Capture of radioactive TcO 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, a nonradioactive surrogate of TcO. 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 with high uptake capacity of 437 mg g and prominent distribution coefficient of 5.0 × 10. The removal efficiency remains stable over a pH range of 3-12 and allows selective capture of ReO in the presence of excessive competing anions such as NO, CO, PO and SO with good removal efficiency for ReO in a simulated Hanford LAW Melter Recycle Stream. Anion exchange between the ReO in solution and the chloride ion in iCON plays dominant role in the adsorption of ReO. The iCON shows promise for effective removal of radioactive Tc from nuclear waste.
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| http://dx.doi.org/10.1021/acs.est.8b06244 | DOI Listing |
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