A study on the mechanism of magnetite formation based on iron isotope fractionation
2009 (English)In: EPD Congress 2009: proceedings of sessions and symposia sponsored by the Extraction and Processing Division (EPD) of The Minerals, Metals & Materials Society (TMS) / [ed] Stanley M. Howard, Warrendale, Pa.: Minerals, Metals & Materials Society, 2009, 829-836 p.Conference paper (Refereed)
Having knowledge of mechanism of magnetite formation is essential in a number of industrial processes including magnetite synthesis and corrosion of iron. In this study, magnetite nano-particle was synthesized via two different ways; coprecipitation of iron (II) and (III) and oxidation of ferrous hydroxide. The samples were characterized using X-ray diffraction (XRD), Mid-Far IR spectroscopy, scanning electron microscopy (SEM), chemical analysis for determination of Fe II/Fe III ratio and ICP-MS for iron isotopic ratio (56Fe/54Fe) measurement. Since fractionation of iron isotopes depends on reaction rate and bonding strength, interpretation of the isotopic data with respect to the possible mechanisms is discussed. No fractionation of iron isotopes was observed for the magnetite synthesized by coprecipitation, whilst magnetite formed from ferrous hydroxide showed higher abundance of '4Fe compared to 56Fe in the beginning of reaction, implying the significance of the following reaction: Fe (OH)2 (solid) < -- > [Fe (OH)]+(aq) + OH-.
Place, publisher, year, edition, pages
Warrendale, Pa.: Minerals, Metals & Materials Society, 2009. 829-836 p.
Research subject Chemistry of Interfaces
IdentifiersURN: urn:nbn:se:ltu:diva-37404Local ID: b6acf4c0-50e3-11de-afea-000ea68e967bISBN: 9780873397322ISBN: 873397320OAI: oai:DiVA.org:ltu-37404DiVA: diva2:1010902
TMS 2009 Annual Meeting and Exhibition : 15/02/2009 - 19/02/2009
Godkänd; 2009; 20090604 (andbra)2016-10-032016-10-03Bibliographically approved