Abstract
ABSTRACT 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, Cr3+, and hexavalent chromium ions, Cr2O2 7. 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 SO2 4 ions and of the concentration of H+ ions in the solutions was also analyzed. Results showed the oxidation of the Cr3* ion at the anode and the reduction of the Cr2 7; 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.
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