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The trisulfur radical ion S 3 •− controls platinum transport by hydrothermal fluids

Abstract : Platinum group elements (PGE) are considered to be very poorly soluble in aqueous fluids in most natural hydrothermal–magmatic contexts and industrial processes. Here, we combined in situ X-ray absorption spectroscopy and solubility experiments with atomistic and thermodynamic simulations to demonstrate that the trisulfur radical ion S 3 •− forms very stable and soluble complexes with both Pt II and Pt IV in sulfur-bearing aqueous solution at elevated temperatures (∼300 °C). These Pt-bearing species enable (re)mobilization, transfer, and focused precipitation of platinum up to 10,000 times more efficiently than any other common inorganic ligand, such as hydroxide, chloride, sulfate, or sulfide. Our results imply a far more important contribution of sulfur-bearing hydrothermal fluids to PGE transfer and accumulation in the Earth’s crust than believed previously. This discovery challenges traditional models of PGE economic concentration from silicate and sulfide melts and provides new possibilities for resource prospecting in hydrothermal shallow crust settings. The exceptionally high capacity of the S 3 •− ion to bind platinum may also offer new routes for PGE selective extraction from ore and hydrothermal synthesis of noble metal nanomaterials.
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https://hal.archives-ouvertes.fr/hal-03323512
Contributor : Gleb Pokrovski Connect in order to contact the contributor
Submitted on : Monday, August 23, 2021 - 9:41:27 AM
Last modification on : Tuesday, October 19, 2021 - 11:02:11 PM

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Gleb Pokrovski, Maria Kokh, Elsa Desmaele, Clément Laskar, Elena Bazarkina, et al.. The trisulfur radical ion S 3 •− controls platinum transport by hydrothermal fluids. Proceedings of the National Academy of Sciences of the United States of America , National Academy of Sciences, 2021, 118 (34), pp.e2109768118. ⟨10.1073/pnas.2109768118⟩. ⟨hal-03323512⟩

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