Bulk liquid membrane for the recovery of chromium(VI) from a hydrochloric acid medium using dicyclohexano-18-crown-6 as extractant-carrier

被引：40

作者：

Zouhri, A

Ernst, B

Burgard, M ^{[1
]}

机构：

[1] Ecole Europeenne Chim Polymeres & Materiaux Stras, UMR 7512 CNRS, Lab Chim Minerale & Analyt, F-67087 Strasbourg, France

[2] Univ Ibnou Zohr, Fac Sci, Agadir, Morocco

来源：

SEPARATION SCIENCE AND TECHNOLOGY | 1999年 / 34卷 / 09期

关键词：

liquid membrane; chromium; extraction; transport; dicyclohexano-18-crown-6;

D O I：

10.1081/SS-100100745

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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(H3O+)CrO3Cl- in the organic phase. The Donnan equilibrium isotherm based on the extraction, stripping, and CrO3Cl- 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.

引用

页码：1891 / 1905

页数：15

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