Chemical modification of plasticized polyvinylchloride with polyethylenepolyamine leads to anion exchange resin (PPE-1). Different characterization techniques, such as XRD, FTIR, and SEM of PPE-1 anion exchanger revealed weak base amino groups as well as macroporous structure morphology. PPE-1 turned out effective to remove hexavalent chromium ions from aqueous media. Corresponding adsorption kinetics best fit the pseudo-second order model that followed a Freundlich isotherm. In the case of hexavalent chromium ions, the maximum adsorption capacity of PPE-1 was 218.4 mg/g. Thermodynamic data revealed spontaneous endothermic processes and a chemisorption reaction. In addition, results show that the anion exchanger (PPE-1) has 98% for removing hexavalent chromium ions containing from wastewater.
Chromium pollution of water is one of the severest environmental challenges threatening human health. Anion exchange material on the based polyvinylchloride have been demonstrated effective in dichromate ions removal. To study the structure morphology of the PPE-2 anion exchanger different characterization techniques such as XRD, FTIR, and SEM were applied. Moreover, the synthesized anion exchanger PPE-2 was used as effective removal for hexavalent chromium ions in aqueous media. The pseudo-first order and pseudo-second order used to evaluate the kinetic models and the mechanism of the adsorption. Results showed that the adsorption kinetics best fit the pseudo-second order model. The Freundlich isotherm and the pseudo-second order kinetic model were more consistent with the removal of ions from aqueous solutions. In the case of hexavalent chromium ions, the maximum adsorption capacity was 148,4 mg/g. Dubinin-Radushkevich (D-R) free energy of adsorption (ED) energy values were >16 kJ/mol which indicates chemical interaction between ion exchange material and Cr (VI) ions. Thermodynamic data revealed spontaneous endothermic processes and was a chemisorption reaction. In addition, results show that the anion exchanger (PPE-2) has high efficiency for removing hexavalent chromium ions from wastewater containing.
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