Oxidation of As-III by several manganese oxide minerals in absence and presence of goethite

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 土壤环境科学实验室

	Oxidation of As-III by several manganese oxide minerals in absence and presence of goethite
	Ruan, HD; Liu, F; Tan, WF; Feng, XH; He, JZ
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2006
卷号	80 期号:2 页码:249-256
关键词	Mn Oxide Mineral Goethite Oxidation As-iii As-v
英文摘要	Oxidation of As-III by three types of manganese oxide minerals affected by goethite was investigated by chemical analysis, equilibrium redox, X-ray diffraction (XRD) and transmission electron microscopy (TEM). Three synthesized Mn oxide minerals of different types, birnessite, todorokite, and hausmannite, could actively oxidize As-III to As-V, and greatly varied in their oxidation ability. Layer structured birnessite exhibited the highest capacity of As-III oxidation, followed by the tunnel structured todorokite. Lower oxide hausmannite possessed much low capacity of As-III oxidation, and released more Mn2+ than birnessite and todorokite during the oxidation. The maximum amount of As-V produced during the oxidation of As-III by Mn oxide minerals was in the order: birnessite (480.4 mmol/kg) > todorokite (279.6 mmol/kg) > hausmannite (117.9 mmol/kg). The oxidation capacity of the Mn oxide minerals was found to be relative to the composition, crystallinity, and surface properties. In the presence of goethite oxidation of As-III by Mn oxide minerals increased, with maximum amounts of As-V being 651.0 mmol/kg for birnessite, 332.3 mmol/kg for todorokite and 159.4 mmol/kg for hausmannite. Goethite promoted As-III oxidation on the surface of Mn oxide minerals through adsorption of the As-V produced, incurring the decrease of As-V concentration in solutions. Thus, the combined effects of the oxidation (by Mn oxide minerals)-adsorption (by goethite) lead to rapid oxidation and immobilization of As in soils and sediments and alleviation of the As-III toxicity in the environments.
WOS记录号	WOS:000237430400015
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/23067]
专题	生态环境研究中心_土壤环境科学实验室
推荐引用方式 GB/T 7714	Ruan, HD,Liu, F,Tan, WF,et al. Oxidation of As-III by several manganese oxide minerals in absence and presence of goethite[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2006,80(2):249-256.
APA	Ruan, HD,Liu, F,Tan, WF,Feng, XH,&He, JZ.(2006).Oxidation of As-III by several manganese oxide minerals in absence and presence of goethite.ACTA GEOLOGICA SINICA-ENGLISH EDITION,80(2),249-256.
MLA	Ruan, HD,et al."Oxidation of As-III by several manganese oxide minerals in absence and presence of goethite".ACTA GEOLOGICA SINICA-ENGLISH EDITION 80.2(2006):249-256.