Skip to main navigation Skip to main content
info(at)avldigital.remove-this.de
Deutsch English
Last searches

Results for *

Displaying results 1 to 3 of 3.

  1. Ionogels as modular platform for metal extraction
    Author: Boudesocque, Stéphanie; Viau, Lydie; Nouali, Habiba; Dupont, Laurent
    Published: 2023
    Publisher:  HAL CCSD ; Elsevier

    International audience ; In this study, we have explored a strategy to develop new ionogels as materials for metal extraction. The methodology applied here consists, first, in confining a commercial salt tetrahexylammonium bromide [THN]Br in... more

     

    International audience ; In this study, we have explored a strategy to develop new ionogels as materials for metal extraction. The methodology applied here consists, first, in confining a commercial salt tetrahexylammonium bromide [THN]Br in silica-based ionogels in order to determine their extracting properties. Anionic metathesis was then carried out in-situ on the [THN]Br ionogels with sodium dicyanamide (NaDca) or lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) to enhance their extracting efficiency or to bring selectivity to the extraction process. Treatment of [THN]Br ionogels with those salts ensures a quasi-quantitative replacement of bromide ions by Dca− and TFSI−. The replacement of bromide anions was confirmed by thermogravimetric analyses (TGA) and Infra-Red spectroscopy. Nitrogen adsorption–desorption isotherms measured before and after metathesis allow us to confirm that no major structural modification has been induced by the anionic exchange.[THN]Br ionogels were used for the extraction of Au(III), Pt(IV), Co(II), and Cr(VI). Au(III), Pt(IV) and Cr(VI) were fully extracted while the extraction of Co(II) did not exceed a few percent. Treatment of [THN]Br ionogels with NaDca improved the extraction capabilities of the material with respect to Co(II) while treatment with LiTFSI allowed the separation of Au(III) from Pt(IV), with separation factors higher than 1000. It also increased the separation of Au(III) from Cu(II) compared to the brominated ionogel. The extraction performances of each ionogel were compared to those of the pure similar ionic liquid. This work shows that, starting from the same ionogel, the extracting properties can be modulated as desired by simple anion exchange.

     
    Export to reference management software   RIS file
      BibTeX file
    Source: BASE Selection for Comparative Literature
    Language: English
    Media type: Article (journal)
    Format: Online
    Parent title: ISSN: 1383-5866 ; Separation and Purification Technology ; https://hal.science/hal-04152244 ; Separation and Purification Technology, 2023, 322, pp.124285. ⟨10.1016/j.seppur.2023.124285⟩
    Subjects: Ionic liquid; Liquid–liquid extraction; Ionogel; Gold; Platinum; Cobalt; [CHIM.GENI]Chemical Sciences/Chemical engineering
    Rights:

    info:eu-repo/semantics/OpenAccess
  2. Ab-initio Beschreibung von Transportkoeffizienten in Co/Cu-Vielfachschichten
    Author: Hönemann, Albert Lucas
    Published: 2022
    Publisher:  Universitäts- und Landesbibliothek Sachsen-Anhalt, Halle (Saale)

    Export to reference management software   RIS file
      BibTeX file
    Source: Union catalogues
    Language: German
    Media type: Dissertation
    Format: Online
    Other identifier:
    Subjects: Spin-Sonde; Spin flip; Dichtefunktionalformalismus; Spinnen <Motiv>; Mehrschichtsystem; Spin-Spin-Wechselwirkung; Spin-Spin-Kopplungskonstante; Ab-initio-Rechnung; Cobalt; Kupfer
    Other subjects: Array; Array
    Scope: Online-Ressource
    Notes:

    Dissertation, Halle (Saale), Martin-Luther-Universität Halle-Wittenberg, 2022
  3. Islands of responsibility?
    corporate sourcing of artisanal cobalt in the Democratic Republic of Congo
    Author: Umpula, Emmanuel; Buxton, Abbi; Schwartz, Brendan
    Published: September 2021
    Publisher:  IIED, London

    Location:
    Fachinformationsverbund Internationale Beziehungen und Länderkunde
    Inter-library loan:
    No inter-library loan

    Location:
    German Institute for Global and Area Studies, Bibliothek
    Inter-library loan:
    Unlimited inter-library loan, copies and loan

    Location:
    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    Inter-library loan:
    No inter-library loan
    Export to reference management software   RIS file
      BibTeX file
    Content information
    Volltext (kostenfrei)
    Volltext (kostenfrei)
    Source: Union catalogues
    Language: English
    Media type: Ebook
    Format: Online
    ISBN: 9781784319151
    Series: Issue paper
    Subjects: Bergmann; Kleingewerbe; Schattenwirtschaft; Arbeitsbedingungen; Arbeitssicherheit; Cobalt; Kupfer; Politische Reform; Artisanal and small-scale mining (ASM); Democratic Republic of Congo (DRC); Cobalt; Mining; Informal economy
    Scope: 1 Online-Ressource (31 Seiten)