Polyvinylchloride-based anion exchanger for efficient removal of chromium (VI) from aqueous solutions

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.

Automated summary

Chemical modification of polyvinylchloride with polyethylenepolyamine produces anion exchange resin (PPE-1). Characterization techniques indicate weak base amino groups and microporous structure in PPE-1, which effectively removes hexavalent chromium ions from aqueous media. Adsorption kinetics follow a pseudo-second order model and Freundlich isotherm, with a maximum adsorption capacity of 218.4 mg/g for hexavalent chromium ions. Thermodynamic data suggest spontaneous endothermic processes and a chemisorption reaction, with PPE-1 showing 98% removal efficiency for hexavalent chromium ions in wastewater.