Effects of thiol substitution in deep-eutectic solvents (DESs) as solvents for metal oxides

Giacomo Damilano (Corresponding Author), Antero Laitinen, Pia Willberg-Keyriläinen, Tiina Lavonen, Riina Häkkinen, Wim Dehaen, Koen Binnemans, Lauri Kuutti (Corresponding Author)

    Research output: Contribution to journalArticleScientificpeer-review

    4 Citations (Scopus)
    16 Downloads (Pure)

    Abstract

    This study deals with an investigation of how substitution of an alcohol group by a thiol group in mixtures of choline chloride with a series of bio-sourceable molecules affects the physico-chemical properties of the mixtures and their ability to dissolve metal oxides. All of the thiol mixtures studied showed a higher affinity and selectivity for late transition metals and the physical properties of the mixtures were improved compared to their alcohol analogues (i.e. lower viscosity, wider liquid range). The metal solubility was assessed via determination of the final concentration of the metal oxides dissolved in thiol mixtures via inductively coupled plasma optical emission spectroscopy (ICP-OES). The thiol function selectively improved the solubilities of the late transition metal oxides (i.e. copper and zinc), which are valuable metals often present as residue in industrial waste. The solubility of iron oxides was much lower than that of the valuable metals, which is a significant benefit in industrial applications. The different solubilization behaviour of metal oxides in the thiol and alcohol mixtures was further investigated via UV-vis absorption and infrared spectroscopy. This study allowed the potential of these deep-eutectic solvents for the selective recovery of metals to be assessed.

    Original languageEnglish
    Pages (from-to)23484-23490
    Number of pages7
    JournalRSC Advances
    Volume10
    Issue number39
    DOIs
    Publication statusPublished - 19 Jun 2020
    MoE publication typeA1 Journal article-refereed

    Fingerprint Dive into the research topics of 'Effects of thiol substitution in deep-eutectic solvents (DESs) as solvents for metal oxides'. Together they form a unique fingerprint.

    Cite this