Carla Rizzo
Carbohydrate-Supramolecular Gels: Adsorbents for Chromium(VI) Removal from Wastewater
Rizzo, Carla; Andrews, Jessica L.; Steed, Jonathan W.; D'Anna, Francesca
Authors
Abstract
Hypothesis: To overcome the contamination of water by heavy metals the adsorption of the pollutant on gel phases is an attractive solution since gels are inexpensive, potentially highly efficient and form a distinct phase while allowing diffusion of the contaminated water throughout the material. This work tests the chromium(VI) adsorbent capacity of new supramolecular gels for Chromium(VI) removal from wastewater. Experiments: First hydrophobic imidazolium salts of carbohydrate anions were synthesised as new gelators. Subsequently, they were dissolved in a solvent by heating and, after cooling overnight, to give the formation of supramolecular gels. The properties of the resulting gels, such as thermal stability, mechanical strength, morphology, rheology, and kinetics of gel formation, were studied as a function of gelator structure, gelation solvent and pollutant removal efficiency. Findings: Carbohydrate-derived gels showed the best removal capacity, i.e. 97% in 24 h. Interestingly, in one case, the reduction of chromium(VI) to chromium(III) also occurred after the adsorption process, and this phenomenon has been analysed using 1H NMR spectroscopy, IR spectroscopy, and SEM. The most efficient gel can reach an adsorption capacity of 598 mg/g in contrast to a value of 153 mg/g for the most effectively best hydrogels reported to date. The new gel can be also recycled up to 4 times. These findings suggest that these new, supramolecular hydrogels have potential applications in environmental remediation.
Citation
Rizzo, C., Andrews, J. L., Steed, J. W., & D'Anna, F. (2019). Carbohydrate-Supramolecular Gels: Adsorbents for Chromium(VI) Removal from Wastewater. Journal of Colloid and Interface Science, 548, 184-196. https://doi.org/10.1016/j.jcis.2019.04.034
Journal Article Type | Article |
---|---|
Acceptance Date | Apr 11, 2019 |
Online Publication Date | Apr 11, 2019 |
Publication Date | Jul 15, 2019 |
Deposit Date | Apr 12, 2019 |
Publicly Available Date | Apr 11, 2020 |
Journal | Journal of colloid and interface science. |
Electronic ISSN | 1095-7103 |
Publisher | Elsevier |
Peer Reviewed | Peer Reviewed |
Volume | 548 |
Pages | 184-196 |
DOI | https://doi.org/10.1016/j.jcis.2019.04.034 |
Public URL | https://durham-repository.worktribe.com/output/1304018 |
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Publisher Licence URL
http://creativecommons.org/licenses/by-nc-nd/4.0/
Copyright Statement
© 2019 This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
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