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采用溶胶-凝胶法制备了Zr离子掺杂TiO2光催化剂.光催化降解对氯苯酚实验表明,Zr离子掺杂浓度为10%时活性最高,其紫外光、可见光催化活性分别是纯TiO2的1.5和4倍.利用XRD,XPS,UV-Vis漫反射吸收谱(diffuse reflectance absorption spectra),光致发光谱(photoluminescence)等技术对样品进行了表征,结果表明:Zr离子以取代式掺杂方式进入TiO2晶格,在TiO2导带下方形成掺杂能级,增强了可见光响应,促进了光生载流子的分离,此外Zr离子掺杂在催化剂表面引入大量表面缺陷,增加了表面羟基物种,从而使得Zr离子掺杂TiO2光催化剂的紫外、可见光催化活性显著提高.
Zr-doped TiO2 photocatalysts were prepared by sol-gel method.The photocatalytic degradation of p-chlorophenol showed that the highest photocatalytic activity was obtained when the doping concentration of Zr ions was 10% and the UV and visible photocatalytic activities were 1.5 And 4 times respectively.The samples were characterized by XRD, XPS, diffuse reflectance absorption spectra and photoluminescence.The results show that the Zr ions enter the substitutional doping mode TiO2 lattice forms a doping level below the conduction band of TiO2 and enhances the visible light response and promotes the separation of photogenerated carriers. In addition, Zr ion doping introduces a large number of surface defects on the surface of the catalyst to increase the surface hydroxyl species, Zr-doped TiO2 photocatalyst UV, visible light catalytic activity increased significantly.