Abstract
In this work, we study the abiotic re-mineralization of ferrihydrite under reducing conditions, obtained by adding zero-valent iron (ZVI) to a suspension of ferrihydrite particles. Under similar conditions, the system (ferrihydrite and ZVI) proceeded along two different transformation pathways differentiated by whether a magnetic stirrer or an overhead stirrer was used for mixing. X-ray diffraction characterization of the solid products showed that magnetite was the sole product of ferrihydrite transformation when a magnetic stirrer was used, whereas both goethite and magnetite were formed when an overhead stirrer was used. The system also behaved differently in terms of transformation kinetics and amount of magnetite formed. The quantification of magnetite generated was performed using a procedure developed in this study. The role of four mechanisms was investigated to explain these observed differences, namely—(1) presence/absence of high local Fe2+ concentrations, (2) mechanical abrasion, (3) presence/absence of a magnetic field, and (4) presence/absence of a crystalline ZVI surface. Ferrous ions are expected to be concentrated near the magnetic bead on the magnetic stirrer as opposed to a more dispersed distribution with the overhead stirrer. This mechanistic study concluded that the presence of high local Fe2+ concentrations in the system leads to magnetite formation and the absence of the same leads to mixed goethite/magnetite or magnetite-free systems. These findings have significant implications for the mobilization of arsenic from iron (III) hydroxides as the conditions move from oxidizing to reducing, such as often occurs in engineered landfills and natural carbon-rich sediments.
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Acknowledgments
This work was supported by the National Institute of Environmental Health Sciences (NIEHS) Grant No. P42 ES04940. The authors declare that they have no conflict of interest. This paper’s contents are solely the responsibility of the authors and do not necessarily represent the official views of NIEHS. The authors wish to thank Phil Anderson of the University Spectroscopic Imaging Facility at the University of Arizona for performing the XRD analyses. The authors also wish to acknowledge the work of an undergraduate student, I-Tso Chen, who assisted with sample preparation for XRD analysis, and microwave digestions for aqueous iron analysis.
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Raghav, M., Sáez, A.E. & Ela, W.P. Understanding abiotic ferrihydrite re-mineralization by ferrous ions. Int. J. Environ. Sci. Technol. 12, 1945–1956 (2015). https://doi.org/10.1007/s13762-014-0599-7
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DOI: https://doi.org/10.1007/s13762-014-0599-7