Nanocomposite Pyrite–Greigite Reactivity toward Se(IV)/Se(VI)

A nanopyrite/greigite composite was synthesized by reacting FeCl3 and NaHS in a ratio of 1:2 (Wei et al. 1996). Following this procedure, the obtained solid phases consisted of 30–50 nm sized particles containing 28% of greigite (Fe2+Fe3+ 2S4) and 72% pyrite (FeS2). Batch reactor experiments were pe...

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Veröffentlicht in:	Environmental science & technology 2012-05, Vol.46 (9), p.4869-4876
Hauptverfasser:	Charlet, Laurent, Kang, Mingliang, Bardelli, Fabrizio, Kirsch, Regina, Géhin, Antoine, Grenèche, Jean-Marc, Chen, Fanrong
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Sprache:	eng
Schlagworte:	Applied sciences Earth sciences Earth, ocean, space Engineering and environment geology. Geothermics Exact sciences and technology Hydrogen-Ion Concentration Iron - chemistry Nanocomposites - chemistry Phase transitions Pollution Pollution, environment geology Radioactive wastes Reaction kinetics Selenium Compounds - chemistry Spectrum analysis Sulfides - chemistry Thermodynamics Wastes X-Ray Absorption Spectroscopy
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creator	Charlet, Laurent Kang, Mingliang Bardelli, Fabrizio Kirsch, Regina Géhin, Antoine Grenèche, Jean-Marc Chen, Fanrong
description	A nanopyrite/greigite composite was synthesized by reacting FeCl3 and NaHS in a ratio of 1:2 (Wei et al. 1996). Following this procedure, the obtained solid phases consisted of 30–50 nm sized particles containing 28% of greigite (Fe2+Fe3+ 2S4) and 72% pyrite (FeS2). Batch reactor experiments were performed with selenite or selenate by equilibrating suspensions containing the nanosized pyrite–greigite solid phase at different pH-values and with or without the addition of extra Fe2+. XANES-EXAFS spectroscopic techniques revealed, for the first time, the formation of ferroselite (FeSe2) as the predominant reaction product, along with elemental Se. In the present experimental conditions, at pH 6 and in equilibrium with Se0, the solution is oversaturated with respect to ferrosilite. Furthermore, thermodynamic computations show that reaction kinetics likely played a significant role in our experimental system.
doi_str_mv	10.1021/es204181q
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Furthermore, thermodynamic computations show that reaction kinetics likely played a significant role in our experimental system.</description><subject>Applied sciences</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Engineering and environment geology. 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Sci. Technol</addtitle><date>2012-05-01</date><risdate>2012</risdate><volume>46</volume><issue>9</issue><spage>4869</spage><epage>4876</epage><pages>4869-4876</pages><issn>0013-936X</issn><eissn>1520-5851</eissn><coden>ESTHAG</coden><abstract>A nanopyrite/greigite composite was synthesized by reacting FeCl3 and NaHS in a ratio of 1:2 (Wei et al. 1996). Following this procedure, the obtained solid phases consisted of 30–50 nm sized particles containing 28% of greigite (Fe2+Fe3+ 2S4) and 72% pyrite (FeS2). Batch reactor experiments were performed with selenite or selenate by equilibrating suspensions containing the nanosized pyrite–greigite solid phase at different pH-values and with or without the addition of extra Fe2+. XANES-EXAFS spectroscopic techniques revealed, for the first time, the formation of ferroselite (FeSe2) as the predominant reaction product, along with elemental Se. 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title	Nanocomposite Pyrite–Greigite Reactivity toward Se(IV)/Se(VI)
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