Suppression of the release of arsenic from arsenopyrite by carrier-microencapsulation using Ti-catechol complex

Park, Ilhwan; Tabelin, Carlito Baltazar; Magaribuchi, Kagehiro; Seno, Kensuke; Ito, Mayumi; Hiroyoshi, Naoki

Suppression of the release of arsenic from arsenopyrite by carrier-microencapsulation using Ti-catechol complex

Park, Ilhwan; Tabelin, Carlito Baltazar; Magaribuchi, Kagehiro et al.

Journal of Hazardous Materials, 2020, 344, 322-332

Permalink : https://hdl.handle.net/2115/76743

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アクセス権	open access
URI	https://hdl.handle.net/2115/76743
タイトル	Suppression of the release of arsenic from arsenopyrite by carrier-microencapsulation using Ti-catechol complex
著者	Park, Ilhwan ; Tabelin, Carlito Baltazar ; Magaribuchi, Kagehiro ; Seno, Kensuke ; Ito, Mayumi ; Hiroyoshi, Naoki
著者名 Park, Ilhwan
著者名 Tabelin, Carlito Baltazar
著者名 Magaribuchi, Kagehiro
著者名 Seno, Kensuke
e-Rad_Researcher 10339690 著者名 Ito, Mayumi
e-Rad_Researcher 50250486 著者名 Hiroyoshi, Naoki
言語	英語
キーワード	Acid mine drainage
	Arsenic
	Arsenopyrite
	Microencapsulation
	Ti-catechol complex
発行日	2020-02-17
出版者	Elsevier
収録物名	Journal of Hazardous Materials
巻(号)	344
ページ	322-332
抄録	Arsenopyrite is the most common arsenic-bearing sulfide mineral in nature, and its weathering contributes to acid mine drainage (AMD) formation and the release of toxic arsenic (As). To mitigate this problem, carrier-microencapsulation (CME) using titanium (Ti)-catechol complex (i.e., Ti-based CME) was investigated to passivate arsenopyrite by forming a protective coating. Ti4+ ion dissolved in sulfuric acid and catechol were used to successfully synthesize Ti(IV) tris-catecholate complex, [Ti(Cat)3]2−, which was stable in the pH range of 5–12. Electrochemical studies on the redox properties of this complex indicate that its oxidative decomposition was a one-step, irreversible process. The leaching of As from arsenopyrite was suppressed by CME treatment using the synthesized Ti-catechol complex. Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) indicate that this suppression was primarily due to the formation of an anatase (β-TiO2)-containing coating. Based on these results, a detailed 4-step mechanism to explain the decomposition of [Ti(Cat)3]2− and formation of TiO2 coating in Ti-based CME is proposed: (1) adsorption, (2) partial oxidation-intermediate formation, (3) non electrochemical dissociation, and (4) hydrolysis-precipitation. Keywords: Acid mine drainage, Arsenic, Arsenopyrite, Microencapsulation, Ti-catechol complex.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
権利情報	©2018, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International https://creativecommons.org/licenses/by-nc-nd/4.0/
PISSN	0304-3894
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.jhazmat.2017.10.025