胺基改性二氧化硅气凝胶的制备及对刚果红的吸附性能  

Study on the Preparation of Amine-modified Silica Aerogel and Its AdsorptionPerformance for Removing Congo Red from Water

作　　者：应宗耀 郑煜铭[1] 邵再东 程璇[2,3] YING Zongyao;ZHENG Yuming;SHAO Zaidong;CHENG Xuan(CAS Key Laboratory of Urban Pollutant Conversion,Institute of Urban Environment,Chinese Academy of Sciences,Xiamen 361021,China;College of Materials,Xiamen University,Xiamen 361005,China;Fujian Key Laboratory of Advanced Materials,Xiamen 361005,China)

机构地区：[1]中国科学院城市环境研究所中科院城市污染物转化重点实验室,厦门361021 [2]厦门大学材料学院,厦门361005 [3]福建省先进材料重点实验室,厦门361005

出　　处：《材料导报》2021年第20期20005-20010,共6页Materials Reports

基　　金：国家自然科学基金(51578525)。

摘　　要：超轻多孔二氧化硅气凝胶具有极低密度、超高孔隙率和大比表面积的特点,是优异的吸附剂载体。但是,二氧化硅气凝胶骨架表面以硅羟基为主,对污染物的吸附选择性差、吸附容量低。本研究采用共前驱体的方法制备了胺基改性二氧化硅气凝胶块体材料,系统考察了其对模拟污染物阴离子染料刚果红的吸附性能。结果表明,胺基改性二氧化硅气凝胶对刚果红有优异的吸附性能,在较宽pH(3~9)范围内,吸附容量可达800~900 mg/g,吸附等温线符合Langmiur模型;胺基改性气凝胶对刚果红的吸附速率快,1 h内吸附量可达饱和吸附量的80%以上,吸附动力学符合准二级动力学模型;动态吸附实验也显示胺基改性气凝胶对刚果红具有优异的的吸附穿透容量。故改性二氧化硅气凝胶是一种性能优异的阴离子染料吸附剂。Silica aerogel,as a kind of ultralight porous material,has the characteristics of extremely low density,ultra-high porosity and large specific surface area,which is an excellent adsorbent carrier.However,the surface of silica aerogel skeleton is mainly composed of silicon hydroxyl groups,which has poor adsorptive selectivity and low adsorption capacity for pollutants.In this work,an excellent adsorbent was developed by functional modification of silica aerogel with amine group.Anion dye Congo red was used as model pollutant.Results showed that the amine-modified silica aerogel had excellent adsorption performance,of which the maximum adsorption capacity for Congo red could reach 800—900 mg/g according to Langmiur isotherm model in a wide pH range of 3—9.The adsorption kinetics of Congo red on the amine-modified silica aerogel was fast,which could be well described with pseudo-second-order kinetics model,and more than 80%of the maximum adsorption capacity was obtained within 1 h.According to dynamic adsorption experiments,the amine-modified silica aerogel showed excellent dynamic adsorption capacity.Results showed the amine-modified silica aerogel is promising adsorbent for anion dye.

关 键 词：二氧化硅气凝胶 胺基改性 吸附 刚果红 

分 类 号：TB34[一般工业技术—材料科学与工程]