超临界CO2辅助制备TiO2外负载火山岩复合体及其光催化降解亚甲基蓝性能(英文)  

Preparation of Cost-Effective TiO_2-Outerloaded Porous Lava Composites Using Supercritical CO_2 and Their Photocatalytic Activity for Methylene Blue Degradation

作　　者：马明远[1] 李佑稷[1] 陈伟[1] 李雷勇[1] 

机构地区：[1]吉首大学化学化工学院,湖南吉首416000

出　　处：《催化学报》2010年第10期1221-1226,共6页

基　　金：Supported by the National Natural Science Foundation of China (50802034);the Scientific Research Fund of Hunan Provincial Education Department (08B063)

摘　　要：以钛酸丁酯为前驱体,封堵的火山岩为载体,通过超临界CO2辅助制备了TiO2外负载火山岩复合体,并将其用于光催化降解亚甲基蓝反应,考察了溶液pH值及催化剂浓度对反应性能的影响.结果表明,TiO2外负载火山岩复合体的光催化性能优于纯TiO2和TiO2体负载火山岩复合体.这是由于外负载复合体对亚甲基蓝的高吸附性、小晶粒尺寸的TiO2颗粒以及吸附和光催化降解间的协同效应.亚甲基蓝浓度为1.5mg/L,溶液pH为8,催化剂浓度为6.8mg/L时,外负载TiO2火山岩复合体上亚甲基蓝降解速率最高,且使用后的催化剂仍具有高的光催化活性.Cost-effective TiO2-outerloaded lava composites （TOLs） were prepared using supercritical CO2 and sealing lava as well as tetrabutyl titanate as a support and a precursor, respectively. The important factors affecting methylene blue （MB） oxidation efficiency were investigated including the initial concentration of MB, the pH, and catalyst concentration. The results show that TOLs have a higher degrada-tion efficiency than pure TiO2 and TiO2-loaded lava composites （TLLs） because of the high adsorption capacity of MB and the small crystal-line size of the TiO2 particles in addition to a synergetic effect for adsorption and photocatalytic degradation. The optimum conditions were a MB concentration of 1.5 mg/L at pH 8 with a TOLs concentration of 6.8 mg/L for the fastest MB degradation. Additionally, the used TOLs retained high activity for MB photocatalytic degradation.

关 键 词：二氧化钛 多孔火山岩 溶胶凝胶法 光催化 亚甲基蓝 超临界二氧化碳 

分 类 号：O643.32[理学—物理化学]