Preparation of High-capacity IDA Chelating Resin and Its Adsorption Properties

doi:10.7503/cjcu20120616

Abstract

Abstract:

A new high-capacity iminodiacetic acid(IDA) chelating resin was synthesized via surface-initiated atom transfer radical polymerization(SI-ATRP) method. Glycidyl methacrylate(GMA) was grafted onto the surface of the chloromethyl polystyrene resin by SI-ATRP using the organic metal compound formed in the CuBr/2,2'-bipyridine(Bpy) system as catalyst at room temperature. The IDA chelating resin was synthesized by grafting IDA on the surface of polyglycidyl methacrylate(PGMA) modified polystyrene resin. The chelating resin was characterized by means of elementary analysis, and evaluated in details to determine its adsorption properties and parameters of kinetics and the thermodynamics. The amount of IDA on the surface of polystyrene resin was calculated to be 8.15 mg/m². Adsorption capacity of copper(Ⅱ) increased with increasing initial metal ion concentration and temperature, and its highest adsorption capacity was 1339.66 mg/g at pH=2.2. The experimental results showed that the equilibrium adsorption data fitted well to both Langmuir and Freundlich isotherms. The thermodynamic equilibrium functions were also determined. ΔG<0, ΔH=270.60 kJ/mol, ΔS>0, so the adsorption was spontaneous, endothermic and entropy increasing. The kinetic experimental data were correlated with second-order kinetic model.

Key words: Iminodiacetic acid(IDA) chelating resin, Surface-initiated atom transfer radical polymerization method, Adsorption property, Kinetics, Thermodynamics

CLC Number:

O631
O647.3

TrendMD:

DONG Jia-Bin, WU Jian-Bo, YANG Jing, SONG Wei, DAI Xiao-Jun, YE Zheng-De, GONG Bo-Lin. Preparation of High-capacity IDA Chelating Resin and Its Adsorption Properties[J]. Chem. J. Chinese Universities, 2013, 34(3): 714.

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Preparation of High-capacity IDA Chelating Resin and Its Adsorption Properties

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