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Separations
Special Issues
Recent Advances in Separation and Recovery of Metals
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Recent Advances in Separation and Recovery of Metals

A special issue of Separations (ISSN 2297-8739). This special issue belongs to the section "Environmental Separations".

Deadline for manuscript submissions: closed (31 March 2024) | Viewed by 1601

Special Issue Editors

Prof. Dr. Laurent Dupont

E-Mail Website
Guest Editor
Reims Institute of Molecular Chemistry, The University of Reims Champagne Ardenne, Reims, France
Interests: ionic liquids; liquid–liquid extraction; coordination chemistry; metals; solution chemistry
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Aminou Mohamadou

E-Mail Website
Guest Editor
Reims Institute of Molecular Chemistry, The University of Reims Champagne Ardenne, Reims, France
Interests: ionic liquids; liquid–liquid extraction; coordination chemistry

Special Issue Information

Dear Colleagues,

In recent years, the need to develop new methodologies for the recovery of strategic and critical metals from various sources has become a necessity, in order to meet the ever-increasing demand from industry and to cope with the scarcity of primary resources. Environmental requirements call for the implementation of increasingly "green" processes, which has led to a growing interest in the scientific community in the development of new technologies for the recovery of noble and strategic metals.

In this context, the journal Separation, published by MDPI, has decided to devote a Special Issue to "Recent Advances in Separation and Recovery of Metals".

The objective of this Special Issue is to focus on the development of new methodologies for the recovery of critical and strategic metals.

Given your expertise in this field, I invite you to contribute to this Special Issue by submitting an original research paper. Your contribution will enable this Special Issue to make a significant impact on the scientific research community.

Prof. Dr. Laurent Dupont
Prof. Dr. Aminou Mohamadou
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Separations is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • liquid–liquid extraction
  • metals
  • ionic liquid
  • transition metals
  • heavy metal extraction
  • hydrometallurgy

Published Papers (1 paper)

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Research

18 pages, 3817 KiB  
Article
Separation of Co(II) and Ni(II) Using an Analog of Glycine-Betaine Based on Task-Specific Ionic Liquids
by Lamia Boulafrouh, Stéphanie Boudesocque, Aminou Mohamadou and Laurent Dupont
Separations 2023, 10(5), 305; https://doi.org/10.3390/separations10050305 - 11 May 2023
Viewed by 1255
Abstract
A series of salts based on ethyl ester glycine-betaine derivatives, viz tri(n-pentyl)[2-ethoxy-2-oxoethyl]ammonium bromide, have been synthesized. These cations generate hydrophobic ionic liquids (ILs) with bis(trifluoromethylsulfonyl)imide (Tf2N−) or dicyanamide (Dca−) anions. These new analogues of glycine-betaine-based [...] Read more.
A series of salts based on ethyl ester glycine-betaine derivatives, viz tri(n-pentyl)[2-ethoxy-2-oxoethyl]ammonium bromide, have been synthesized. These cations generate hydrophobic ionic liquids (ILs) with bis(trifluoromethylsulfonyl)imide (Tf2N−) or dicyanamide (Dca−) anions. These new analogues of glycine-betaine-based ionic liquids (AGB-ILs) were characterized using spectroscopic methods (IR, 1H, and 13C NMR) and elemental analysis. These AGB-ILs were used for the selective separation of Ni(II) and Co(II) in saline media using pure ILs phase or ILs diluted in organic solvent. Interestingly, extraction of Co(II) and Ni(II) in Dca-based AGB-ILs can be enhanced using salts with chaotropic anions such as NaNO3 (E > 90% for Co(II) and E = 85% for Ni(II)). Tf2N−-based ionic liquids do not extract Ni(II) or Co(II) even in NaCl 4M. Dca−-based ILs lead to a quasi-quantitative extraction of Co(II), while extraction of Ni(II) is limited to a few percent (17%) leading to separation factors higher than 100, ensuring a good separation of both metals. Cobalt could be back-extracted from the ionic liquid phase with water or with an aqueous solution of Na2SO4, which limits the release of the AGB cation in aqueous media, thus preserving its integrity. Results obtained by AGB-ILs diluted in organic solvent were comparable to those obtained with the pure AGB-ILs phase, indicating that this strategy can be deployed on systems working continuously out of equilibrium since the extraction mechanisms involve fast equilibria. Full article
(This article belongs to the Special Issue Recent Advances in Separation and Recovery of Metals)
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