进行了表征.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下考察了纳米Fe3+/ZnO的光催化活性.结果表明,该方法能成功地将Fe掺杂到ZnO晶体上,且随着Fe3+添加量的增加,ZnO的晶粒尺寸逐渐减小,比表面积逐渐增大.与纳米ZnO样品相比,Fe3+/ZnO中Fe2p结合能减小,而Zn2p和O1s结合能增大,ZnO表面的羟基氧和吸附氧含量增加,光催化活性提高.当Fe3+的添加量大于0.5%时,Fe3+/ZnO样品的吸收光谱发生红移,在可见光区出现吸收.光催化降解结果显示,0.5%Fe3+/ZnO样品的光催化活性最高,在紫外光和可见光照射3h后对NPE-10的降解率分别比纯ZnO提高18%和69%.
Fe3^＋ -modified ZnO samples with different method. The crystal structure, specific surface area, amounts of Fe were prepared by the ammonia immersion atomic states on surface, and spectral characteristics were analyzed by X-ray diffraction, N2 adsorption, X-ray photoelectron spectroscopy, and diffuse reflectance ultraviolet-visible spectroscopy, respectively. The photocatalytic activity of Fe^3＋/ZnO samples for degradation of nonylphenol ethoxylate-10 （NPE-10） was studied under the irradiation with ultraviolet and visible light. The results showed that Fe could be successfully doped on the nano-ZnO crystal. The particle size of Fe^3＋/ZnO decreased and its specific surface area increased with the increase in doping Fe^3＋ Compared with the nano-ZnO, the binding energy of Fe 2p in Fe^3＋/ZnO dropped, but the binding energy of Zn 2p and O ls increased. The content of adsorbed O and hydroxy O on the surface of Fe^3＋/ZnO increased remarkably in contrast to that of the pure ZnO sample. The 0.5 % Fe^3＋/ZnO exhibited a red shift in the absorption spectrum. The photocatalytic activity of the 0.5% Fe^3＋/ZnO sample was highest, and the extra 18% and 69% degradation rate of NPE-10 could be found under 3 h irradiation of ultraviolet and visible light, respectively.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2007年第6期561-566,共6页
基金
山西省国际合作项目(051012).
关键词
铁
氧化锌
可见光
紫外光
光催化降解
壬基酚聚氧乙烯醚
表面活性剂
iron
zinc oxide
visible light
ultraviolet light
photodegradation
nonylphenol ethoxylate-10
surfactant
