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- Title
Post‐Modification of a Robust Covalent Organic Framework for Efficient Sequestration of <sup>99</sup>TcO<sub>4</sub><sup>−</sup>/ReO<sub>4</sub><sup>−</sup>.
- Authors
Zhu, Lei; Li, Hai‐Ruo; Liu, Zhao‐Fei; Di, Zhengyi; Xu, Wengui; Zhang, Libo; Li, Cheng‐Peng
- Abstract
Nuclear industry spent fuel reprocessing and some radioactive contamination sites often involve high acidity and salinity environments. Currently developed and reported sorbents in 99TcO4− sequestration from the nuclear waste are unstable and show low adsorption efficiency in harsh conditions. To address this issue, we developed a post‐synthetic modification strategy by grafting imidazole‐based ionic liquids (ILs) onto the backbone of covalent organic framework (COF) via vinyl polymerization. The resultant COF‐polyILs sorbent exhibits fast adsorption kinetics (<5 min) and good sorption capacity (388 mg g−1) for ReO4− (a nonradioactive surrogate of 99TcO4−). Outstandingly, COF‐polyILs composite shows superior ReO4− removal even under highly acidic conditions and in the presence of excess competing ions of Hanford low‐level radioactive waste stream, benefiting from the stable covalent bonds between the COF and polyILs, mass of imidazole rings, and hydrophobic pores in COF.
- Subjects
HANFORD (Calif.); ADSORPTION kinetics; RADIOACTIVE contamination; SORPTION; COVALENT bonds; NUCLEAR industry; RADIOACTIVE wastes
- Publication
Chemistry - A European Journal, 2023, Vol 29, Issue 60, p1
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.202302168