大尺寸SiO2大孔材料的表面改性及其吸附性能

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，利用硅酸酯原位溶胶-凝胶过程和高温烧结法制备出大尺寸SiO2大孔材料，通过水热法用铝酸钠对材料进行表面改性，得到铝掺杂SiO2大孔材料（Al-SiO2），并用SEM、FTIR和XPS对大孔材料进行了表征．以Cu^2＋和Pb^2＋为模拟污染物，研究改性大孔材料的吸附性能．结果表明：改性大孔材料对Cu^2＋和Pb^2＋均具有良好吸附能力；Al-SiO2对Cu^2＋和Pb^2＋的最大吸附量分别为71mg·g^-1和138mg·g^-1，0．100gAl-SiO2对100mL50mg·L^-1水溶液中Pb^2＋的去除率达到95.3％，重复使用3次后的去除率保持在89．8％．

Surface Modified Large-sized SiO2 Macroporous Materials and their Adsorption Properties

Large-sized SiO2 macroporous materials are prepared using a three-dimensional(3D) skeletal epoxy resin macroporous polymer as template through an in situ sol-gel process of ethyl silicate and a subsequent calcination at high temperature.The SiO2 macroporous materials are modified with sodium aluminate through hydrothermal method.The Al-doped SiO2 macroporous materials(Al-SiO2) are obtained and characterized by SEM,FTIR and XPS.Cu2+ and Pb2+ are selected as simulative pollutants,the adsorption properties of the modified SiO2 macroporous materials are investigated.The results show that the modified macroporous materials have satisfactory adsorption capacity for Cu2+ and Pb2+.Using Al-SiO2 as adsorbents,the maximum adsorption capacities of Cu2+and Pb2+are 71 mg.g-1and 138 mg.g-1,respectively.The removal efficiency of Pb2+ is found to be 95.3% at an initial concentration of 50 mg.L-1,100 mL aqueous solution and 0.100 g Al-SiO2.After 3 cycles of adsorption,89.8% removal efficiency of Pb2+is maintained.