Preparation and improved photocatalytic activity of ordered mesoporous TiO_2 by evaporation induced self-assembly technique using liquid crystal as template  

基于液晶模板的蒸发诱导自组装技术合成高催化活性的有序介孔氧化钛(英文)

作　　者：刘晨[1] 李佑稷[1] 徐鹏[1] 李泽时 曾孟雄[1] 

机构地区：[1]吉首大学化学化工学院,吉首416000

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第4期1072-1078,共7页中国有色金属学报（英文版）

基　　金：Project (51172092) supported by the National Natural Science Foundation of China;Project (11A093) supported the Education Department of Hunan Province,China;Project (13JJ1023) supported by the Natural Science Fund for Distinguished Youth of Hunan Province,China;Project (NECT-12-0720) supported the Program for New Century Excellent Talents in Universities of China

摘　　要：Ordered mesoporous TiO2 （OMPT） was prepared by an evaporation induced self-assembly technique using liquid crystal as template. The key factors affecting the methylene blue （MB） oxidation efficiency were investigated, including the initial concentration of MB, pH value and catalyst concentration. The results show that the obtained OMPT has high thermal stability and shows a 2D hexagonal mesostructure with the small particle size and high surface area, which lead to higher degradation efficiency than commercial P25 or nanoparticle TiO2 （NPT） fabricated by sol-gel process. The optimal conditions are 5 mg/L MB, pH 6 and 1.5 g/L OMPT for the fastest rate of MB degradation. Total organic carbon （TOC） analysis indicates complete mineralization of MB in 240 min by OMPT, with rate constant higher than NPT or P25.利用蒸发诱导自组装技术,用液晶为模板制备有序介孔氧化钛(OMPT),探讨影响亚甲基蓝(MB)氧化降解效率的主要因素,包括MB的初始浓度、pH值和催化剂浓度。结果表明,所获得的OMPT具有二维六方介孔结构,粒径小,比表面积大,表现出高的热稳定性,这些都导致其比催化剂P25和溶胶–凝胶法制备的纳米氧化钛颗粒(NPT)有更高的降解效率。在MB浓度5 mg/L、pH 6和OMPT浓度1.5 g/L的条件下,MB的降解率最快。总有机碳(TOC)分析表明,OMPT在240 min内实现了对MB的完全矿化,其速率常数高于P25和NPT的。

关 键 词：TITANIA ordered mesopore liquid crystal template methylene blue degradation 

分 类 号：TQ134.11[化学工程—无机化工]