钒掺杂介孔二氧化钛的制备及可见光催化性能  

Preparation and Visible-light Photocatalytic Performance of Mesoporous Vanadium-doped Titania

作　　者：徐鹏[1] 李佑稷[1] 刘晨[1] 李铭[1] 邓瑞成 

机构地区：[1]吉首大学化学化工学院,吉首416000

出　　处：《高等学校化学学报》2014年第9期1954-1961,共8页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:51172092);教育部新世纪优秀人才支撑计划(批准号:NCET-12-0720);湖南省自然科学杰出青年基金(批准号:13JJ1023);吉首大学研究生项目(批准号:13JDY027);湖南省高校科技创新团队支持计划资助~~

摘　　要：以表面活性剂十六烷基三甲基溴化铵(CTAB)为模板,钛酸四正丁酯为钛源,偏钒酸铵为掺杂离子前驱体,通过液晶模板辅助溶胶-凝胶法制备钒掺杂介孔TiO2(VMT),采用X射线衍射(XRD)、N2吸附-脱附分析、热重-差热分析(TG-DTA)、X射线光电子能谱(XPS)、紫外-可见光谱(UV-Vis)和透射电子显微镜(TEM)等对样品结构进行表征,选择亚甲基蓝为目标降解物,对VMT的可见光催化性能进行了研究.结果表明,钒掺杂减小了介孔TiO2(MT)的粒径和光生电子-空穴复合率,增大了比表面积及Ti3+和羟基浓度,导致VMT比纯MT和P25光催化活性高,并且钒掺杂使MT带隙能降低,使其具有很高的可见光催化活性.最佳的光催化条件为:VMT的浓度为0.83 g/L,MB的浓度为1 mg/L.Based on employing the liquid crystal of surfactant cetyltrimethyl ammonium bromide （ CTAB ） , tetrabutyl titanate and ammonium metavanadate as template, titanium source and doping-ion precursor, respectively, vanadium-doped mesoporous titanium dioxide （ VMT ） was obtained by sol-gel method. The structure of obtained sample was characterized via X-ray diffraction（XRD）, nitrogen adsorption-desorption, thermogravimetry-differential thermal analysis （ TG-DTA ） , X-ray photoelectron spectroscopy （ XPS ） , UV-Visible diffuse reflection spectrometry（ UV-Vis） and transmission electronic microscopy（ TEM） . Choosing methylene blue（ MB） as the target degradation product, the photocatalytic performance of VMT was discussed under visible light irradiation. The results show that doping vanadium can reduce TiO2 particle size, inhibit photo-electron and hole recombination rate as well as increase specific surface area and the concentration of titanium ion and hydroxyl. Thus VMT exhibits the highest catalytic activity among pure MT, VMT and P25 under UV-light irradiation. In addition, doping vanadium can also lessen MT band-gap energy and improve its catalytic activity under visible light. The optimal photocatalytic condition is as follows： catalyst concentration of 0. 83 g/L and MB concentration of 1 mg/L.

关 键 词：溶胶-凝胶法 掺钒二氧化钛 介孔材料 亚甲基蓝 光催化性能 

分 类 号：O643[理学—物理化学]