Fe(Ⅲ)表面印迹硅胶聚合物的制备及其吸附性能研究  

Synthesis and adsorption properties of Fe(Ⅲ)surface imprinted silica gel polymer

作　　者：何红星 张炜业 邓秀君 甘强[2] 冯长根[2] HE Hong-xing;ZHANG Wei-ye;DENG Xiu-jun;GAN Qiang;FENG Chang-gen(School of Chemistry and Chemical Engineering,Kunming University,Kunming 650214,China;School of Mechatronical Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]昆明学院化学化工学院,昆明650214 [2]北京理工大学机电学院,北京100081

出　　处：《安全与环境学报》2023年第3期899-910,共12页Journal of Safety and Environment

基　　金：云南省教育厅科学研究基金项目(2019J0566,2022Y747);云南省科技计厅科技计划项目(202001BA070001-192,202001BA070001-120);昆明学院引进人才科研项目(YJL20025)。

摘　　要：选用硅胶为基质材料、乙烯基膦酸为功能单体、Fe^(3+)为模板离子、乙二醇双甲基丙烯酸酯为交联剂,通过表面印迹技术制备了一种新型膦酸功能化的Fe(Ⅲ)印迹硅胶聚合物。对印迹吸附材料的吸附条件、吸附选择性和重复利用率进行了研究。通过FT-IR、SEM、EDX、TG和N_(2)吸附/脱附分析对印迹材料进行了表征,分析了印迹吸附剂对Fe^(3+)的吸附机理。结果表明:印迹吸附剂在8 min可达吸附平衡,最大吸附量达16.12 mg/g,吸附行为符合准二级动力学方程和Langmuir吸附等温式,印迹吸附剂展现出较高的选择性识别能力,与Cr^(3+)、Mn^(2+)和Zn^(2+)相比,对Fe^(3+)的选择性系数k分别为8.9、10.75和12.37。经过6次吸附-解吸试验,印迹材料吸附Fe^(3+)的能力仅下降了5.9%,证明其具有很好的可重复使用性能。It is significant to remove irons in wastewater.In this study,a novel Fe(Ⅲ)ion surface-imprinted silica gel polymer(VPA-EGDMA-IIP/SiO_(2))was prepared via the surface imprinting technology by using vinyl phosphonic acid(VPA)as the functional monomer and ethylene glycol dimethacrylate(EGDMA)as the crosslinker.The synthesized imprinted silica gel polymer was used as a sorbent for selective adsorption of Fe^(3+)from an aqueous solution.The imprinted polymer was characterized by Fourier transform infrared spectroscopy(FT-IR),thermogravimetric(TG)analysis,scanning electron microscopy(SEM),Energy Dispersive X-Ray Spectroscopy(EDX),and N2adsorption-desorption isotherms.The adsorption properties,such as the effect of solution pH,adsorption kinetic,adsorption isotherm,adsorption selectivity as well as the regeneration of sorbent were studied.The result shows that the prepared Fe(Ⅲ)ion-imprinted polymer has good thermal stability when the ambient temperature is below 210℃.The surface area and the pore volume of VPA-EGDMA-IIP/SiO_(2)are greater than VPA-EGDMA-NIP/SiO_(2),and it may be attributed to the result that more recognition sites for the template Fe^(3+)ions are formed on the sorbent surface.Furthermore,after adsorption,the surface area and the pore volume of IIP-PA/SiO_(2)decreased,which is likely owing to the fact that Fe^(3+)ions are combined with recognition sites on the sorbent surface.The adsorption results show that the pH value of the solution has an important influence on the adsorption process,and the maximum adsorption capacity of VPA-EGDMA-IIP/SiO_(2)is obtained at a pH value of 2 in an aqueous solution with the maximum adsorption capacity 16.12 mg/g.The adsorption process followed the pseudo-second-order kinetics equation and the Langmuir isotherm adsorption model.The adsorption of Fe^(3+)on VPA-EGDMA-IIP/SiO_(2)belongs to a rapid chemical adsorption process and the adsorption equilibrium is achieved within 8 min.The adsorption process is spontaneous,exothermic and entropy reduced.The relative sele

关 键 词：环境工程学 表面印迹技术 印迹硅胶聚合物 Fe(Ⅲ)离子 吸附选择性 

分 类 号：X506[环境科学与工程—环境工程]