Redox-Active Two-Dimensional Covalent Organic Frameworks (COFs) for Selective Reductive Separation of
Yang Li1, Xinghua Guo1, Xiaofeng Li1
1College of Chemistry, Sichuan University, Key Laboratory of Radiation Physics & Technology, Ministry of Education, No. 29 Wangjiang Road, Chengdu, 610064, P. R. China.
Abstract:
We report the first example of 2D covalent organic framework nanosheets (Redox-COF1) for the selective reduction and in situ loading of valence-variable, redox-sensitive and long-lived radionuclides (abbreviated as VRL nuclides). Compared with sorbents based on chemical adsorption and physical adsorption, the redox adsorption mechanism of Redox-COF1 can effectively reduce the impact of functional group protonation under the usual high-acidity conditions in chemisorption, and raise the adsorption efficiency from the monotonous capture by pores in physisorption. The adsorption selectivity for UO2 2+ reaches up to unprecedented ca. 97 % at pH 3, more than for any analogous adsorbing material.
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