H_3PW_(12)O_(40)-TiO_2/膨润土光催化降解甲基橙的催化性能  

Catalytic Performance of H_3PW_(12)O_(40)-TiO_2/bentonite in Photocatalytic Degradation of Methyl Orange

作　　者：张琳叶[1,2] 夏帆[1] 魏光涛 叶瑞翠[1] 莫继华 李仲民[1] 黎铉海[1] 

机构地区：[1]广西大学化学化工学院,南宁530004 [2]广西有色金属及特色材料加工重点实验室,南宁530004 [3]广西石化资源加工及过程强化技术重点实验室,南宁530004

出　　处：《土木建筑与环境工程》2013年第5期30-35,共6页Journal of Civil,Architectural & Environment Engineering

基　　金：教育部高等学校博士学科点专项科研基金联合资助项目(20114501120001);广西大学广西有色金属及特色材料加工重点实验室开放基金(GXKFJ12-22);广西高等学校科研项目(桂教科研201203YB005);广西自然科学基金项目(2013GXNSFAA019296)

摘　　要：通过溶胶凝胶制得H3PW12O40-Ti(OH)4凝胶,并柱撑于膨润土层间制备了复合光催化剂H3PW12O40-TiO2/膨润土。由XRD、SEM、EDS对制备的复合光催化剂进行表征测试表明,固载的H3PW12O40-TiO2使膨润土层状结构发生明显变化,柱撑体H3PW12O40-TiO2呈弥散状态,且TiO2为锐钛结构,催化剂为颗粒粒径大小不一、分布松散的复合材料。对甲基橙的H3PW12O40-TiO2/膨润土光催化降解应用表明,掺杂的杂多酸使所制备的复合催化剂光催化活性得到了极大提高,在光催化体系下有较广的pH适应范围,且制备的催化剂具有良好的催化稳定性。在表征分析及应用实验的基础上,提出了H3PW12O40-TiO2/膨润土的强化催化作用原理。H3PW12O40-Ti（OH）4 hydrogel was prepared by the sol-gel method, and then HaPWlzO40-TiO2/ bentonite was prepared through the intercalation of H3PW12 O40-Ti（OH）4 into interlayer space. The characterization of XRD, SEM and EDS showed that HaPW12 O40- TiO, species were successfully immobilized on bentonite, and the layer strucure of bentonite was changed. The discrete anatase TiO2 existed on the bentonite. HaPW12 O40-TiO2/bentonite was a composite material with the different particle size and th loose structure. The photocatalytic degradation of methyl orange showed that the photocatalytic activity of catalyst had been better by doping H3PW12O40, and the H3PW12O40/TiOa/bentonite had a wide applicable range of pH value. Moreover, Ha PW12 O40- TiO2 /bentonite had a good catalytic stability. Based on the results of characterization analysis and catalytic performance, the schematic procedure for the actionmechanism of Ha PWI O40-TiO2/Bentonite in photocatalysis was presented.

关 键 词：膨润土 磷钨酸 TIO2 光催化 甲基橙 

分 类 号：X703.1[环境科学与工程—环境工程]