Selective Capture of Toxic Selenite Anions by Bismuth-based Metal-Organic Frameworks

Huan Ouyang; Ning Chen; Guojing Chang; Xiaoliang Zhao; Yuanyuan Sun; Shuai Chen; Huawei Zhang; Dongjiang Yang

doi:10.1002/anie.201807891

Selective Capture of Toxic Selenite Anions by Bismuth-based Metal-Organic Frameworks

Angew Chem Int Ed Engl. 2018 Oct 1;57(40):13197-13201. doi: 10.1002/anie.201807891. Epub 2018 Sep 4.

Authors

Huan Ouyang¹, Ning Chen², Guojing Chang¹, Xiaoliang Zhao¹, Yuanyuan Sun¹, Shuai Chen³, Huawei Zhang⁴, Dongjiang Yang¹

Affiliations

¹ Collaborative Innovation Center for Marine Biomass Fibers Materials and Textiles of Shandong Province, School of Environmental Science and Engineering, Qingdao University, Qingdao, 266071, P. R. China.
² Canadian Light Source, Saskatoon, S7N 0X4, Canada.
³ State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Science, Taiyuan, 030001, P. R. China.
⁴ College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, P. R. China.

PMID: 30047202
DOI: 10.1002/anie.201807891

Abstract

Chemically durable and effective absorbent materials for selenite (SeO₃^2- ) remain highly desirable for contamination remediation. Now a bismuth-based metal-organic framework (Bi-MOF, CAU-17) was used as adsorbent to capture SeO₃^2- anions from aqueous solution with ultrahigh adsorption capacity of 255.3 mg g^-1 and fast kinetics. Furthermore, the adsorbent showed excellent selectivity for SeO₃^2- 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 SeO₃^2- 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.

Keywords: EXAFS spectroscopy; bismuth; metal-organic frameworks; selective capture; selenite.

Abstract

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