REAL-TIME MONITORING OF AQUEOUS HG 2+ REDUCTION DYNAMICS BY MAGNETITE / IRON METAL COMPOSITE POWDERS SYNTHESIZED HYDROTHERMALLY SHORT TITLE: AQUEOUS HG 2+ REDUCTION DYNAMICS BY MAGNETITE / ZVI POWDER
| Autor: | Brunet, Fabrice, Tisserand, Delphine, Lanson, Martine, Malvoisin, Benjamin, Bertrand, Mathieu, Bonnaud, Céline |
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| Přispěvatelé: | Institut des Sciences de la Terre (ISTerre), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel-Université Grenoble Alpes (UGA), Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-PRES Université de Grenoble-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Hg reduction kinetics
ZVI Hg removal Steel-industry wastes ZVI Hg removal CV-AAS Hg reduction kinetics Steel-industry wastes [SDU]Sciences of the Universe [physics] [CHIM.MATE]Chemical Sciences/Material chemistry [CHIM.INOR]Chemical Sciences/Inorganic chemistry [SDE.ES]Environmental Sciences/Environmental and Society CV-AAS |
| Zdroj: | Water Science and Technology Water Science and Technology, 2022, 86 (3), pp.596-609. ⟨10.2166/wst.2022.210⟩ |
| ISSN: | 0273-1223 |
| DOI: | 10.2166/wst.2022.210⟩ |
| Popis: | International audience; An iron-based powder material composed of zerovalent iron (8 wt.%) and magnetite (92 wt.%), has been synthesized hydrothermally at 200 °C from zero-valent iron. Its effect on the reduction of aqueous Hg 2+ into gaseous Hg 0 has been investigated at ambient conditions for pH comprised between 4 and 8.5. The production of Hg 0 was monitored with an online mercury vapor analyzer at the picogram level for concentrations of iron-based composite of a few tenths of mg L-1. Starting from a solution containing Hg 2+ concentration of 25 ng L-1 at pH = 4, a succession of two Hg 0 production events was recorded. The first event is related to the Hg 2+ reduction by ZVI which fully dissolved within the first hours. Upon ZVI consumption, pH drifted towards the pH window where magnetite can efficiently reduce Hg 2+ at the hour timescale, resulting in a second Hg 0 production peak. The combined use of ZVI and magnetite to remove aqueous Hg 2+ by formation of Hg 0 (volatile) under mild acidic pH allows (1) to maximize the Hg 2+ reduction rate and (2) to take benefit of the longer lifetime of magnetite compared to ZVI. |
| Databáze: | OpenAIRE |
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