Analysis of the use of copper electrode in a filter-press electrochemical reactor for the electrochemical reduction of Cr(VI)

In this work, the Cr(VI) electrochemical reduction by Cyclic Voltammetry (CV) and Linear Sweep Voltammetry (LSV), in acidic solutions and on a copper electrode, was studied. Cr(VI) reduction occurs in one step by a diffusive process at -230 mV / Ag/AgCl. The results obtained by LSV suggest a mass-transfer control for Cr(VI) reduction. The diffusion coefficient obtained for Cr(VI) was DHcro4 = 1.1×10-5 cm2 s-1. The polarization curves obtained in a Filter-Press Electrochemical Reactor (FPER) corroborate the mechanism obtained with smaller electrodes and this allowed determining the best electrolysis voltage (2.0 V). The electrolysis showed conversions up to 70%25 in 60 min for solutions with 110 ppm of Cr(VI) in batch recycle mode. Copyright The Electrochemical Society.

Acidic solutions; Ag/AgCl; Copper electrodes; Cr(salen); Cyclic voltammetry (CV); diffusion coefficients; Diffusive processes; Electrochemical reactors; Electrochemical reductions; Environmental electrochemistry; Linear sweep voltammetry (LSV); Mass transfer control; Bioelectric phenomena; Blood vessel prostheses; Chemistry; Chromium; Chromium compounds; Copper; Cyclic voltammetry; Electric reactors; Electrochemical electrodes; Electrochemistry; Electrodes; Electrolysis; Electrolytic reduction; Metallizing; Steel analysis; Vegetation; Voltammetry; Reduction

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