In order to improve the selectivity of anion exchange resin, the surface of gel type anion exchange resin was modified with polyethyleneimine (PEI). In the proposed work an attempt to the utilization of commercial anion exchange resin modified by adsorption of polyethyleneimine was investigated. Many conditions of modification of anion exchange resin surface were studied. The influent parameters on the DOWEX 1X8 resin modification were determined using a factorial experimental design. The ion exchange reactions were studied for modified and unmodified resin and electrolyte solutions containing Cl - ，NO 3 - ， SO 4 2- . All experiments were performed at constant ionic strength I = 0.3 mol·L -1 and constant temperature T = 298 K. Ionic exchange isotherms were established for the binary systems: Cl - / NO 3 - ， Cl - / SO 4 2- and NO 3 - / SO 4 2- . The obtained results show that nitrate ion was more sorbed than chloride and sulfate. The order of preference for the anions studied in this investigation is: NO 3 - > Cl - > SO 4 2- . All the results given by this resin were compared with those obtained with the AMX anion exchange membrane. Selectivity coefficients and thermodynamic constants for the three binary systems and for the two resins were determined. The modified resin became more selective towards monovalent anions.
KeywordsResinModificationPolyethyleneimineFactorial DesignBinary System IsothermSelectivity Coefficient
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