Author： Navarro R.
Publisher： Taylor & Francis Ltd
ISSN： 0736-6299
Source： Solvent Extraction and Ion Exchange, Vol.25, Iss.2, 2007-03, pp. : 273-297
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Abstract
Cyanex 921 (tri-octyl phosphine oxide) was immobilized on Amberlite XAD-7. The extractant impregnated resin (EIR) was very efficient at removing Zn(II) from HCl solutions (optimum found for 3 M HCl). The sorption strongly depended on the Cyanex 921 concentration in the EIR, and the temperature (the reaction being exothermic). The maximum sorption capacity was close to 15 mg Zn(II) g-1 EIR (i.e. 0.19 mol Zn(II) mol-1 Cyanex 921). The uptake kinetics were controlled by intraparticle diffusion (De: 0.44 10-12 m2 s-1). Zn(II) can be easily desorbed using a number of eluents (including water and 0.1 M solution of EDTA, HNO3, H2SO4, and Na2SO4), which maintained performance levels over 5 cycles.
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