硫掺杂纳米TiO_2的掺杂机理及可见光催化活性的研究  

Doping Mechanism and Visible-light Photocatalytic Activity of S-doped TiO_2 Nano Powders

作　　者：周武艺[1] 曹庆云[2] 唐绍裘[3] 刘英菊[1] 

机构地区：[1]华南农业大学理学院应用化学系,广州510642 [2]华南农业大学动科院实验中心,广州510642 [3]湖南大学材料科学与工程学院,长沙410082

出　　处：《无机材料学报》2006年第4期776-782,共7页Journal of Inorganic Materials

基　　金：华南农业大学博士启动基金(4900-K06128)

摘　　要：用酸催化溶胶-凝胶技术合成了硫掺杂纳米TiO2光催化剂粉末．光催化降解亚甲基蓝实验结果表明,当硫脲与钛酸丁酯摩尔比S／Ti为3．5时,经500℃热处理后的催化剂的光催化活性最佳．通过XRD、DRS和XPS等研究表明硫掺杂导致二氧化钛晶粒尺寸细化,并有效地抑制了相变温度．在热处理过程中硫由S2-被氧化为S4+并进入到二氧化钛的晶格中取代了部分Ti4+位,导致了晶格的畸变,带隙变窄,从而导致对光的吸收发生了向可见光区移动．S-doped TiO2 nanopowders were prepared by a sol-gel method with acid as the catalyst. The results of photocatalytic degradation methylene blue demonstrated that the doped TiO2 exhibited the highest photocatalytic activity when the mole ratio of thiourea and tetrabutyltitanate[Ti- （OC4H9）4] was 3.5 and the doped TiO2 was calcined at 500℃ for 2h. The results from the X- ray diffraction （XRD）, diffusion reflectance spectra （DRS） and X ray photoelectron spectroscopy （XPS） showed that sulfur doping controlled the increasing of nano TiO2 and restrained the transformation from anatase to rutile. S^2- was oxidezed to S^4＋ during the thermal treatment. The trance of sulfur ions （S^4＋） substitued partially for the lattice titanium ions （Ti^4＋）, which resulted in the localized crystal deformation of TiO2 and the bandgap between valence band and conduction band narrowed, and the absorption light transferred to visible light region.

关 键 词：纳米TIO2 硫掺杂 机理 可见光催化降解 

分 类 号：TF123[冶金工程—粉末冶金]