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Minerals 2018, 8(8), 346; https://doi.org/10.3390/min8080346

Metal Sequestration through Coupled Dissolution–Precipitation at the Brucite–Water Interface

1
German Research Centre for Geosciences (GFZ), Interface Geochemistry, 14473 Potsdam, Germany
2
Institut für Mineralogie, University of Münster, 48149 Münster, Germany
3
Department of Chemistry, The Institute for Geoscience Research (TIGeR), Curtin University, 6845 Perth, Australia
4
School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK
5
Department of Earth Sciences, Freie Universität Berlin, 12249 Berlin, Germany
*
Author to whom correspondence should be addressed.
Received: 18 July 2018 / Revised: 6 August 2018 / Accepted: 7 August 2018 / Published: 10 August 2018
(This article belongs to the Special Issue Mineral Surface Reactions at the Nanoscale)
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Abstract

The increasing release of potentially toxic metals from industrial processes can lead to highly elevated concentrations of these metals in soil, and ground- and surface-waters. Today, metal pollution is one of the most serious environmental problems and thus, the development of effective remediation strategies is of paramount importance. In this context, it is critical to understand how dissolved metals interact with mineral surfaces in soil–water environments. Here, we assessed the processes that govern the interactions between six common metals (Zn, Cd, Co, Ni, Cu, and Pb) with natural brucite (Mg(OH)2) surfaces. Using atomic force microscopy and a flow-through cell, we followed the coupled process of brucite dissolution and subsequent nucleation and growth of various metal bearing precipitates at a nanometer scale. Scanning electron microscopy and Raman spectroscopy allowed for the identification of the precipitates as metal hydroxide phases. Our observations and thermodynamic calculations indicate that this coupled dissolution–precipitation process is governed by a fluid boundary layer at the brucite–water interface. Importantly, this layer differs in composition and pH from the bulk solution. These results contribute to an improved mechanistic understanding of sorption reactions at mineral surfaces that control the mobility and fate of toxic metals in the environment. View Full-Text
Keywords: dissolution–precipitation; toxic metals; brucite; mineral–water interface dissolution–precipitation; toxic metals; brucite; mineral–water interface
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Hövelmann, J.; Putnis, C.V.; Benning, L.G. Metal Sequestration through Coupled Dissolution–Precipitation at the Brucite–Water Interface. Minerals 2018, 8, 346.

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