Dynamic Adsorption Of In(Iii) And Fe(Iii) On Solvent Impregnated Resins Containing Trioctylmethylammonium Chloride

Solvent impregnated resins (SIRs) were prepared by dry impregnation using styrene-divinylbenzene type macroreticular resin (HZ-818) as support and trioctylmethylammonium chloride as extractant. Adsorption and separation performance of In(III) and Fe(III) with SIRs was studied on HCl medium by static and dynamic adsorption method. The effect of HCl concentration on the adsorption of In(III) and Fe(III) was investigated by static adsorption method. The effect of feed flow rate, bed height, and metal ion concentration (In(III) and Fe(III)) was investigated by dynamic adsorption method. The optimized acidity for In(III) and Fe(III) adsorption with SIRs was 4 mol/L HCl in single-component and bi-component systems containing In(III) and Fe(III). The dynamic adsorption study revealed that when the concentration of HCl, feed flow rate, bed height, and metal ion concentration were 4 mol/L, 1.4 mL/min, 140 mm, and 90 mg/L at ambient temperature, the adsorption capacities of In(III) and Fe(III) in single-component system were 13.1 and 37.8 mg/g, respectively, and the adsorption capacities of In(III) and Fe(III) in bi-component system were 1.3 and 35.8 mg/g, respectively. Hence, SIRs could selectively adsorb Fe(III), and the separation of In(III) and Fe(III) in HCl solution could be achieved.