Selective Capture of Toxic Selenite Anions by Bismuth‐based Metal–Organic Frameworks |
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| Authors: | Huan Ouyang Dr. Ning Chen Guojing Chang Xiaoliang Zhao Yuanyuan Sun Dr. Shuai Chen Prof. Huawei Zhang Prof. Dongjiang Yang |
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| Affiliation: | 1. Collaborative Innovation Center for Marine Biomass Fibers Materials and Textiles of Shandong Province, School of Environmental Science and Engineering, Qingdao University, Qingdao, P. R. China;2. Canadian Light Source, Saskatoon, Canada;3. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Science, Taiyuan, P. R. China;4. College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao, P. R. China |
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| Abstract: | Chemically durable and effective absorbent materials for selenite (SeO32?) remain highly desirable for contamination remediation. Now a bismuth‐based metal–organic framework (Bi‐MOF, CAU‐17) was used as adsorbent to capture SeO32? anions from aqueous solution with ultrahigh adsorption capacity of 255.3 mg g?1 and fast kinetics. Furthermore, the adsorbent showed excellent selectivity for SeO32? 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 SeO32? 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. |
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| Keywords: | bismuth EXAFS spectroscopy metal– organic frameworks selective capture selenite |
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