水热法合成的介孔二氧化钛的结构表征及其对水中2,4,6-三溴苯酚的光催化降解活性(英文)  

Structural Characterization and Photocatalytic Activity of Hydrothermally Synthesized Mesoporous TiO_2 for 2,4,6-Tribromophenol Degradation in Water

作　　者：罗海英 聂信[1,2] 李桂英[1] 刘冀锴[1,2] 安太成[1] 

机构地区：[1]中国科学院广州地球化学研究所有机地球化学国家重点实验室广东省环境资源利用与保护重点实验室,广东广州510640 [2]中国科学院研究生院,北京100049

出　　处：《催化学报》2011年第8期1349-1356,共8页

基　　金：supported by the National Natural Science Foundation of China(21077104);Knowledge Innovation Program of Guangzhou Institute of Geochemistry,CAS(GIGCX-10-01);the Science and Technology Project of Guangdong Province,China(2009A030902003,2009B030400001,and2009B091300023)~~

摘　　要：以聚丙二醇(PPG)为模板剂,采用水热法制备了可控介孔TiO2纳米晶体.醋酸水溶液为水解抑制剂和催化剂.运用X射线衍射、热重分析、扫描电镜和氮气吸附-脱附等技术对样品进行了表征.详细考察了制备过程、模板剂含量和煅烧温度等参数对样品结构和光催化活性的影响,并将样品用于紫外光下降解水体中典型溴代阻燃剂2,4,6-三溴苯酚的反应中,阐明制备的介孔TiO2结构与光催化活性之间的关系.结果表明,所制样品为具有规则孔道结构、较大的孔径和较高比表面积的介孔TiO2.其中,在400°C煅烧、PPG添加量为20%时所得介孔TiO2的光催化活性最高,反应1h可将100μmol/L的2,4,6-三溴苯酚完全降解.Well defined mesoporous TiO2（M-TiO2）nanocrystallites were prepared by the hydrothermal method using polypropylene glycol（PPG）as template.The method differs from traditional methods in the use of an acetic acid aqueous solution instead of the conventional hydrolysis inhibitors and acid catalysts.The morphology and microstructures of M-TiO2 were characterized by X-ray diffraction,thermogra-vimetric and differential thermogravimetric,scanning electron microscopy,and nitrogen adsorption-desorption.The effects of the synthesis process,template reagent content,and calcination temperature on the microstructure and photocatalytic activity were investigated.The rela-tionship between the microstructure of M-TiO2 and its photocatalytic activity was studied by the photocatalytic degradation of 2,4,6-tribromophenol in water under UV irradiation.M-TiO2with a regular channel structure,large pore size,and high specific surface area was successfully synthesized.The M-TiO2 synthesized by the hydrothermal method and calcined at 400 °C that used a PPG content of 20% gave the highest photocatalytic activity,and completely degraded 100 μmol/L 2,4,6-tribromophenol within 1 h.

关 键 词：介孔二氧化钛 水热合成 结构表征 光催化活性 2 4 6-三溴苯酚 

分 类 号：O643.36[理学—物理化学]