Transport of trivalent and hexavalent chromium through different ion-selective membranes in acidic aqueous media

Journal Article · Mon Jun 01 04:00:00 EDT 1998 · Separation Science and Technology

DOI:https://doi.org/10.1080/01496399808545245· OSTI ID:634701

Costa, R F.D.; Rodrigues, M A.S.; Ferreira, J Z ^[1]

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1. LACOR-PPGEM-UFRGS, Porto Alegre (Brazil)

The aim of this work was to evaluate the transport of trivalent and hexavalent chromium through anion- and cation-selective membranes using two- and three-compartment electrodialysis cells. Tests were done with acidic solutions of trivalent chromium ions, Cr{sup 3+}, and hexavalent chromium ions, Cr{sub 2}O{sub 7}{sup 2{minus}}. In each situation the transport of metallic ions through the membrane was evaluated. In the tests with trivalent chromium, Nafion 417 and Selemion CMT cation-selective membranes were used, and in the tests with hexavalent chromium, Selemion AMT membrane was used. The influence of SO{sub 4}{sup 2{minus}} ions and of the concentration of H{sup +} ions in the solutions was also analyzed. Results showed the oxidation of the Cr{sup 3+} ion at the anode and the reduction of the Cr{sub 2}O{sub 7}{sup 2{minus}} ion at the cathode. The maximum yield in the process was reached when hexavalent chromium solutions were used in the absence of sulfate ions and a Selemion AMT membrane in a three-compartment cell.

• Sponsoring Organization: USDOE
• OSTI ID: 634701
• Journal Information: Separation Science and Technology, Journal Name: Separation Science and Technology Journal Issue: 8 Vol. 33; ISSN 0149-6395; ISSN SSTEDS
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
CHROMIUM
ELECTRODIALYSIS
ION EXCHANGE MATERIALS
MATERIALS RECOVERY
MEMBRANE TRANSPORT
WASTE WATER
WATER TREATMENT