李海龍2, 何益波2
(1. 中南大學(xué) 能源科學(xué)與工程學(xué)院, 長沙 410083;
2. 湖南大學(xué) 環(huán)境科學(xué)與工程學(xué)院, 長沙 410082;
3. 中南大學(xué) 化學(xué)與化工學(xué)院, 長沙 410083)
摘 要: 采用溶膠-凝膠法制備B/Fe2O3共摻雜TiO2復(fù)合光催化材料, 并用X射線衍射儀(XRD)、 掃描電鏡(TEM)和紫外可見漫反射光譜(DRS)對粉體進(jìn)行表征。 結(jié)果表明： 催化劑以銳鈦礦存在的納米顆粒, 直觀地顯示了物質(zhì)的形貌, 摻雜B能極大提高催化劑的可見光響應(yīng)。 以二氯苯酚(DCP)為降解物質(zhì), 在紫外和可見光下分別研究了復(fù)合催化劑的光催化活性。摻雜B能使吸收光譜紅移至可見光區(qū), 而進(jìn)一步摻雜Fe2O3大大提高了催化劑的活性。
關(guān)鍵字: 納米TiO2; B/Fe2O3; 溶膠-凝膠; 共摻雜; 可見光; 光催化性能
GUO San-xia2, LI Hai-long2, HE Yi-bo2
（1. College of Energy Science and Engineering, Central South University,
Changsha 410083, China;
2. College of Environmental Science and Engineering,
Hunan University, Changsha 410082, China;
3. School of Chemistry and Chemical Engineering, Central South University,
Changsha 410083, China）
Abstract: Sol-gel method is used to prepare the photocatalysts. And it was characterized by X-ray diffractometry (XRD), TEM and UV-Vis diffuse reflectance spectra (DRS). The XRD results show that a structure composed only of anatase forms after calcination and the grain sizes are very small and separated uniformly, TEM shows analysis the characters of the figures, DRS results verify that TiO2 doped with B extends its absorption band significantly into the visible region. The 2, 4-dichlorophenol(DCP) was chosen as target pollutant, the degradation rate and the mineralization rate of the pollutants in the samples under both UV and visible light were investigated. The results show that the effect of B doping in TiO2 can extend the spectral response to the visible region and that the reaction activity is extraordinarily enhanced when it is further loaded with Fe2O3.
Key words: nano-TiO2; B/Fe2O3; sol-gel; codope; visible light; photocatalytic efficiency
