缓冲溶液对单相锐钛矿纳米TiO_2表面吸附及可见光催化性能的影响  

Effect of Buffer Solutions on Surface Adsorbed Organics and Visible Light Photocatalytic Activity of TiO_2 Nano-Photocatalyst with Single Anatase Phase

作　　者：方亚男[1] 黄光煜[1] 李明[1] 张朋越[1] 洪樟连[1] 

机构地区：[1]浙江大学材料科学与工程学系,浙江杭州310027

出　　处：《稀有金属材料与工程》2008年第A02期387-390,共4页Rare Metal Materials and Engineering

基　　金：浙江省科技厅项目(2003C11027);project of SRF for ROCS;SEM(2003-14)资助

摘　　要：以钛酸丁酯为反应前驱物,在丙酮溶剂中采用有机溶剂水热法合成了纳米TiO2粉体。通过X-射线衍射(XRD),透射电镜(TEM)和差热-热失重(DTA-TG)等手段分析了物相结构、颗粒尺寸和吸附特性,采用紫外-可见光谱(UV-Vis)手段,通过在不同pH值和组成的缓冲溶液中进行超声处理的方法考察样品表面吸附的有机物状态变化及其对可见光催化性能的影响。UV-Vis测试结粜表明在250 nm处的有机溶出物量随超声处理液pH值的增加先增加后减小,溶液为中性时达到最大值。可见光下(≥450 nm)降解甲基橙的结果表明,样品光催化活性不仅和表而吸附的有机物有关,同时受到溶液的pH值及所含阴离子种类的影响。Low frequency ultrasonic treatment in buffer solutions with different pH and anions, was usually applied to desorb the organic compounds from the surface of hydrothermal prepared nanosized TiO2 photocatalyst. It was found the amount of organics desorbed from the TiO2 surface decreased in acid and basic solutions and achieved maximum in neutral solutions. Furthermore, the results of the photocatalytic activity, measured through UV-Vis analysis for methyl-orange solution under visible light irradiation（λ≥450 nm）, indicated that the photocatalytic degradation rate was highly relevant to the pH and anions of the buffer solution.

关 键 词：TIO2 可见光催化 有机物 超声处理 缓冲溶液 

分 类 号：O643.36[理学—物理化学]