Reduction of hexavalent chromium by copper |
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Authors: | S Goeringer NR de Tacconi CR Chenthamarakshan K Rajeshwar |
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Affiliation: | (1) Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX 76019-0065, USA |
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Abstract: | The galvanic reaction of metallic copper in Cr(VI)-laden aqueous solutions of varying pH was examined by in situ u.v.–visible spectrophotometry, rotating disc electrode chronopotentiometry and cyclic voltammetry. The galvanic reaction in 0.2 M H2SO4 solutions was pseudo first order in Cr(VI) concentration. Experiments with both magnetically stirred solutions and a copper mesh or a copper film in a rotating disc electrode configuration revealed the reaction to be diffusion-controlled with respect to Cr(VI) transport to the copper surface. Finally, cyclic voltammetry data in Cr(VI)-laden media of varying pH underline the important role of protons in the galvanic reaction. |
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Keywords: | environmental remediation first-order kinetics mass transport medium pH |
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