Removal of Ca(II) and Mg(II) ions from solutions to sulfonic cation exchanger based on plasticized polyvinylchloride

Abstract

The ion-exchange material was obtained by oxidation of the product of the interaction of polyvinyl chloride with an aqueous solution of calcium polysulfide. The structure of the resulting cation exchanger and metal-containing hybrid material was identified by IR spectroscopy and elemental analysis. The kinetics of absorption of metal ions in cation exchange resin was analyzed by using pseudo-first and pseudo-second order models. The rate constants in the adsorption process were calculated. According to the correlation coefficient, it was determined that the sorption process proceeds according to the laws of a pseudo-second order reaction. Based on the equilibrium sorption it was evaluated according to the isotherm models of Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich (D-R). The results showed that the absorption of Ca²⁺ and Mg²⁺ ions from aqueous solutions in cation exchange resin displays the best accordance with the Langmuir monomolecular theory. In addition, the results showed that the cation exchanger (PVC-SO₃H) effectively cleans river water from Ca²⁺ and Mg²⁺ ions for industrial enterprises.

GRAPHICAL ABSTRACT

Keywords:

• Polyvinylchloride
• sulfonic cation exchanger
• removal
• Cа(II) and Mg(II) ions
• ion exchange kinetics

Acknowledgments

The authors are thankful to the National University of Uzbekistan, and the Ministry Innovative Development of Uzbekistan for their support in conducting the experiments and characterization.

Disclosure statement

The authors declare to have no competing interests to declare that are relevant to the content of this article.

Ethics approval

The material is the author’s own original work which has not been published elsewhere and is not currently being considered for publication elsewhere. The authors declare that the research work has not been copied from anywhere and the research has been done in a truthful manner.

Data availability statement

All original measurement data can be made available on request from the authors.