二氧化硅气凝胶对挥发性有机污染物的吸附性能研究  

Study on the Adsorption Performance of Silica Aerogel on Volatile Organic Compounds

作　　者：刘群[1,2] 张志华 刘源[2] 王晓栋[1] 沈军[1] Liu Qun;Zhang Zhihua;Liu Yuan;Wang Xiaodong;Shen Jun(Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology,Department of Physics Science and Engineering of Tongji University,Shanghai,200092;College of Science,University of Shanghai for Science and Technology,Shanghai,200093)

机构地区：[1]同济大学物理科学与工程学院上海市人工微结构材料与技术重点实验室,上海200092 [2]上海理工大学理学院,上海200093

出　　处：《化学通报》2020年第6期552-556,507,481,共7页Chemistry

基　　金：国家重点基础研究发展计划项目(2017YFA0204600);国家自然科学基金项目(11874288)资助。

摘　　要：以TEOS为前驱体、乙醇为溶剂、氢氟酸为催化剂,一步法合成了常规二氧化硅气凝胶。经乙醇超临界干燥后,通过SEM、FTIR和N2吸脱附分析仪等仪器对二氧化硅气凝胶样品进行表征,以更好地了解吸附机理与样品性质的关系。结果表明,样品的比表面积高达519m2/g,孔体积为1.9cm3/g,平均孔径为15.15nm,是一种优良的吸附材料。考察了样品对甲苯、对二甲苯和苯的吸附效果。结果表明,二氧化硅气凝胶对三种污染物都具有很高的吸附量,其高吸附能力归因于气凝胶的三维纳米网络结构。综上所述,二氧化硅气凝胶具有优异的吸附性能,是一种很有前景的处理挥发性有机化合物的吸附剂。The regular silica aerogel was synthesized through a one-step process using TEOS as precursor,ethanol as solvent and hydrofluoric acid as catalyst.After alcohol supercritical drying,the silica aerogel sample was characterized by SEM,FTIR,and nitrogen adsorption-desorption isotherms to better understand the relationship of the adsorption mechanism-property.The results indicated that the sample has a high specific surface area of 519m2/g,a pore volume of 1.9cm3/g and a large pore size of 15.15nm.The adsorption properties of the prepared samples for volatile organic compounds(VOCs)were tested.Toluene,paraxylene and benzene were selected as typical adsorbates due to their extensive utilization in industry.The results showed that silica aerogel has high adsorption capacity for all three pollutants.The high adsorption ability of silica aerogel is attributed to the nano-network structure and the small pore size.Therefore,the silica aerogel is a promising adsorbent for VOCs disposal with superior adsorption ability.

关 键 词：二氧化硅气凝胶 挥发性有机污染物 吸附剂 

分 类 号：O648.17[理学—物理化学] O647.33[理学—化学] X701[环境科学与工程—环境工程]