A novel arsenic immobilization strategy via a two-step process: Arsenic concentration from dilute solution using schwertmannite and immobilization in Ca-Fe-AsO4 compounds

Park, Ilhwan; Ryota, Takashino; Yuto, Takeuchi; Tabelin, Carlito Baltazar; Phengsaart, Theerayut; Jeon, Sanghee; Ito, Mayumi; Hiroyoshi, Naoki

A novel arsenic immobilization strategy via a two-step process: Arsenic concentration from dilute solution using schwertmannite and immobilization in Ca-Fe-AsO4 compounds

Park, Ilhwan; Ryota, Takashino; Yuto, Takeuchi et al.

Journal of Environmental Management, 2021, 295, 113052

Permalink : https://hdl.handle.net/2115/89862

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アクセス権	open access
URI	https://hdl.handle.net/2115/89862
タイトル	A novel arsenic immobilization strategy via a two-step process: Arsenic concentration from dilute solution using schwertmannite and immobilization in Ca-Fe-AsO4 compounds
著者	Park, Ilhwan ; Ryota, Takashino ; Yuto, Takeuchi ; Tabelin, Carlito Baltazar ; Phengsaart, Theerayut ; Jeon, Sanghee ; Ito, Mayumi ; Hiroyoshi, Naoki
e-Rad_Researcher 80844753 著者名 Park, Ilhwan
著者名 Ryota, Takashino
著者名 Yuto, Takeuchi
著者名 Tabelin, Carlito Baltazar
著者名 Phengsaart, Theerayut
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	Arsenic immobilization
	Sorption/desorption
	concentration
	Schwertmannite
	Ferric arsenate
	Yukonite
	Johnbaumite
発行日	2021-10-01
出版者	Elsevier
収録物名	Journal of Environmental Management
巻(号)	295
ページ	113052
抄録	Acid mine drainage (AMD) with toxic arsenic (As) is commonly generated from the tailings storage facilities (TSFs) of sulfide mines due to the presence of As-bearing sulfide minerals (e.g., arsenopyrite, realgar, orpiment, etc.). To suppress As contamination to the nearby environments, As immobilization by Ca-Fe-AsO4 compounds is considered one of the most promising techniques; however, this technique is only applicable when As concentration is high enough (>1 g/L). To immobilize As from wastewater with low As concentration (-10 mg/L), this study investigated a two-step process consisting of concentration of dilute As solution by sorption/desorption using schwertmannite (Fe8O8(OH)8-2x(SO4)x; where (1 < x < 1.75)) and formation of Ca-Fe-AsO4 compounds. Arsenic sorption tests indicated that As(V) was well adsorbed onto schwertmannite at pH 3 (Qmax = 116.3 mg/g), but its sorption was limited at pH 13 (Qmax = 16.1 mg/g). A dilute As solution (-11.2 mg/L As) could be concentrated by sorption with large volume of dilute As solution at pH 3 followed by desorption with small volume of eluent of which pH was 13. The formation of Ca-Fe-AsO4 compounds from As concentrate solution (2 g/L As(V)) was strongly affected by temperature and pH. At low temperature (25-50 degrees C), amorphous ferric arsenate was formed, while at high temperature (95 degrees C), yukonite (Ca2Fe3-5(AsO4)3(OH)4-10.xH2O; where x = 2-11) and johnbaumite (Ca5(AsO4)3OH) were formed at pH 8 and 12, respectively. Among the synthesized products, johnbaumite showed strongest As retention ability even under acidic (pH < 2) and alkaline (pH > 9) conditions.
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 https://creativecommons.org/licenses/by-nc-nd/4.0/
PISSN	0301-4797
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.jenvman.2021.113052