Optimizing magnetic nanoparticles for drinking water technology: The case of Cr(VI).

Autor: Simeonidis K; Department of Mechanical Engineering, School of Engineering, University of Thessaly, Volos 38334, Greece. Electronic address: ksime@physics.auth.gr., Kaprara E; Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece., Samaras T; Department of Physics, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece., Angelakeris M; Department of Physics, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece., Pliatsikas N; Department of Physics, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece., Vourlias G; Department of Physics, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece., Mitrakas M; Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece., Andritsos N; Department of Mechanical Engineering, School of Engineering, University of Thessaly, Volos 38334, Greece.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2015 Dec 01; Vol. 535, pp. 61-8. Date of Electronic Publication: 2015 Apr 17.
DOI: 10.1016/j.scitotenv.2015.04.033
Abstrakt: The potential of magnetite nanoparticles to be applied in drinking water treatment for the removal of hexavalent chromium is discussed. In this study, a method for their preparation which combines the use of low-cost iron sources (FeSO4 and Fe2(SO4)3) and a continuous flow mode, was developed. The produced magnetite nanoparticles with a size of around 20 nm, appeared relatively stable to passivation providing a removal capacity of 1.8 μg Cr(VI)/mg for a residual concentration of 50 μg/L when tested in natural water at pH7. Such efficiency is explained by the reducing ability of magnetite which turns Cr(VI) to an insoluble Cr(OH)3 form. The successful operation of a small-scale system consisting of a contact reactor and a magnetic separator demonstrates a way for the practical introduction and recovery of magnetite nanoparticles in water treatment technology.
(Copyright © 2015 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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