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Enhanced pyrite passivation by carrier-microencapsulation using Fe-catechol and Ti-catechol complexes
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| Title: | Enhanced pyrite passivation by carrier-microencapsulation using Fe-catechol and Ti-catechol complexes |
| Authors: | Li, Xinlong Browse this author | | Park, Ilhwan Browse this author →KAKEN DB | | Tabelin, Carlito Baltazar Browse this author | | Naruwa, Kosuke Browse this author | | Goda, Taiki Browse this author | | Harada, Chie Browse this author | | Jeon, Sanghee Browse this author →KAKEN DB | | Ito, Mayumi Browse this author →KAKEN DB | | Hiroyoshi, Naoki Browse this author →KAKEN DB |
| Keywords: | Acid mine drainage | | Pyrite | | Carrier-microencapsulation | | Fe-catecholate complex | | Ti-catecholate complex |
| Issue Date: | 15-Aug-2021 |
| Publisher: | Elsevier |
| Journal Title: | Journal of hazardous materials |
| Volume: | 416 |
| Start Page: | 126089 |
| Publisher DOI: | 10.1016/j.jhazmat.2021.126089 |
| Abstract: | 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. |
| Rights: | © <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/ | | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/89224 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: Park Ilhwan
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