Extraction of iron with dibenzyl sulfoxide solution sorbed on silica gel

Abstract

The amount of dibenzyl sulfoxide (DBSO) sorbed on silica gel from toluene solutions was measured for different silica gel hydrophobization procedures and in dependence on the initial DBSO concentration in the solution. From silica gel impregnated with DBSO solution, the sulfoxide is washed out by hydrochloric acid even if the acid has been saturated by shaking with 0.05M solution of DBSO in toluene. The effect of HCl and DBSO concentrations on the recovery of iron was investigated both for liquid-liquid extraction and for extraction with the extractant solution sorbed on silica gel. The recoveries for the two cases are equal, which implies that the ratios of the activity coefficients of the reagent and of the extracted complex for the liquid-liquid extraction and for the extraction with the extractant sorbed on hydrophobized silica gel are the same.