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Mystery of Ageing of „Zero-Valent Iron“ (ZVI)
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SYSNO ASEP 0475135 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Mystery of Ageing of „Zero-Valent Iron“ (ZVI) Author(s) Wouafo, M. T. (CM)
Donkeng Dazie, Joel (UFCH-W) RID, ORCID
Tchatchueng, J. B. (CM)
Noubactep, Ch. (DE)
Ludvík, Jiří (UFCH-W) RID, ORCIDSource Title XXXVII. Moderní elektrochemické metody. Sborník přednášek mezinárodní odborné konference. - Ústí nad Labem : Best servis, 2017 / Navrátil Tomáš ; Fojta Miroslav ; Schwarzová Karolína - ISBN 978-80-905221-5-2 Pages s. 261-265 Number of pages 5 s. Publication form Print - P Action Moderní elektrochemické metody /37./ Event date 15.05.2017 - 19.05.2017 VEvent location Jetřichovice Country CZ - Czech Republic Event type WRD Language eng - English Country CZ - Czech Republic Keywords zero-valent iron ; aging effect ; zinc ion removal Subject RIV CG - Electrochemistry OECD category Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis) Institutional support UFCH-W - RVO:61388955 UT WOS 000432424300058 Annotation So called „zero-valent iron“, (ZVI), is used for water treatment, or, more generally for
environmental remediation. In fact, the surface of the metallic iron powder in the presence of
water and oxygen cannot be considered as pure Fe0 but as a mixture of its corrosion products.
The remediation process occurs on the surface of these iron particles, hence, the degree of
„corrosion“ is crucial for the process itself. Therefore, investigation of „aging“ of ZVI is an
important prerequisite for deeper understanding of its activity.
In this work, the first results of the systematic study of aging of iron metal powder are
presented. The investigation was performed in batch conditions in aqueous buffered solutions
pH 4, 4.7, 5.5 and in the presence of air oxygen. Increasing and then decreasing concentration
of the Fe2+ ion in the solution appeared to be the important marker of aging process.
In the second part of the work, removal of Zn2+ ions using ZVI was investigated.
Electrochemical techniques, namely polarography and its differential pulse form (DPP) were
used for permanent monitoring of the presence of Fe2+ and Zn2+ ions in the studied solution.
Changing concentrations of both ions revealed that at pH 5.5 the optimum aging time of ZVI
for removal of Zn2+ from aqueous solution is 6 hours.Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2018
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