Effect of Silver Particles Electrodeposited on Reticulated Vitreous Carbon for Nitrate Reduction

Abstract

The electrocatalytic activity of silver particles electrodeposited on reticulated vitreous carbon (RVC) was evaluated for nitrate reduction. Different morphologies of silver deposits were obtained by varying the deposition potential, AgNO 3 concentration solution, and deposition time. Silver deposit was not uniform due to the three-dimensional shaped electrode. The more elevated regions on the surface present a more intense deposition. The lowest silver ion concentration of 5 mM associated to the lowest deposition time of 10 s provided the most uniform Ag deposition. The electrocatalytic activities for nitrate reduction were improved for electrodes with Ag deposited at potential of -0.3 V, time of 60 s and silver ion concentrations of 10 and 20 mM, probably due to the connection between Ag dendrites and Ag nanoparticles that increased the electrode surface area.

Evaluating the Physisorption and Chemisorption of Iodine on Bismuth-Functionalized Carbon Foams

“…After a 60 min deposition (BCF-60), clusters within the dense 5 mm region were 11.08 μm and were 52.3 μm at the boundary. This pattern of particle grown has been reported in literature with electrodeposition on 3D carbon structures …”

“…This pattern of particle grown has been reported in literature with electrodeposition on 3D carbon structures. 41 The iodine capture capacity of the CF and BCFs was evaluated using static iodine loading under saturated conditions. 19,42 The results were compared against a silverexchanged faujasite reference material called IONEX Ag-400 (Ag 0 X from Molecular Products).…”

A closed-loop electrogenerative recycling process for recovery of silver from a diluted cyanide solution

“…9 These characteristics allow operations that produce relatively high current per unit of cell volume. 10,11 Some authors have reported the use of 3D electrodes to improve the overall electrochemical performance in which the electrode overpotential is controlled by mass transport phenomena. [11][12][13] However, all of these treatments (known as electrolytic cells) require power consumption and a high cost of the treatment process, especially for dilute sample solutions.…”

“…10,11 Some authors have reported the use of 3D electrodes to improve the overall electrochemical performance in which the electrode overpotential is controlled by mass transport phenomena. [11][12][13] However, all of these treatments (known as electrolytic cells) require power consumption and a high cost of the treatment process, especially for dilute sample solutions. In addition, dilute solutions of silver ion have low conductivities and side reactions tend to occur, thus reducing the efficiency of this system.…”