(1. 浙江工業(yè)大學(xué) 化學(xué)工程與材料學(xué)院，杭州 310014；
2. 九江學(xué)院 化學(xué)與環(huán)境工程學(xué)院，九江 332005)
摘 要: 以P123作為模板劑，采用溶膠-凝膠法合成介孔SO42-/W-TiO2@SiO2(WSTS)可見光響應(yīng)光催化劑。以甲基橙為模型物，考察其在可見光及紫外光區(qū)的光催化活性。采用X射線衍射(XRD)、環(huán)境掃描電子顯微鏡(SEM)、高分辨透射電子顯微鏡(HRTEM)、X射線光電子能譜(XPS)、低溫氮物理吸附(BET)、紫外-可見漫反射光譜(UV-Vis)、傅里葉變換紅外光譜(FTIR)、熱重分析(TG) 和熒光光譜(PL)對樣品的結(jié)構(gòu)及性能進(jìn)行表征。結(jié)果表明：W摻雜不但可以提高樣品的比表面積、孔容，而且可以抑制晶型從銳鈦礦向金紅石轉(zhuǎn)變。與光催化劑P25及未摻雜的樣品相比，光催化活性明顯提高。且W的最佳摻雜量為n(W)/n(Ti)=0.002 5，其在可見光(λ＞400 nm) 和紫外光區(qū)輻照40 h和 60 min后，甲基橙的脫色率分別是91.7%和98.9%。
關(guān)鍵字: 溶膠-凝膠法；SO42-/W-TiO2@SiO2；介孔；可見光催化
（1. College of Chemical Engineering and Materials, Zhejiang University of Technology, Hangzhou 310014, China;
2. College of Chemistry and Environmental Engineering, Jiujiang University, Jiujiang 332005, China）
Abstract: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＞400 nm) for 40 h and UV light for 60 min, respectively.
Key words: sol-gel method; SO42-/W-TiO2@SiO2; mesoporous; visible light photocatalysis
