Lee, Seon Yong Kim, Hee gon Jang, Haeseong Hwang, Min-Jin Lee, Ki Bong Choi, Jae Woo Jung, Kyung Won 2024-01-19T12:33:06Z 2024-01-19T12:33:06Z 2022-01-10 2022-03 0169-4332 https://pubs.kist.re.kr/handle/201004/115621 A hierarchically structured manganese ferrite microsphere-coated magnetic biochar (BC) composite (MS-MnFe2O4/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. ？ 2021 Elsevier B.V. English Elsevier BV Fabrication of manganese ferrite (MnFe2O4) microsphere-coated magnetic biochar composite for antimonate sequestration: Characterization, adsorption behavior, and mechanistic understanding Article 10.1016/j.apsusc.2021.152005 1 Applied Surface Science, v.578 Applied Surface Science 578 N scie scopus 000729993700005 2-s2.0-85119973199 Chemistry, Physical Materials Science, Coatings & Films Physics, Applied Physics, Condensed Matter Chemistry Materials Science Physics Article FE HYDROLYTIC FLOCS EFFICIENT REMOVAL AQUEOUS-SOLUTION LOW-COST ULTRAFILTRATION MEMBRANE OXIDE NANOCOMPOSITES CATION DISTRIBUTION OXIDATION-STATE GRAPHENE OXIDE WASTE-WATER Adsorption mechanisms Antimonate Magnetic biochar composite Spinel manganese ferrite microspheres X-ray absorption spectroscopy