Adsorption Equilibrium, Kinetics, Thermodynamics and Dynamic Separation of Magnesium and CalciumIons from Industrial Wastewater by New Strong Acid Cation Resin of SPVC

Dilfuza Nuriddinova; Farkhod Yusupov; Elyor Berdimurodov; Normahmat Yodgorov; Murod Mamanazarov

doi:10.21743/pjaec/2021.06.13

Authors

Dilfuza Nuriddinova Department of Natural Sciences, Karshi State University, Kuchabog 17, Karshi, 180100, Uzbekistan Author
Farkhod Yusupov Institute of General and Nonorganic Chemistry, Academy of the science of the Republic of Uzbekistan, Feruza 39, Mirzo Ulugbek, Tashkent, 100180, Uzbekistan Author
Elyor Berdimurodov Department of Natural Sciences, Karshi State University, Kuchabog 17, Karshi, 180100, Uzbekistan Author
Normahmat Yodgorov Institute of General and Nonorganic Chemistry, Academy of the science of the Republic of Uzbekistan, Feruza 39, Mirzo Ulugbek, Tashkent, 100180, Uzbekistan Author
Murod Mamanazarov Institute of General and Nonorganic Chemistry, Academy of the science of the Republic of Uzbekistan, Feruza 39, Mirzo Ulugbek, Tashkent, 100180, Uzbekistan Author

DOI:

https://doi.org/10.21743/pjaec/2021.06.13

Keywords:

Magnesium and calcium ions, Dynamic separation, Kinetics, Adsorption equilibrium, Strong acid cation resin

Abstract

In the research work, the adsorption equilibrium, kinetics, thermodynamics and dynamic separation of magnesium and calcium ions from industrial wastewater by new strong acid cation resin of SPVC (sulphonated polyvinylchloride) were investigated. The sorption capacity of the
studied resin was 3.78 mmol/g and 3.74 mmol/g for magnesium and calcium ions, respectively, according to Langmuir isotherm. It was found that the pseudo−first−order model was better fitted for the adsorption kinetics of magnesium and calcium ions on the resin. The dynamic separation results confirmed that the selected resin effectively separated magnesium and calcium ions from industrial wastewater in the dynamic condition. The change of the standard Gibbs free energy (G^o) and enthalpy (H^o), and entropy (S^o) were calculated. The obtained results confirmed that
the adsorption of magnesium and calcium ions on the selected resin is endothermic