氨基功能化大尺寸SiO_2大孔材料的制备及其吸附性能  

Preparation and adsorption properties of amino-functionalized large-sized SiO_2 macroporous materials

作　　者：张群[1] 张育淇[1] 梁云霄[1,2] 张瑞丰[1] 

机构地区：[1]宁波大学材料科学与化学工程学院,浙江宁波315211 [2]南开大学先进能源材料化学教育部重点实验室,天津300071

出　　处：《功能材料》2013年第12期1726-1730,共5页Journal of Functional Materials

基　　金：国家重点基础研究发展计划(973计划)前期专项资助项目(2010CB635116);浙江省自然科学基金资助项目(LY12B01004);宁波市社会发展资助项目(2011C50052);宁波大学王宽诚幸福基金资助项目(XKL072)

摘　　要：以具有三维骨架结构的环氧树脂大孔聚合物为整体型模板,利用硅酸酯原位水解和高温烧结制备出大尺寸SiO2大孔材料。在溶剂热条件下,用3-氨丙基三乙氧基硅烷对SiO2大孔材料进行表面修饰,得到氨基功能化SiO2大孔材料(H2N-SiO2)。用SEM和FT-IR对制备的大孔材料进行了表征。以Cu2+和Pb2+为模拟污染物,研究了H2N-SiO2的吸附性能。结果表明,室温下,在pH值为6.5时能有效吸附Cu2+和Pb2+;吸附为放热自发过程;吸附过程符合准二级动力学方程;吸附等温线用Freundlich方程拟合的结果优于Langmuir方程,H2N-SiO2对Cu2+和Pb2+的理论最大吸附量分别为76.0和143mg/g;H2N-SiO2对50mg/L水溶液中Pb2+的去除率可达99.4%,重复使用3次后对Pb2+的去除率保持在87.8%。Large-sized SiO2 macroporous materials were prepared by using a three-dimensional skeletal epoxy resin macroporous polymer as template through an in situ hydrolysis of ethyl silicate and a subsequent calcina- tion at high temperature. The amino-functionalized SiO2 macroporous materials （H2N-SiO2） were obtained through the surface modification of the SiO2 macroporous materials with 3-aminopropyl-triethoxysilane under solvothermal conditions. The as-prepared macroporous materials were characterized by SEM and FT-IR. Cu2＋ and Pb2＋ were selected as simulative pollutants, the adsorption properties of H2N-SiO2 were investigated. The results show that Cu2＋ and Pb2＋ can be effectively removed from aqueous solution at room temperature and pH 6.5. The adsorption was an exothermic and spontaneous process. The adsorption follows a pseudo-second order process. The equilibrium isotherm is well described by the Freundlich model rather than the Langmuir model and the theoretical maximum adsorption capacities of Cu2＋ and Pb2＋ are 76.0 and 143mg/g, respectively. The removal efficiency of Pb2＋ was found to be 99.4% at an initial concentration of 50mg/L. After 3 cycles of ad- sorntion. 87.8 % removal efficiency of Pb2＋ was maintained.

关 键 词：大尺寸SiO2大孔材料 氨基功能化 吸附 CU2+ PB2+ 

分 类 号：TQ424[化学工程]