Abstract
Cyphos IL 101 (tetradecyl(trihexyl)phosphonium chloride) was immobilized on Amberlite XAD-7. The extractant impregnated resin (EIR) was very efficient at removing Zn(II) from HCl solutions (optimum found between 2 and 4 M HCl). Metal ions were removed as anionic chlorocomplexes (ZnCl4 2−) by ion exchange mechanism. The sorption strongly depended on the Cyphos IL 101 concentration in the EIR. The maximum sorption capacity was close to 20 mg Zn(II) g−1 EIR (i.e. 0.40 mol Zn(II) mol−1 Cyphos IL 101). The uptake kinetics were controlled by intraparticle diffusion (De: 1.2 10−11 − 6 10−11 m2 min−1). Zn(II) can be easily desorbed using a number of eluents (including water and 0.1 M solution of HNO3, H2SO4, and Na2SO4), which maintained performance levels over 5 cycles.
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