Bulk liquid membrane for the recovery of chromium(VI) from a hydrochloric acid medium using dicyclohexano-18-crown-6 as extractant-carrier
- Univ. Ibnou Zohr, Agadir (Morocco). Faulte de Sciences
- Ecole Europeenne de Chimie, Polymeres et Materiaux, Strasbourg (France)
The solvent extraction and transfer of chromic acid from hydrochloric acid medium through a bulk liquid membrane containing dicyclohexano-18-crown-6 (L) were studied. Extraction experiments pointed out that chromium(VI) was coextracted with the chloride ion which formed the complex ion pair L(H{sub 3}O{sup +})CrO{sub 3}Cl{sup {minus}} in the organic phase. The Donnan equilibrium isotherm based on the extraction, stripping, and CrO{sub 3}Cl{sup {minus}} hydrolysis equilibria allowed prediction of the performance of the semipermeable membrane to concentrate chlorochromic acid in the receiving phase. Transport experiments confirmed the ability of the liquid membrane to recover chlorochromic acid in pure water. The transport kinetics was modeled by using the two-film theory applied to the liquid membrane.
- OSTI ID:
- 682253
- Journal Information:
- Separation Science and Technology, Journal Name: Separation Science and Technology Journal Issue: 9 Vol. 34; ISSN 0149-6395; ISSN SSTEDS
- Country of Publication:
- United States
- Language:
- English
Similar Records
Enrichment of zinc isotopes by a liquid membrane system using a crown ether
Synthesis and structural elucidation of novel uranyl-crown ether compounds isolated from nitric, hydrochloric, sulfuric, and acetic acids