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    Extraction and transport of sulfate using macrocyclic squaramide receptors


    Qin, Lei and Vervuurt, Sacha J N and Elmes, Robert B.P. and Berry, Stuart N and Proschogo, Nicholas and Jolliffe, Katrina A. (2020) Extraction and transport of sulfate using macrocyclic squaramide receptors. Chemical Science, 11 (201). ISSN 2041-6539

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    Abstract

    The selective extraction of the hydrophilic sulfate ion from water is highly challenging because the high free energy of hydration of this ion makes it more difficult to extract than less hydrophilic ions such as chloride and nitrate. Lipophilic macrocyclic squaramide receptors 1 and 2 were synthesized. Receptor 2 efficiently extracted sulfate from aqueous sodium sulfate solutions into a chloroform phase, via exchange with nitrate ions, overcoming the Hofmeister bias. The resulting 2$SO4 2� complex was readily recycled through precipitation of BaSO4. Transport of sulfate across a bulk chloroform membrane by 2 was demonstrated across a wide pH range (pH 3.2–9.4) and in the presence of high concentrations of competing anions (chloride, nitrate and dihydrogenphosphate), opening the door to the use of 2 for the selective removal of sulfate from water across a range of applications.

    Item Type: Article
    Keywords: extraction; transport; sulfate; macrocyclic squaramide receptors;
    Academic Unit: Faculty of Science and Engineering > Chemistry
    Item ID: 13856
    Identification Number: https://doi.org/10.1039/c9sc04786g
    Depositing User: Robert Elmes
    Date Deposited: 22 Jan 2021 11:16
    Journal or Publication Title: Chemical Science
    Publisher: Royal Society of Chemistry
    Refereed: Yes
    URI:

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