Naslov
STUDY OF ELECTROCHEMICAL ZINC RECOVERY PROCESS

Autori
Touabi Noura ; Bounoughaz Moussa ; Martinez Sanja

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, ostalo

Izvornik
6th ISE Satellite Student Regional Symposium on Electrochemistry, Book of Abstracts / Jozefina Katić - Zagreb : Fakultet kemijskog inženjerstva i tehnologije Sveučilišta u Zagrebu, 2016, 40-40

ISBN
978-953-6470-73-0

Skup
6th ISE Satellite Student Regional Symposium on Electrochemistry

Mjesto i datum
Zagreb, Hrvatska, 08.07.2016

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Domaća recenzija

Ključne riječi
zinc ; electrochemical recovery
(cink ; elektrokemijsko dobivanje)

Sažetak
Electrodeposition process is an applicable method for the recovery of metals under appropriate conditions. In the present work, zinc recovery by electrodeposition from acidic sulphate solution of pH3 has been studied by cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy. To accelerate the deposition chloride electrolyte NaCl was added. The effect of different variables such as: the scan rate, the inversion potential, the addition of zinc and the presence of copper on the current-potential curves, was investigated to characterize the effect of the process conditions on the deposition efficiency. The voltammograms showed proportionality between the current peaks and the concentration of zinc in solution. The effect of the scan rate on the voltammetric peaks showed that the Zn2+ reduction was an irreversible process which was controlled by diffusion and also by charge transfer kinetics. Zinc was also deposited potentiostatically, from pure zinc and zinc-copper solutions, on a graphite electrode with graphite auxiliary electrode and saturated calomel as a reference. Electrochemical impedance spectroscopy was done in potentiostatic mode in the potential range corresponding to zinc reduction to characterize the kinetics of nucleation of zinc deposits. The SEM images revealed the presence of copper in the surface of zinc deposits. With the increase of the concentration of copper the deposit become more delicate and brittle with dendritic structure.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

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