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  • Selective extraction of chromium (VI) from multicomponent acidic solutions by emulsion liquid membranes using tributhylphosphate as carrier.

Selective extraction of chromium (VI) from multicomponent acidic solutions by emulsion liquid membranes using tributhylphosphate as carrier.

Journal of hazardous materials (2010-03-17)
Recep Ali Kumbasar
ABSTRACT

The facilitated extraction of Cr(VI) through an emulsion liquid membrane (ELM) was investigated, using tributyl phosphate (TBP) as mobile carrier. The emulsion liquid membrane phase consists of kerosene as diluent, TBP as carrier, SPAN 80 as surfactant and (NH(4))(2)CO(3) solution as stripping phase. The extraction of chromium (VI) has been studied under various experimental conditions and have been determined the influences of surfactant concentration, extractant concentration, stripping solution base concentration, mixing speed, phase ratio, treatment ratio, chromium (VI) and HCl concentrations of the feed solution. It was observed that the extraction rate of Cr(VI) was affected by changes of surfactant concentration, extractant concentration, stripping solution base concentration, and mixing speed. The results obtained showed that by appropriate selection of the extraction and stability conditions, nearly all of chromium (VI) ions present in the feed solution were extracted within 2-4 min. The separation factors of chromium (VI) with respect to cobalt, nickel, copper, cadmium and zinc ions, based on initial feed concentration, have experimentally determined.

MATERIALS
Product Number
Brand
Product Description

Tri-n-butyl phosphate, European Pharmacopoeia (EP) Reference Standard
Sigma-Aldrich
Tributyl phosphate, ≥99%
Sigma-Aldrich
Tributyl phosphate, 97%
Sigma-Aldrich
Tributyl phosphate, puriss., ≥99.0% (GC)
Supelco
Tributyl phosphate, for extraction analysis, ≥99.0% (GC)
Supelco
Tributyl phosphate, Pharmaceutical Secondary Standard; Certified Reference Material