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Complexation–Distribution Separated Solvent Extraction Process Designed for Rapid and Efficient Recovery of Inert Platinum Group Metals

[Image: see text] Previously, we have demonstrated that thermal-assisted techniques can accelerate the extraction of inert platinum group metals (PGMs), while they still have several concerns about difficulty of temperature control in actual extraction contactors and safety risks arising from heatin...

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Autores principales: Zheng, Zhiwei, Arai, Tsuyoshi, Takao, Koichiro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8388072/
https://www.ncbi.nlm.nih.gov/pubmed/34471783
http://dx.doi.org/10.1021/acsomega.1c03565
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author Zheng, Zhiwei
Arai, Tsuyoshi
Takao, Koichiro
author_facet Zheng, Zhiwei
Arai, Tsuyoshi
Takao, Koichiro
author_sort Zheng, Zhiwei
collection PubMed
description [Image: see text] Previously, we have demonstrated that thermal-assisted techniques can accelerate the extraction of inert platinum group metals (PGMs), while they still have several concerns about difficulty of temperature control in actual extraction contactors and safety risks arising from heating organic solvents. In this study, we report a complexation–distribution separated extraction process for the accelerated extraction of inert PGMs. This extraction method includes two steps: (1) complexation of PGMs with extractants in aqueous solution and (2) distribution of the formed complex from the aqueous phase to organic one. We separately investigated the complexation and distribution processes for typical inert PGMs such as Ru(III) and Rh(III) in the presence of water-soluble N,N,N′,N′-tetra-alkylpyridinediamide ligands (PDA) and bis(trifluoromethylsulfonyl)amide (Tf(2)N(–)) counteranions. As a result, the water-soluble complexes of Ru(III) and Rh(III) with PDA can be formed in 0.5 M HNO(3)(aq) within 3 h under heating at 356 K. The formed complexes were extracted to the 1-octanol layer containing Tf(2)N(–) within 5 min at room temperature, where this hydrophobic anion plays an important role to promote extraction of PGMs as an anionic phase-transfer catalyst (PTC). Consequently, we successfully established and demonstrated the complexation–distribution separated extraction process for the accelerated extraction of inert PGMs using a water-soluble ligand and anionic PTC.
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spelling pubmed-83880722021-08-31 Complexation–Distribution Separated Solvent Extraction Process Designed for Rapid and Efficient Recovery of Inert Platinum Group Metals Zheng, Zhiwei Arai, Tsuyoshi Takao, Koichiro ACS Omega [Image: see text] Previously, we have demonstrated that thermal-assisted techniques can accelerate the extraction of inert platinum group metals (PGMs), while they still have several concerns about difficulty of temperature control in actual extraction contactors and safety risks arising from heating organic solvents. In this study, we report a complexation–distribution separated extraction process for the accelerated extraction of inert PGMs. This extraction method includes two steps: (1) complexation of PGMs with extractants in aqueous solution and (2) distribution of the formed complex from the aqueous phase to organic one. We separately investigated the complexation and distribution processes for typical inert PGMs such as Ru(III) and Rh(III) in the presence of water-soluble N,N,N′,N′-tetra-alkylpyridinediamide ligands (PDA) and bis(trifluoromethylsulfonyl)amide (Tf(2)N(–)) counteranions. As a result, the water-soluble complexes of Ru(III) and Rh(III) with PDA can be formed in 0.5 M HNO(3)(aq) within 3 h under heating at 356 K. The formed complexes were extracted to the 1-octanol layer containing Tf(2)N(–) within 5 min at room temperature, where this hydrophobic anion plays an important role to promote extraction of PGMs as an anionic phase-transfer catalyst (PTC). Consequently, we successfully established and demonstrated the complexation–distribution separated extraction process for the accelerated extraction of inert PGMs using a water-soluble ligand and anionic PTC. American Chemical Society 2021-08-13 /pmc/articles/PMC8388072/ /pubmed/34471783 http://dx.doi.org/10.1021/acsomega.1c03565 Text en © 2021 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Zheng, Zhiwei
Arai, Tsuyoshi
Takao, Koichiro
Complexation–Distribution Separated Solvent Extraction Process Designed for Rapid and Efficient Recovery of Inert Platinum Group Metals
title Complexation–Distribution Separated Solvent Extraction Process Designed for Rapid and Efficient Recovery of Inert Platinum Group Metals
title_full Complexation–Distribution Separated Solvent Extraction Process Designed for Rapid and Efficient Recovery of Inert Platinum Group Metals
title_fullStr Complexation–Distribution Separated Solvent Extraction Process Designed for Rapid and Efficient Recovery of Inert Platinum Group Metals
title_full_unstemmed Complexation–Distribution Separated Solvent Extraction Process Designed for Rapid and Efficient Recovery of Inert Platinum Group Metals
title_short Complexation–Distribution Separated Solvent Extraction Process Designed for Rapid and Efficient Recovery of Inert Platinum Group Metals
title_sort complexation–distribution separated solvent extraction process designed for rapid and efficient recovery of inert platinum group metals
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8388072/
https://www.ncbi.nlm.nih.gov/pubmed/34471783
http://dx.doi.org/10.1021/acsomega.1c03565
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