TiO_2/活性炭复合体超临界沉淀法制备及其光催化性能  

Photocatalytic Activity of Activated Carbon-supported TiO_2 Composites Prepared by Supercritical Fluid Deposition

作　　者：陈伟[1] 刘建本[1] 李佑稷[1] 李雷勇[1] 曾梦雄[1] 

机构地区：[1]吉首大学化学化工学院,湖南吉首416000

出　　处：《材料科学与工程学报》2011年第6期943-948,共6页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(10702001);安徽省优秀青年科技基金资助项目(10040606Y23)

摘　　要：以活性炭为载体、超临界二氧化碳为流体、钛酸丁酯为前驱体,用超临界流体沉积法制备TiO2/活性炭(TiO2/AC)复合体。用X射线衍射(XRD)、扫描电镜(SEM)、比表面积分析(BET)、热重-差热(TG-DTA)对TiO2/AC进行表征。以紫外灯为光源,偶氮类染料亚甲基蓝为标准降解物,考察TiO2/AC复合体的光催化活性。结果表明:TiO2/AC复合体对亚甲基蓝的光催化活性比P25和(TiO2+AC)混合体都强,归功于复合体中TiO2与AC的协调效应,以及AC负载的纳米颗粒较分散,粒径为25 nm左右,比P25粉体小。热处理温度影响晶型转变和晶粒生长,导致600℃下制备的TiO2/AC具有最大光催化活性。TiO2/AC composites were prepared by supercritical fluid deposition（SCFD）,with butyl titanate and activated carbon（AC） as precursor and support,respectively.The TiO2/AC was characterized by X-ray diffractometry（XRD） scanning electron microscopy（SEM）,BET specific surface area measurements,thermogravimetry-differential thermal analysis（TG-DTA）.The photocatalytic activity of TiO2/AC was investigated by the degradation of methylene blue（MB） under UV light.The results show that photoactivity of TiO2/AC is higher than that of P25 and the mixture of TiO2 and AC for MB degradation.It is attributed to the synergy effect of TiO2 and AC,the particle size of dispersed nano-TiO2 on AC is smaller than that of P25.TiO2/AC prepared at 600℃ shows the highest photocatalytic activity due to the effect of heat-treatment temperature on phase transformation and crystal growth.

关 键 词：活性炭 二氧化钛 超临界 光催化活性 亚甲基蓝 

分 类 号：TQ134[化学工程—无机化工]