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Suppression of the release of arsenic from arsenopyrite by carrier-microencapsulation using Ti-catechol complex
This item is licensed under:Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
| Title: | Suppression of the release of arsenic from arsenopyrite by carrier-microencapsulation using Ti-catechol complex |
| Authors: | Park, Ilhwan Browse this author | | Tabelin, Carlito Baltazar Browse this author | | Magaribuchi, Kagehiro Browse this author | | Seno, Kensuke Browse this author | | Ito, Mayumi Browse this author →KAKEN DB | | Hiroyoshi, Naoki Browse this author →KAKEN DB |
| Keywords: | Acid mine drainage | | Arsenic | | Arsenopyrite | | Microencapsulation | | Ti-catechol complex |
| Issue Date: | 17-Feb-2020 |
| Publisher: | Elsevier |
| Journal Title: | Journal of Hazardous Materials |
| Volume: | 344 |
| Start Page: | 322 |
| End Page: | 332 |
| Publisher DOI: | 10.1016/j.jhazmat.2017.10.025 |
| Abstract: | 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. |
| Rights: | ©2018, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International https://creativecommons.org/licenses/by-nc-nd/4.0/ | | https://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/76743 |
| 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: Tabelin, Carlito Baltazar
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