介孔SO_4^(2-)/W-TiO_2@SiO_2可见光催化剂的制备及催化性能  

Preparation and photocatalytic properties of mesoporous SO_4^(2-)/W-TiO_2@SiO_2 visible light photocatalysts

作　　者：占昌朝[1,2] 钟明强[1] 陈枫[1] 杨晋涛[1] 曹小华[1,2] 张旭[2] 刘涛[2] 

机构地区：[1]浙江工业大学化学工程与材料学院,杭州310014 [2]九江学院化学与环境工程学院,九江332005

出　　处：《中国有色金属学报》2014年第1期211-220,共10页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(21274131;51203139;51273178;21161009);江西省自然科学基金资助项目(20132BAB203023;20132BAB203004);江西省教育厅科技基金资助项目(GJJ13723);浙江省重中之重学科开放基金资助项目(20121137)

摘　　要：以P123作为模板剂,采用溶胶-凝胶法合成介孔SO42-/W-TiO2@SiO2(WSTS)可见光响应光催化剂。以甲基橙为模型物,考察其在可见光及紫外光区的光催化活性。采用X射线衍射(XRD)、环境扫描电子显微镜(SEM)、高分辨透射电子显微镜(HRTEM)、X射线光电子能谱(XPS)、低温氮物理吸附(BET)、紫外-可见漫反射光谱(UV-Vis)、傅里叶变换红外光谱(FTIR)、热重分析(TG)和荧光光谱(PL)对样品的结构及性能进行表征。结果表明:W掺杂不但可以提高样品的比表面积、孔容,而且可以抑制晶型从锐钛矿向金红石转变。与光催化剂P25及未掺杂的样品相比,光催化活性明显提高。且W的最佳掺杂量为n(W)/n(Ti)=0.002 5,其在可见光(λ>400 nm)和紫外光区辐照40 h和60 min后,甲基橙的脱色率分别是91.7%和98.9%。The mesoporous SO42-/W-TiO2@SiO2 visible light photocatalysts were synthesized by sol-gel method using P123 as template. The photocatalytic activity of the prepared mesoporous SO42-/W-TiO2@SiO2（WSTS） for methyl orange was investigated under visible and UV light irradiation, respectively. The textural properties and structure of samples were characterized by X-ray diffraction （XRD）, environmental scanning electron microscope （SEM）, high-resolution transmission electron micro-scope （HRTEM）, X-ray photoelectron spectroscopy （XPS）, N2 adsorption-desorption measurements （BET）, Fourier transform infrared spectroscopy （FTIR）, UV-Vis diffuse reflectance spectroscopy, thermogravimetric analysis （TGA） and photoluminescence spectra （PL）. The results show that the W doping not only increases the surface area and pore volume of sulfated mesoporous TiO2@SiO2, but also inhibits the phase transition from anatase to rutile. The photo-degradation results reveal that W doping can greatly improve the photocatalytic activity of sulfated TiO2@SiO2 with mesostructure, which is higher than that of undoped samples and the commercially available Degussa P25 titanium dioxide by degradation of methyl orange （MO） aqueous solutions. The optimal W doping is n（W）/n（Ti）=0.002 5 （mole fraction）, the alloy expresses higher photocatalytic activity, the discoloration rates are 91.7%and 98.9%under visible light （λ＆gt;400 nm） for 40 h and UV light for 60 min, respectively.

关 键 词：溶胶-凝胶法 SO42- W-TiO2SiO2 介孔 可见光催化 SO42- W-TiO2SiO2 

分 类 号：O643[理学—物理化学]