吴春丽,申乾宏,张琎珺,汪澜.TiO2/膨润土复合光催化材料的常温制备及性能研究[J].稀有金属材料与工程,2020,49(4):1268~1272.[Wu Chunli,Shen Qianhong,zhangjinjun,wanglan.Preparation and Properties of TiO2/ bentonite Composite Photocatalytic Materials at Room Temperature[J].Rare Metal Materials and Engineering,2020,49(4):1268~1272.]
TiO2/膨润土复合光催化材料的常温制备及性能研究
投稿时间:2019-04-26  修订日期:2019-08-09
中文关键词:  二氧化钛  膨润土  吸附  光催化  溶胶-凝胶法
基金项目:国家重点研发计划课题(课题编号:2018YFD1101003)
中文摘要:
      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%。
Preparation and Properties of TiO2/ bentonite Composite Photocatalytic Materials at Room Temperature
英文关键词:TiO2  bentonite  adsorption  photocatalysis  sol-gel method
英文摘要:
      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 (70oC) 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 their photocatalytic activities were also investigated. The results show that the high water addition amount is conducive to the formation of TiO2 nanocrystals. When the molar ratio of deionized water: etrabutyl 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 embed 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: etrabutyl titanate is 192:1, the composite photocatalytic material shows the highest photocatalytic activity under UV light, and the degradation rate of methylene blue can reach to 93.8%.
作者单位E-mail
吴春丽 中国建筑材料科学研究总院 绿色建筑材料国家重点实验室 wcl198406@163.com 
申乾宏 浙江大学 硅材料国家重点实验室  
张琎珺 中国建筑材料科学研究总院 绿色建筑材料国家重点实验室  
汪澜 中国建筑材料科学研究总院 绿色建筑材料国家重点实验室  
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