A novel ethylenediamine chelating resin was prepared by grafting poly(glycidyl methacrylate)onto the chloromethylated polystyrene beads via surface-initiated atom transfer radical polymerization(SI-ATRP),and followed by the Open loop reaction of epoxy and amine groups.The resin was characterized by infrared spectroscopy,scanning electron microscopy and elemental analysis.The adsorption of the resin on Cu(Ⅱ)and Cd(Ⅱ)was examined.By analyzing the influence of solution pH on the adsorption capacity,adsorption isotherm and adsorption kinetics curve,the adsorption of Cu(Ⅱ)and Cd(Ⅱ)on PEDA-g-PS resin is proved to be Langmuir single-layer adsorption model,and adsorption process conforms to pseudo-second-order kinetic equation.The maximum sorption capacities of Cu(Ⅱ)and Cd(Ⅱ)were 1.19 and 1.95 mmol/g at pH3.0.After 10 adsorption-desorption cycles,the adsorption capacity of the resin did not change significantly,indicating that the resin has excellent adsorption properties for heavy metal ions and excellent reusability.
关键词
氯甲基化聚苯乙烯树脂/表面引发原子转移自由基聚合/重金属离子/吸附
Key words
chloromethylated polystyrene bead/surface-initiated atom transfer radical polymerization/heavy metal ion/adsorption
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