Comparative study of the extraction of V(V) and V(IV) from hydrochloric acid solutions with D1(2 ethylhexyl) phosphoric acid

  • JO Ojo
  • AO Adebayo
  • OI Ojo
Keywords: Vanadium, Solvent Extraction, D2EHPA, Stoichometries.

Abstract

This study compared the extraction of V(V) and V(IV) from HCl solutions by di(2-ethylhexyl) phosphoric acid (D2EHPA) dissolved in n-hexane with that of tri-n-butyl phosphate (TBP) extractant reported  recently. The percentage vanadium extraction (E%) reached optimal levels of 78.0 and 83.3% for V(V)  andV(IV) respectively, at optimum pHs of 1.3 and 2.0 in that order. The extraction of both species was found to increase with D2EHPA concentration up to experimental log [D2EHPA] = -0.06 mol dm (i.e. 0.86 mol dm ). The extraction of V(V) occurred through an exothermic process at the temperature range  301-321 K and V(IV) followed a similar order. From the method of slope analysis, UV visible and infrared spectra measurements, the stoichometries of the extracted V(V) and V(IV) specieswere formulated asVO HR andVO(HR )  respectively. The study showed that V(IV) was adjudged to be better extracted than V(V) by D2EHPA under the prevailing experimental conditions.

Keywords:Vanadium, Solvent Extraction,D2EHPA; Stoichometries.

 

 

Published
2016-03-01
Section
Articles

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eISSN: 0794-4896