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
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: |
|
| Use Licence: |
This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available
here |
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