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Article Abstract
With the development of nuclear energy, the reprocessing of TcO/ReO has become a very difficult problem due to environmental issues such as high output, long life, and easy leakage. In this study, three extraction systems containing carbamic acid were introduced into the reprocessing of TcO/ReO for the first time. The results involving one of the three results show that -[,-di(2-ethylhexyl) aminocarbonylmethyl] glycine (D2EHAG) has ultrahigh selectivity for removal to TcO/ReO. When the extreme concentration ratio of SO and Cl to ReO of D2EHAG is 10,000:1, the distribution coefficient of ReO still reaches 12.73 and 2.67, respectively. Additionally, the most hydrophilic NO, when the extreme concentration ratio of NO and ReO is 1000:1, still has a distribution coefficient close to 2.33, which is more than the most reported MOF adsorption materials. Moreover, the reaction kinetics, stripping rate, and reuse rate were studied. After five cycles, the removal rate is still 98.12%, with a decrease of less than 0.7%. The system containing carbamic acid is a potential extraction removal system to remove TcO/ReO from nuclear radioactive wastewater.
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Article Synopsis
- The nuclear industry faces challenges with spent fuel reprocessing due to high acidity and salinity in contaminated sites, where existing sorbents for TcO sequestration perform poorly.
- Researchers developed a new sorbent by modifying a covalent organic framework (COF) with imidazole-based ionic liquids, enhancing its stability and efficiency.
- The new COF-polyILs composite demonstrates rapid adsorption of ReO (a TcO surrogate) in under 5 minutes, effectively removing it even in difficult acidic conditions and amid competing ions found in low-level radioactive waste streams.