Electrochemical Deposition of Zero-Valent Iron from Alkaline Ceramic Suspensions of Fe2-xAlxO3 for Iron Valorisation
authors Lopes, DV; Kovalevsky, AV; Quina, MJ; Frade, JR
nationality International
journal JOURNAL OF THE ELECTROCHEMICAL SOCIETY
keywords HEMATITE PARTICLES; METAL PRODUCTION; OXIDE; REDUCTION; ELECTROREDUCTION; NANOPARTICLES; CONDUCTIVITY; ELECTROLYSIS; SOLUBILITY; ELECTRODES
abstract Electrochemical reduction of iron oxides into zero-valent iron (ZVI, Fe-0) is a promising alternative to the traditional methods used for iron production. The electrochemical deposition of Fe-0 from hematite and hematite-based Fe2-xAlxO3 ceramic in alkaline suspensions (10 M of NaOH) was assessed at relatively low temperature (90 degrees C). Ceramic compositions aimed to mimic the main components of red mud waste from the alumina refining industry for iron valorisation purposes. The impact of aluminium content on the electroreduction and microstructure of the deposited Fe-0 films was demonstrated and discussed. Trapping and following the leaching of the aluminium species during deposition causes drastic morphological changes and induces significant porosity. Faradaic efficiencies of the reduction to Fe-0 were found to decrease from 70% to 32% for Fe2O3 and Fe1.4Al0.6O3, respectively. The results highlight possible effects imposed by aluminium presence during Fe-0 electrodeposition for future iron recycling from, for example, red mud or other aluminium containing wastes by electrowinning in alkaline conditions. (C) 2020 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited.
publisher ELECTROCHEMICAL SOC INC
issn 0013-4651
isbn 1945-7111
year published 2020
volume 167
issue 10
digital object identifier (doi) 10.1149/1945-7111/ab9a2b
web of science category Electrochemistry; Materials Science, Coatings & Films
subject category Electrochemistry; Materials Science
unique article identifier WOS:000540280500001
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