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Removal of heavy metal ions by a chelating resin containing glycine as chelating groups

机译:用甘氨酸作为螯合基团的螯合树脂去除重金属离子

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A porous chelating resin,crosslinked poly(glycidyl methacrylate-glycine)(PGLY),was synthesized through an epoxy group reaction of crosslinked poly(glycidyl methacrylate)with glycine for the removal of Cu(II),Ni(II)and Cd(II)from aqueous solutions.The interaction between a metal ion and chelating groups within PGLY was examined using FT-IR analysis.In single-metal ion solutions,all the adsorptions tended toward equilibrium at 40 min and the equilibrium adsorption capacities of PGLY were 1.22,1.07 and 0.96 mmol/g for Cu(II),Ni(II)and Cd(II),respectively.Except pH>4.0,as pH of the solution decreased the adsorption capacity of each metal ion decreased.After 15 cycles of adsorption-desorption operations,the re-adsorption capacities could attain 86-93% of initial values of uptake.When the pH of the mixture solutions were 2 or 2.5,the competitive adsorption tests confirmed this resin had good adsorption selectivity for the recovery of Cu(II)from Cu(II)/Ni(II)or Cu(II)/Cd(II)mixture.
机译:通过交联聚甲基丙烯酸缩水甘油酯与甘氨酸的环氧基反应合成了一种多孔螯合树脂,即交联聚甲基丙烯酸缩水甘油酯-甘氨酸(PGLY),以去除Cu(II),Ni(II)和Cd(II)。用FT-IR分析了PGLY中金属离子与螯合基团之间的相互作用。在单金属离子溶液中,所有吸附在40 min时趋于平衡,PGLY的平衡吸附容量为1.22, Cu(II),Ni(II)和Cd(II)的浓度分别为1.07和0.96 mmol / g。除了pH> 4.0以外,随着溶液pH值的降低,每种金属离子的吸附能力均降低。经过15个吸附循环-解吸操作中,再吸附能力可达到初始吸收值的86-93%。当混合溶液的pH值为2或2.5时,竞争性吸附试验证明该树脂对Cu(II)的回收具有良好的吸附选择性。 )由Cu(II)/ Ni(II)或Cu(II)/ Cd(II)混合物制得。

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