Enhanced pyrite passivation by carrier-microencapsulation using Fe-catechol and Ti-catechol complexes

Li, Xinlong; Park, Ilhwan; Tabelin, Carlito Baltazar; Naruwa, Kosuke; Goda, Taiki; Harada, Chie; Jeon, Sanghee; Ito, Mayumi; Hiroyoshi, Naoki

Enhanced pyrite passivation by carrier-microencapsulation using Fe-catechol and Ti-catechol complexes

Li, Xinlong; Park, Ilhwan; Tabelin, Carlito Baltazar et al.

Journal of hazardous materials, 2021, 416, 126089

Permalink : https://hdl.handle.net/2115/89224

このアイテムのアクセス数:432件（2026-08-16 19:49 集計）

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論文情報

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アクセス権	open access
URI	https://hdl.handle.net/2115/89224
タイトル	Enhanced pyrite passivation by carrier-microencapsulation using Fe-catechol and Ti-catechol complexes
著者	Li, Xinlong ; Park, Ilhwan ; Tabelin, Carlito Baltazar ; Naruwa, Kosuke ; Goda, Taiki ; Harada, Chie ; Jeon, Sanghee ; Ito, Mayumi ; Hiroyoshi, Naoki
著者名 Li, Xinlong
e-Rad_Researcher 80844753 著者名 Park, Ilhwan
著者名 Tabelin, Carlito Baltazar
著者名 Naruwa, Kosuke
著者名 Goda, Taiki
著者名 Harada, Chie
e-Rad_Researcher 20847701 著者名 Jeon, Sanghee
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
	Pyrite
	Carrier-microencapsulation
	Fe-catecholate complex
	Ti-catecholate complex
発行日	2021-08-15
出版者	Elsevier
収録物名	Journal of hazardous materials
巻(号)	416
ページ	126089
抄録	Acid mine drainage (AMD) formation is mainly caused by the oxidation of pyrite. Carrier-microencapsulation (CME) using metal-catecholate complexes has been proposed to passivate sulfide minerals by forming surfaceprotective coatings on their surfaces. Among the various metal-catecholate complexes, Ti-catecholate formed stable coatings having superior acid-resistance, but a thick enough passivating film required considerable time (ca. 14 days) to grow. Meanwhile, Fe-catecholates can form Fe-oxyhydroxide coatings within 2 days, however, they are less stable than Ti-based coating. To address these drawbacks of using a single metal-complex, this study investigated the concurrent use of Fe-catechol and Ti-catechol complexes for accelerating the formation of stable passivating coating on pyrite & nbsp;Compared with a single metal-complex system, the coating formation was significantly accelerated in mixed system. Linear sweep voltammetry showed the simultaneous decomposition of [Fe(cat)]+ and [Ti(cat)3]2 & ndash; as the main reason for improved coating formation. Electrochemical properties of coatings formed by single and mixed complex systems, confirmed by electrochemical impedance spectroscopy and cyclic voltammetry, indicated the coating formed in the mixed system had higher resistance and more electrochemically inert than the other cases. The simultaneous use of Fe-catechol and Ti-catechol complexes enhanced pyrite passivation by accelerating metal-complex decomposition and forming more stable coating composed of Fe2TiO5.
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	© <2021>. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://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.2021.126089