Abstract
The Bi2O3 films-based anodes were synthesized by electrodeposition of Bi on stainless steel substrate at constant current density and during different deposition times, fallowed by calcination, forming Bi2O3. The thickness of the films was determined by two methods: the observation under the microscope and by calculation from mass difference. Electrochemical proceses at the anodes were ivestigated by linear sweep voltammetry. At the anodes obtained within 2, 5, 10 and 15 minutes of deposition, two dyes, namely: Reactive Blue 19 and Crystal Violet, were decolorized by oxidation with ?OH radical, generated from H2O2 decomposition at the anodes. Decoloration times of the anodes varied, and the shortest one was achieved with the anode obtained during 5 minutes of deposition, with the film thickness of 2.5?0.3 ?m. The optimal H2O2 concentration for the dyes degradation was found to be 10 mmol dm-3.
Highlights
The Bi2O3 films-based anodes were synthesized by electrodeposition of Bi on stainless steel substrate at constant current density and during different deposition times, followed by calcination, forming Bi2O3
Bi2O3 based anodes were synthesized by electrodeposition of bismuth, followed by calcination to obtain Bi2O3 films
Dyes decoloration with the rest of the tested Bi2O3 anodes proceeded thorough an oxidation with the oxygen species, which was generated from H2O2 decomposition at the anodes surface
Summary
The Bi2O3 films-based anodes were synthesized by electrodeposition of Bi on stainless steel substrate at constant current density and during different deposition times, followed by calcination, forming Bi2O3. Anode material is a very important factor determining the extent of decoloration in electrochemical dye degradation processes [2,7,8,12,16,17,18]. It should possess several important characteristics: an inert surface with low adsorption properties which does not provide catalytically active sites for the adsorption of reactants in aqueous media (providing the formation of high concentration of OH from water discharge), high corrosion stability and high O2 evolution overvoltage
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