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 - Institut des sciences de la Terre ( Grenoble) Accéder directement au contenu
Article Dans Une Revue Water Science and Technology Année : 2022

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

Fabrice Brunet
Delphine Tisserand
  • Fonction : Auteur
Martine Lanson
  • Fonction : Auteur
Mathieu Bertrand
  • Fonction : Auteur
Céline Bonnaud
  • Fonction : Auteur

Résumé

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.
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hal-03872540 , version 1 (25-11-2022)

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Fabrice Brunet, Delphine Tisserand, Martine Lanson, Benjamin Malvoisin, Mathieu Bertrand, et al.. 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. Water Science and Technology, 2022, 86 (3), pp.596-609. ⟨10.2166/wst.2022.210⟩. ⟨hal-03872540⟩
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