期刊
ADVANCED SCIENCE
卷 6, 期 16, 页码 -出版社
WILEY
DOI: 10.1002/advs.201900547
关键词
covalent organic frameworks (COFs); coordination interactions; ion exchange; synergic effect; uranium adsorption
资金
- National Science Foundations of China [21871047, 21661001, U1832148]
- Natural Science Foundation of Jiangxi Province of China [20181ACB20003]
An ideal porous adsorbent toward uranium with not only large adsorption capacity and high selectivity but also broad applicability even under rigorous conditions is highly desirable but still extremely scarce. In this work, a porous adsorbent, namely [NH4](+)[COF-SO3-], prepared by ammoniating a SO3H-decorated covalent organic framework (COF) enables remarkable performance for uranium extraction. Relative to the pristine SO3H-decorated COF (COF-SO3H) with uranium adsorption capacity of 360 mg g(-1), the ammoniated counterpart of [NH4](+)[COF-SO3-] affords ultrahigh uranium uptake up to 851 mg g(-1), creating a 2.4-fold enhancement. Such a value is the highest among all reported porous adsorbents for uranium. Most importantly, a large distribution coefficient, K-d(U), up to 9.8 x 10(6) mL g(-1) is observed, implying extremely strong affinity toward uranium. Consequently, [NH4](+)[COF-SO3-] affords highly selective adsorption of uranium over a broad range of metal ions such as S-U/Cs = 821, S-U/Na = 277, and S-U/Sr = 124, making it as effective uranium adsorbent from seawater, resulting in amazing uranium adsorption capacity of 17.8 mg g(-1). Moreover, its excellent chemostability also make it an effective uranium adsorbent even under rigorous conditions (pH = 1, 8, and 3 m acidity).
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