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.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
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
关键词
TIO2
可见光催化
有机物
超声处理
缓冲溶液
TiO2
visible light photocatalytic
organics
ultrasonic treatment
buffer solution
