Separation Science and Technology, Vol.43, No.9-10, 2434-2459, 2008
Zinc(II) extraction from hydrochloric acid solutions using amberlite XAD-7 impregnated with Cyphos IL 101 (tetradecyl(trihexyl)phosphonium chloride)
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 4M HCl). Metal ions were removed as anionic chlorocomplexes (ZnCl42-) by ion exchange mechanism. The sorption strongly depended on the Cyphos IL 101 concentration in the EIR. The maximum sorption capacity was close to 20mg Zn(II) g-1 EIR (i.e. 0.40mol Zn(II) mol-1 Cyphos IL 101). The uptake kinetics were controlled by intraparticle diffusion (De: 1.2 10-11-6 10-11m2min-1). Zn(II) can be easily desorbed using a number of eluents (including water and 0.1M solution of HNO3, H2SO4, and Na2SO4), which maintained performance levels over 5 cycles.
Keywords:amberlite XAD-7;Cyphos IL 101 (tetradecyl(trihexyl) phosphonium chloride);impregnated resins;ionic liquids;isotherms;kinetics;Zn(II) extraction