Amberlite IRC-718 ion chelating resin extraction of hazardous metal Cr (VI) from aqueous solutions: equilibrium and theoretical modeling

Abstract

Under varied conditions, the IRC 718 ion-exchange resin is used to extract chromium (VI) ions from aqueous solutions. On chromium (VI) removal effectiveness, the effects of adsorption dosage, contact time, beginning metal concentration, and pH were examined. The batch ion exchange process reached equilibrium after around 90 minutes of interaction. With an initial chromium (VI) concentration of 0.5 mg/dm3, the pH-dependent ion-exchange mechanism revealed maximal removal in the pH 2.0–10 range. The adsorption mechanism occurs between Cr (VI) determined as the electron acceptor, and IRC 718 determined as the electron donor. The equilibrium ion-exchange potential and ion transfer quantities for Amberlite IRC 718 were calculated using the Langmuir adsorption isotherm model. The overall ion exchange capacity of the resin was determined to be 187.72 mg of chromium (VI)/g of resin at an ideal pH of 6.0. HIGHLIGHTS Amberlite IRC 718 is efficient at extracting and recovering chromium from wastewaters.; Chelating resin could remove Cr (VI) from a single aqueous solution containing initial metal ion concentrations ranging from 0.162 × 10−3 to 10.3 × 10−3 M at room temperature.; Chelating sorption closely matched the Langmuir model isotherm.; The monolayer adsorption capacities of these ion metals at the interface were 187.72 mg/g of resin.;

Keywords

• adsorption isotherm
• chromium (vi)
• ion exchange
• irc 718