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

G. Velasco-Martínez, S. Gutiérrez-granados, A. Alatorre-Ordaz, I Rodríguez-Torres
ECS Transactions, 3 (18) 57-60 (2007), 2007.


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 D(HCrO4-)= 1.1x10-5 cm^2 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% in 60 min for solutions with 110 ppm of Cr(VI) in batch recycle mode.