The combined effect of cadmium and boric acid on the electrodeposition of zinc-nickel from a sulfate has been investigated. The presence of cadmium ion decreases zinc in the deposit. In solution, cadmium inhibits the zinc ion deposition and suppresses it when deposition potential value is more negative than −1.2 V. Low concentration of CdSO 4 reduces the anomalous nature of ZnNi deposit. Boric acid decreases current density and shifts potential discharge of nickel and hydrogen to more negative potential. The combination of boric acid and cadmium increases the percentage of nickel in the deposit. Boric acid and cadmium.
The electrodeposition of nickel with zinc in presence of boric acid was studied in order to determine the influence of the composition of the deposition solution on the properties of the obtained electrodeposits. The Ni / Zn concentrations ratio in solution determines the deposition mechanism and thus, the chemical composition and the electrochemical activity of the electrodeposited alloys. Boric acid decreases current density which minimizes anomalous deposition. The typical results from these acidic media are the formation of Ni-rich alloys (%Ni > 90) by a normal code position mechanism with a better electrochemical activity than Ni for the hydrogen evolution reaction HER reaction.Results show that it is possible to obtain alloys rich in either zinc or nickel, from an acidic solution containing boric acid. For Ni / Zn concentration ratios in the range of 1-3, Zn-rich alloys are obtained despite Zn is the less noble element and even when it is present at lower concentrations than Ni, confirming that at these conditions alloys are deposited by an anomalous deposition mechanism as reported by many researchers (1,2,3). Electrochemical oxidation of these Zn-rich alloys shows the presence of δ and γ phases of Zn-Ni and Ni, in proportions dependent on the electrode position conditions. For the highest Ni/Zn concentrations ratios, in the range between 80 and 1000, the formation of the alloy occurs by a normal deposit mechanism, resulting in Ni-rich alloys (%Ni >90). The electrochemical behaviour of these coatings is different from the zinc-rich coatings and no evidence of the presence of γand δ phases of ZnNi alloy. These Ni-rich alloys show an improvement in their behaviour as a cathode for the HER as compared with Ni and allow proposing them as potentially suitable materials for use as cathode materials in the hydrogen evolution reaction. 10.1149/04524.0079ecst ©The Electrochemical Society ECS Transactions, 45 (24) 79-85 (2013) 79 ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 169.230.243.252 Downloaded on 2015-03-03 to IP
This work presents the results of wastewater sludge treatment coming from a dismissed industrial site. Sludge sample was collected from an industrial site and treated with sulfuric acid to extract heavy metals (Cu, Ni, Cd and Zn) that are separated by electrodeposition. To determine the best extractive parameters we carried out a study on the effects of sulfuric acid concentration and solid to liquid ratio. To minimize power consumption during the electrodeposition, the cathode used was made in the same material as the extracted metal. In order to have deposition time as similar as possible, the cathode area used was adapted to the concentration of the respective metal. The recovery of each metal was made potentiostatically at different potentials. The results show that for 5g/L solid to liquid ratio more than 99,9% of heavy metals can be removed from the sludge by treating with 0,5M sulfuric acid in less than 2hours. The recovery of heavy metals by reduction was achieved at 99%. The solution, obtained after electrodeposition, contains metals concentrations in agreement with Algerian legislations.
Our technique consists on the recuperation of heavy metals such as Cu; Ni; Zn and Cd from an industrial wastewater by electrode position. The experiments were carried out in a cell of a capacity of 1 litre. The electrodes are made of stainless steel sheets for the cathode with a surface of 1dm2 and a grid anode of titanium coated with ruthenium oxide. The water flow (1) was constant and kept at a rate of 0, 35 l/min. The pH of the solution was at 1 for the removal of Cu; Ni; Zn and Cd. Different values of current densities are applied to remove elements. More than 98% of metal reduction was obtain and the solution obtained contains metals concentrations in agreement with Algerian legislations.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.