Journal
CHEMOSPHERE
Volume 237, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2019.124489
Keywords
Ferrihydrite; Carbothermal synthesis; Magnetic adsorbent; X-ray absorption spectroscopy
Categories
Funding
- Japanese Society for the Promotion Science (JSPS) [17F17084]
- Japan Society for the Promotion of Science [19H01960, 18KK0296, 17H04582, 16K12627]
- SPring-8 [2018A1228, 2017A1798, 2018B1801, 2018A0148]
- Photon Factory [2018G575, 2018G089]
- Grants-in-Aid for Scientific Research [16K12627, 18KK0296, 17F17084] Funding Source: KAKEN
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The present study provides the starch-mediated carbothermal preparation of magnetic-responsible ferrihydrite (MFHP) based on Fe-rich precipitates which is recovered by mine drainage for immobilization of arsenate and antimonate in water. Fe K-edge X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) represented partial transformation from ferrihydrite to magnetite in MFHP due to the carbothermal reduction process, resulting in an effective saturation magnetism (= 19.2 emu/g). As and Sb K-edge EXAFS revealed that arsenate ion combines onto the surface of MFHP as inner-sphere binuclear bidentate surface complex, and antimonate forms inner-sphere mononuclear bidentate complex. In addition, the leachability by toxicity characteristic leaching procedure (TCLP) implies the environmental friendly preparation method for preparing magnetic-responsible adsorbents using mining waste. (C) 2019 Elsevier Ltd. All rights reserved.
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