溶胶凝胶-交联制备H_3PW_(12)O_(40)/TiO_2/膨润土的研究  

Preparation of H_3PW_(12)O_(40)/TiO_2/Bentonite by Sol-gel and Cross-link Method

作　　者：张琳叶[1,2] 王艺志 严志伟[1] 康洪[1] 夏帆[1] 魏光涛[1] 李宽[1] 廖荣良[1] 范瑞国 

机构地区：[1]广西大学化学化工学院,广西南宁530004 [2]广西有色金属及特色材料加工重点实验室,广西南宁530004

出　　处：《非金属矿》2015年第1期15-18,共4页Non-Metallic Mines

基　　金：国家自然科学基金(21366003);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);广西自然科学基金(2013GXNSFAA019296);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);广西大学大学生实验技能和科技创新能力训练基金项目(SYJN20130308)

摘　　要：采用溶胶凝胶法制备H3PW12O40-Ti(OH)4凝胶,并交联于由季铵盐预插层的有机膨润土层间,制备了H3PW12O40/TiO2/膨润土复合光催化剂。通过考察制备工艺中主要因素焙烧温度、十六烷基三甲基溴化铵用量、酯醇体积比、H3PW12O40用量、焙烧时间等对催化剂光催化活性的影响,确定最佳制备工艺为焙烧温度400℃、十六烷基三甲基溴化铵用量7%、酯醇体积比8.5∶10、H3PW12O40用量0.6 g、焙烧时间2 h。H3PW12O40/TiO2/膨润土复合光催化剂的XRD、EDS表征表明,Keggin结构H3PW12O40和锐钛矿结构TiO2成功固载于膨润土。H3PW12O40-Ti（OH）4 hydrogel prepared by sol-gel was cross-linked in the layer space of organobentonite which was intercalated with quaternary ammonium, and then H3PW12O40/TiO2/bentonite composite photocatalyst was obtained. The effects of calcination temperature, dosage of cetyltrimethylammonium bromide, volume ratio of ester to alcohol, mass of H3PW12O40, and calcination time on the photocatalytic activity of composite photocatalyst were studied. The optimum process conditions for preparation of H3PW12O40/TiO2/bentonite were as follows： calcination temperature was 400℃; dosage of cetyltrimethylammonium bromide for organobentonite preparation was 7%; volume ratio of ester to alcohol was 8.5∶10; mass of H3PW12O40 was 0.6 g; and calcination time was 2 h. According to the characterization of XRD and EDS, Keggin H3PW12O40 and anatase TiO2 were successfully immobilized on bentonite.

关 键 词：溶胶凝胶 交联 有机膨润土 杂多酸 TIO2 

分 类 号：TQ426[化学工程] TD985[矿业工程—选矿]