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Extraction of Se(iv) and Se(vi) from aqueous HCl solution by using a diamide-containing tertiary amine
Here, we investigated the mechanism underlying the extraction of Se(iv) and Se(vi) from aqueous HCl solutions by N-2-ethylhexyl-bis(N-di-2-ethylhexyl-ethylamide)amine (EHBAA). In addition to examining extraction behavior, we also elucidated structural properties of the dominant Se species in solutio...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10243184/ https://www.ncbi.nlm.nih.gov/pubmed/37288380 http://dx.doi.org/10.1039/d3ra01341c |
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author | Narita, Hirokazu Maeda, Motoki Tokoro, Chiharu Suzuki, Tomoya Tanaka, Mikiya Shiwaku, Hideaki Yaita, Tsuyoshi |
author_facet | Narita, Hirokazu Maeda, Motoki Tokoro, Chiharu Suzuki, Tomoya Tanaka, Mikiya Shiwaku, Hideaki Yaita, Tsuyoshi |
author_sort | Narita, Hirokazu |
collection | PubMed |
description | Here, we investigated the mechanism underlying the extraction of Se(iv) and Se(vi) from aqueous HCl solutions by N-2-ethylhexyl-bis(N-di-2-ethylhexyl-ethylamide)amine (EHBAA). In addition to examining extraction behavior, we also elucidated structural properties of the dominant Se species in solution. Two types of aqueous HCl solutions were prepared by dissolving a Se(IV) oxide or a Se(VI) salt. X-ray absorption near edge structure analyses revealed that Se(vi) was reduced to Se(iv) in 8 M HCl. Using 0.5 M EHBAA, ∼50% of Se(vi) was extracted from 0.5 M HCl. In contrast, Se(iv) was hardly extracted from 0.5 to 5 M HCl; however, at molar concentrations above 5 M, the extraction efficiency of Se(iv) increased drastically, reaching ∼85%. Slope analyses for the distribution ratios of Se(iv) in 8 M HCl and Se(vi) in 0.5 M HCl showed that apparent stoichiometries of Se(iv) or Se(vi) to EHBAA were 1 : 1 and 1 : 2, respectively. Extended X-ray absorption fine structure measurements revealed that the inner-sphere of the Se(iv) and Se(vi) complexes extracted with EHBAA was [SeOCl(2)] and [SeO(4)](2−), respectively. Together, these results indicate that Se(iv) is extracted from 8 M HCl with EHBAA via a solvation-type reaction, whereas Se(vi) is extracted from 0.5 M HCl via an anion-exchange-type reaction. |
format | Online Article Text |
id | pubmed-10243184 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-102431842023-06-07 Extraction of Se(iv) and Se(vi) from aqueous HCl solution by using a diamide-containing tertiary amine Narita, Hirokazu Maeda, Motoki Tokoro, Chiharu Suzuki, Tomoya Tanaka, Mikiya Shiwaku, Hideaki Yaita, Tsuyoshi RSC Adv Chemistry Here, we investigated the mechanism underlying the extraction of Se(iv) and Se(vi) from aqueous HCl solutions by N-2-ethylhexyl-bis(N-di-2-ethylhexyl-ethylamide)amine (EHBAA). In addition to examining extraction behavior, we also elucidated structural properties of the dominant Se species in solution. Two types of aqueous HCl solutions were prepared by dissolving a Se(IV) oxide or a Se(VI) salt. X-ray absorption near edge structure analyses revealed that Se(vi) was reduced to Se(iv) in 8 M HCl. Using 0.5 M EHBAA, ∼50% of Se(vi) was extracted from 0.5 M HCl. In contrast, Se(iv) was hardly extracted from 0.5 to 5 M HCl; however, at molar concentrations above 5 M, the extraction efficiency of Se(iv) increased drastically, reaching ∼85%. Slope analyses for the distribution ratios of Se(iv) in 8 M HCl and Se(vi) in 0.5 M HCl showed that apparent stoichiometries of Se(iv) or Se(vi) to EHBAA were 1 : 1 and 1 : 2, respectively. Extended X-ray absorption fine structure measurements revealed that the inner-sphere of the Se(iv) and Se(vi) complexes extracted with EHBAA was [SeOCl(2)] and [SeO(4)](2−), respectively. Together, these results indicate that Se(iv) is extracted from 8 M HCl with EHBAA via a solvation-type reaction, whereas Se(vi) is extracted from 0.5 M HCl via an anion-exchange-type reaction. The Royal Society of Chemistry 2023-06-06 /pmc/articles/PMC10243184/ /pubmed/37288380 http://dx.doi.org/10.1039/d3ra01341c Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/ |
spellingShingle | Chemistry Narita, Hirokazu Maeda, Motoki Tokoro, Chiharu Suzuki, Tomoya Tanaka, Mikiya Shiwaku, Hideaki Yaita, Tsuyoshi Extraction of Se(iv) and Se(vi) from aqueous HCl solution by using a diamide-containing tertiary amine |
title | Extraction of Se(iv) and Se(vi) from aqueous HCl solution by using a diamide-containing tertiary amine |
title_full | Extraction of Se(iv) and Se(vi) from aqueous HCl solution by using a diamide-containing tertiary amine |
title_fullStr | Extraction of Se(iv) and Se(vi) from aqueous HCl solution by using a diamide-containing tertiary amine |
title_full_unstemmed | Extraction of Se(iv) and Se(vi) from aqueous HCl solution by using a diamide-containing tertiary amine |
title_short | Extraction of Se(iv) and Se(vi) from aqueous HCl solution by using a diamide-containing tertiary amine |
title_sort | extraction of se(iv) and se(vi) from aqueous hcl solution by using a diamide-containing tertiary amine |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10243184/ https://www.ncbi.nlm.nih.gov/pubmed/37288380 http://dx.doi.org/10.1039/d3ra01341c |
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