Open AccessAmmoniating Covalent Organic Framework (COF) for High‐Performance and Selective Extraction of Toxic and Radioactive Uranium Ions
Author(s) -
Xiong Xiao Hong,
Yu Zhi Wu,
Gong Le Le,
Tao Yuan,
Gao Zhi,
Wang Li,
Yin Wen Hui,
Yang Li Xiao,
Luo Feng
Publication year - 2019
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.201900547
Subject(s) - uranium , adsorption , extraction (chemistry) , porosity , chemistry , covalent organic framework , metal ions in aqueous solution , nuclear chemistry , partition coefficient , covalent bond , metal , inorganic chemistry , materials science , chromatography , organic chemistry , metallurgy
Abstract 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 [NH 4 ] + [COF‐SO 3 − ], prepared by ammoniating a SO 3 H‐decorated covalent organic framework (COF) enables remarkable performance for uranium extraction. Relative to the pristine SO 3 H‐decorated COF (COF‐SO 3 H) with uranium adsorption capacity of 360 mg g −1 , the ammoniated counterpart of [NH 4 ] + [COF‐SO 3 − ] 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 × 10 6 mL g −1 is observed, implying extremely strong affinity toward uranium. Consequently, [NH 4 ] + [COF‐SO 3 − ] 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).