HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Engineering / Faculty of Engineering >
Peer-reviewed Journal Articles, etc >

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

Files in This Item:
JHM,344(2018),322-332.pdf1.55 MBPDFView/Open
Please use this identifier to cite or link to this item:

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
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
Type: article (author version)
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)

Submitter: Tabelin, Carlito Baltazar

Export metadata:

OAI-PMH ( junii2 , jpcoar_1.0 )

MathJax is now OFF:


 - Hokkaido University