Fabrication of manganese ferrite (MnFe2O4) microsphere-coated magnetic biochar composite for antimonate sequestration: Characterization, adsorption behavior, and mechanistic understanding
- Authors
- Lee, Seon Yong; Kim, Heegon; Jang, Haeseong; Hwang, Min-Jin; Lee, Ki Bong; Choi, Jae-Woo; Jung, Kyung-Won
- Issue Date
- 15-3월-2022
- Publisher
- ELSEVIER
- Keywords
- Spinel manganese ferrite microspheres; Magnetic biochar composite; Antimonate; Adsorption mechanisms; X-ray absorption spectroscopy
- Citation
- APPLIED SURFACE SCIENCE, v.578
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED SURFACE SCIENCE
- Volume
- 578
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/135198
- DOI
- 10.1016/j.apsusc.2021.152005
- ISSN
- 0169-4332
- Abstract
- A hierarchically structured manganese ferrite microsphere-coated magnetic biochar (BC) composite (MSMnFe2O4/MBC) was synthesized by a facile solvothermal process to remove Sb(V) from aqueous solutions. In addition to conventional analytical techniques (e.g., XRD, SEM, TEM, XPS), X-ray absorption spectroscopy (XAS) measurements, including X-ray absorption near edge structure and extended X-ray absorption fine structure, were employed to characterize the synthesized MS-MnFe2O4/MBC and to explore its mechanism of interaction with Sb(V) in aqueous solutions. Hierarchically structured single-phase MnFe2O4 microspheres composed of numerous nanocrystallites (6.5-7 nm) were successfully fabricated on the BC surface. The XAS analysis results indicated that MnFe2O4 microspheres consisted of Mn2+ and Fe3+ atoms and possessed a partially inverse spinel structure with an inversion degree of 0.4. After adsorption, the combined results of X-ray photoelectron spectroscopy and XAS analyses demonstrated that the valence state of the adsorbed Sb species was Sb(V), and that its interaction with MS-MnFe2O4/MBC was attributed to the inner-sphere surface complexation through bidentate mononuclear edge-sharing and bidentate binuclear corner-sharing. The high potential of the adsorbent for Sb(V) removal was demonstrated in two actual water matrices, viz., tap water and river water. Overall, the findings indicate that MS-MnFe2O4/MBC has excellent practical applicability for Sb(V) removal from contaminated water.
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Collections - College of Engineering > Department of Chemical and Biological Engineering > 1. Journal Articles
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