Affiliation:
1. Department of Molecular Imaging and Nuclear Medicine Tianjin Medical University Cancer Institute and Hospital National Clinical Research Centre for Cancer Tianjin's Clinical Research Centre for Cancer Key Laboratory of Cancer Prevention and Therapy Tianjin 300060 China
2. College of Chemistry Tianjin Key Laboratory of Structure and Performance for Functional Molecules Tianjin Normal University Tianjin 300387 China
Abstract
AbstractNuclear 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.
Funder
National Natural Science Foundation of China
Subject
General Chemistry,Catalysis,Organic Chemistry