Efficient removal of cationic and anionic radioactive pollutants from water using hydrotalcite-based getters
Description
Hydrotalcite (HT)-based materials are usually applied to capture anionic pollutants in aqueous solutions. Generally considered anion exchangers, their ability to capture radioactive cations is rarely exploited. In the present work, we explored the ability of pristine and calcined HT getters to effectively capture radioactive cations (Sr2+ and Ba2+) which can be securely stabilized at the getter surface. It is found that calcined HT outperforms its pristine counterpart in cation removal ability. Meanwhile, a novel anion removal mechanism targeting radioactive I– is demonstrated. This approach involves HT surface modification with silver species, namely, Ag2CO3 nanoparticles, which can attach firmly on HT surface by forming coherent interface. This HT-based anion getter can be further used to capture I– in aqueous solution. The observed I– uptake mechanism is distinctly different from the widely reported ion exchange mechanism of HT and much more efficient. As a result of the high local concentrations of precipitants on the getters, radioactive ions in water can be readily immobilized onto the getter surface by forming precipitates. The secured ionic pollutants can be subsequently removed from water by filtration or sedimentation for safe disposal. Overall, these stable, inexpensive getters are the materials of choice for removal of trace ionic pollutants from bulk radioactive liquids, especially during episodic environmental crisis.
Impact and interest:
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ID Code: | 222705 | ||||||||||
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Item Type: | Contribution to Journal (Journal Article) | ||||||||||
Refereed: | Yes | ||||||||||
ORCID iD: |
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Measurements or Duration: | 8 pages | ||||||||||
DOI: | 10.1021/acsami.6b04632 | ||||||||||
ISSN: | 1944-8244 | ||||||||||
Pure ID: | 33094580 | ||||||||||
Divisions: | Past > Institutes > Institute for Future Environments Past > QUT Faculties & Divisions > Science & Engineering Faculty |
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Funding: | |||||||||||
Copyright Owner: | Consult author(s) regarding copyright matters | ||||||||||
Copyright Statement: | This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au | ||||||||||
Deposited On: | 06 Nov 2021 16:02 | ||||||||||
Last Modified: | 01 May 2024 15:14 |
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