TiO2/膨润土复合光催化材料的室温制备及性能研究  

Preparation and Properties of TiO2/Bentonite Composite Photocatalytic Materials at Room Temperature

作　　者：吴春丽 申乾宏[2,3] 张琎珺 汪澜 Wu Chunli;Shen Qianhong;Zhang Jinjun;Wang Lan(State Key Laboratory of Green Building Materials,China Building Materials Academy,Beijing 100024,China;State Key Laboratory of Silicon Materials,Zhejiang University,Hangzhou 310027,China;Zhejiang California International Nano Systems Institute,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]中国建筑材料科学研究总院有限公司绿色建筑材料国家重点实验室,北京100024 [2]浙江大学硅材料国家重点实验室,浙江杭州310027 [3]浙江大学浙江加州国际纳米技术研究院,浙江杭州310058

出　　处：《稀有金属材料与工程》2020年第4期1268-1272,共5页Rare Metal Materials and Engineering

基　　金：国家重点研发计划(2018YFD1101003)。

摘　　要：采用改进的溶胶-凝胶法,在以水为主要溶剂的反应体系中,控制钛酸四丁酯充分水解、缓慢聚合,在常压、低温(70℃)的温和条件下制备出稳定的TiO2纳米晶溶胶,并利用TiO2纳米晶溶胶在膨润土表面负载,获得TiO2/膨润土复合光催化材料。采用X射线衍射、扫描电镜、比表面积测定等研究手段对样品的结构形貌进行了表征,并考察了其光催化活性。结果表明:较高的水用量有利于TiO2晶体形成,当去离子水:钛酸四丁酯摩尔比大于167:1时,在溶胶体系中出现了锐钛矿型TiO2纳米晶体;TiO2纳米晶主要负载于膨润土表面,并未嵌入到膨润土层间结构,但相对于单一膨润土,TiO2负载显著提高了材料比表面积;当去离子水:钛酸四丁酯摩尔比=192:1时,在紫外光照射下,复合光催化材料表现出最高的光催化活性,对亚甲基蓝的降解率达到93.8%。In a reaction system using water as the main solvent,the stable TiO2 nanocrystal sol was synthesized under the mild conditions of atmospheric pressure and low temperature(70℃)through the improved sol-gel method with controlling tetrabutyl titanate to fully hydrolyze and slowly polymerize.TiO2/bentonite composite photocatalytic material was further prepared by the loading of TiO2 nanocrystal sol on the surface of bentonite.XRD,SEM and BET were adopted to analyze the structure and morphology of as-prepared samples,and the photocatalytic activities were also investigated.The results show that the large water addition amount is conducive to the formation of TiO2 nanocrystals.When the molar ratio of deionized water to tetrabutyl titanate is higher than 167:1,the anatase TiO2 nanocrystals appear in the sol system.TiO2 nanocrystals are mainly loaded on the surface of bentonite rather than being embedded into the structure between bentonite layers.However,compared with a pure bentonite,the TiO2 loading significantly increases the specific surface area of the material.When the molar ratio of deionized water to tetrabutyl titanate is 192:1,the composite photocatalytic material shows the highest photocatalytic activity under UV light,and the degradation rate to methylene blue can reach 93.8%.

关 键 词：二氧化钛 膨润土 吸附 光催化 溶胶-凝胶法 

分 类 号：TB383[一般工业技术—材料科学与工程]