Preparation of Fe3O4@ion imprinted poly(MMA-HPMA-DVB) magnetic composite and its selective adsorption to Ni(Ⅱ)
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摘要: 采用超声协助悬浮聚合法以Ni(Ⅱ)离子为模板制备了氨基功能化纳米Fe3O4-离子印迹聚(甲基丙烯酸甲酯(MMA)-3-(2-氨基乙基胺)-2-甲基丙烯酸羟丙酯(HPMA)-二乙烯基苯(DVB))磁性复合材料(Fe3O4@ion imprinted poly(MMA-HPMA-DVB),Fe3O4@ⅡP(MMA-HPMA-DVB))。通过EA、XRD、FTIR、TEM、VSM等手段对Fe3O4@ⅡP(MMA-HPMA-DVB)的组成、结构、形貌、磁性等进行了表征,并研究了其吸附水中Ni(Ⅱ)的性能。结果表明:合成的Fe3O4@ⅡP(MMA-HPMA-DVB)平均粒径为100 nm,饱和磁化强度为43.8 emu/g;共聚单体甲基丙烯酸甲酯(MMA)的羰基通过氢键与Fe3O4表面羟基结合,有利于Fe3O4@ⅡP(MMA-HPMA-DVB)的核-壳结构的形成与稳定;Fe3O4@ⅡP(MMA-HPMA-DVB)对Ni(Ⅱ)的吸附受溶液pH值影响较小;等温吸附线符合Langmuir模型,饱和吸附量(qm,c=500 mg/g,qm,e=478 mg/g)高于非离子印迹材料(Fe3O4@none-ion imprinted poly(MMA-HPMA-DVB),Fe3O4@NIP(MMA-HPMA-DVB)),qm,c=90.9 mg/g,qm,e=83.8 mg/g)。吸附过程可在5 min内达到平衡,符合准二级动力学模型。Fe3O4@ⅡP(MMA-HPMA-DVB)能高选择性地有效吸附水中Ni(Ⅱ),对Ni(Ⅱ)的印迹因子(α)为1.9,对几种常见共存离子的选择性因子(β)>7.7,是潜在的高选择性吸附和回收Ni(Ⅱ)的功能材料。Abstract: An amino-functionalized Fe3O4-ion imprinted poly(methyl methacrylate (MMA)-3-(2-amino-ethylamino)-2-hydroxypropyl methacrylate (HPMA)-divinylbenzene(DVB)) magnetic composite (Fe3O4@ion imprinted poly(ⅡP) (MMA-HPMA-DVB)) was synthesized via ultrasonic assisted suspension polymerization with nickel(Ⅱ) as ion imprinting template. The Fe3O4@ⅡP(MMA-HPMA-DVB) was characterized by EA, XRD, FTIR, TEM, TG and VSM. The application for its adsorption properties on Ni(Ⅱ) from water was investigated. The results show that the Fe3O4@ⅡP(MMA-HPMA-DVB) has an average size of 100 nm, with the saturation magnetization intensity of 43.8 emu/g. The carbonyl group of the co-monomer methyl methacrylate (MMA) can connect with the hydroxyl group at the surface of the nano-Fe3O4 via hydrogen bonds, which would be favorable to the formation and stabilization of the coreashell structure of the Fe3O4@ⅡP(MMA-HPMA-DVB). The adsorption capacities were investigated by adsorbing the Ni(Ⅱ) from aqueous solutions, which demonstrate an excellent adsorption capacity with the maximum adsorption capacity (qm,c at 500 mg/g, qm,e at 478 mg/g) much higher than that of amino-functionalized nano-Fe3O4-none-ion imprinted polymer magnetic material (Fe3O4@NIP(MMA-HPMA-DVB) (qm,c at 90.9 mg/g, qm,e at 83.8 mg/g). The isothermal adsorption curve mainly obeys the Langmuir mode. The adsorption kinetic studies show that the adsorption processes reach the equilibrium within 5 min and the kinetic data are well fitted to the pseudo-second-order model. There is almost no interference by the coexisting components in water for the adsorption of Ni(Ⅱ), with imprinting factor (α) at 1.9, and selectivity factor (β) more than 7.7 for several kinds of common co-existing ions, respectively. The Fe3O4@ⅡP(MMA-HPMA-DVB) is an ideal candidate for adsorption and recycle Ni(Ⅱ) from aqueous solution.
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