Reticulated vitreous carbon electrode for copper(II) removal from dilute acid solutions: Effect of the dissolved oxygen

Reticulated vitreous carbon 45 pores per inch is adopted to deposit copper( II) from dilute solutions of 10-20 ppm to below 1 ppm. Three working potent ial values are tested: E = -0.4 V and E = -0.5 V, at which metal deposition is under diffusion control, and E = -0.25 V, at which the effect of O-2 re duction is limited, but deposition does not occur at its maximum rate. A th eoretical model, which takes into account the reabsorption of O-2 from air, is proposed to interpret the trend of faradic yield as the metal concentra tion in the solution becomes lower. The behavior of the system is correctly interpreted from the model when electrolyses are performed at E = -0.4 V.