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Cationic Covalent Organic Nanosheets for Rapid and Selective Capture of Perrhenate: An Analogue of Radioactive Pertechnetate from Aqueous Solution
Abstract
Capture of radioactive TcO 4 – from nuclear wastes is extremely desirable for waste disposal and environmental restoration. Here, we report the synthesis of hydrolytically stable cationic covalent organic nanosheets (iCON) for efficient uptake of ReO 4 –, a nonradioactive surrogate of TcO 4 – . The iCON combines cationic guanidine-based knots with hydroxyl anchored neutral edge units and chloride ions loosely bonded in the pores, rendering extremely fast exchange kinetics toward ReO 4 – with high uptake capacity of 437 mg g –1 and prominent distribution coefficient of 5.0 × 10 5 . The removal efficiency remains stable over a pH range of 3–12 and allows selective capture of ReO 4 – in the presence of excessive competing anions such as NO 3 –, CO 3 2–, PO 4 3– and SO 4 2– with good removal efficiency for ReO 4 – in a simulated Hanford LAW Melter Recycle Stream. Anion exchange between the ReO 4 – in solution and the chloride ion in iCON plays dominant role in the adsorption of ReO 4 – . The iCON shows promise for effective removal of radioactive 99 Tc from nuclear waste.
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Metadata
- Authors
- Da, H.-J., Yang, C.-X., & Yan, X.-P.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2019-04-01
- Volume
- 53
- Issue
- 9
- Pages
- 5212-5220
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W2929301186
- Cited by
- 268
- References
- 36
- FWCI
- 9.37
- Type
- journal article
- Language
- en
- Open access
- closed
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