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Selective Capture of Toxic Selenite Anions by Bismuth‐based Metal–Organic Frameworks
Author(s) -
Ouyang Huan,
Chen Ning,
Chang Guojing,
Zhao Xiaoliang,
Sun Yuanyuan,
Chen Shuai,
Zhang Huawei,
Yang Dongjiang
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201807891
Subject(s) - bismuth , extended x ray absorption fine structure , adsorption , metal organic framework , aqueous solution , xanes , selenium , chemistry , density functional theory , inorganic chemistry , crystal structure , materials science , crystallography , organic chemistry , computational chemistry , absorption spectroscopy , spectroscopy , physics , quantum mechanics
Chemically durable and effective absorbent materials for selenite (SeO 3 2− ) remain highly desirable for contamination remediation. Now a bismuth‐based metal–organic framework (Bi‐MOF, CAU‐17) was used as adsorbent to capture SeO 3 2− anions from aqueous solution with ultrahigh adsorption capacity of 255.3 mg g −1 and fast kinetics. Furthermore, the adsorbent showed excellent selectivity for SeO 3 2− and was able to work steadily in a broad pH range of 4–11. Density functional theory (DFT) calculation, XANES modeling, and EXAFS fitting suggested that SeO 3 2− anions were immobilized by forming Bi−O−Se bonds (T‐3 structural model) though splitting the O−Bi−O bond in the crystal structure, leading to a structural transformation of CAU‐17 in the solid state.