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Sulfate-accelerated photochemical oxidation of arsenopyrite in acidic systems under oxic conditions: Formation and function of schwertmannite
Jun Hong; Lihu Liu; Ziwei Zhang; Xiange Xia; Li Yang; Zengping Ning; Chengshuai Liu; Guohong Qiu
2022
Source PublicationJournal of Hazardous Materials
Volume433Pages:128716
Abstract

The weathering of arsenopyrite is closely related to the generation of acid mine drainage (AMD) and arsenic (As) pollution. Solar radiation can accelerate arsenopyrite oxidation, but little is known about the further effect of SO42− on the photochemical process. Here, the photooxidation of arsenopyrite was investigated in the presence of SO42− in simulated AMD environments, and the effects of SO42− concentration, pH and dissolved oxygen on arsenopyrite oxidation were studied as well. SO42− could accelerate the photooxidation of arsenopyrite and As(III) through complexation between nascent schwertmannite and As(III). Fe(II) released from arsenopyrite was oxidized to form schwertmannite in the presence of SO42–, and the photooxidation of arsenopyrite occurred through the ligand-to-metal charge-transfer process in schwertmannite–As(III) complex along with the formation of reactive oxygen species in the presence of O2. The photooxidation rate of arsenopyrite first rose and then fell with increasing SO42− concentration. In the pH range of 2.0–4.0, the photooxidation rate of arsenopyrite progressively increased in the presence of SO42−. This study reveals how SO42− promotes the photooxidation of arsenopyrite and As release in the AMD environment, and improves the understanding of the transformation and migration of As in mining areas.

KeywordArsenopyrite Photochemical Oxidation Acid Mine Drainage Sulfate Schwertmannite
DOI10.1016/j.jhazmat.2022.128716
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Indexed BySCI
Language英语
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Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/13605
Collection环境地球化学国家重点实验室
Affiliation1.Key Laboratory of Fertilization from Agricultural Wastes, Ministry of Agriculture and Rural Affairs, Institute of Plant Protection and Soil Fertilizer, Hubei Academy of Agricultural Sciences, Wuhan 430070, Hubei Province, China
2.College of Resources and Environment, Interdisciplinary Sciences Institute, Huazhong Agricultural University, Wuhan 430070, Hubei Province, China
3.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, Guizhou Province, China
Recommended Citation
GB/T 7714
Jun Hong,Lihu Liu,Ziwei Zhang,et al. Sulfate-accelerated photochemical oxidation of arsenopyrite in acidic systems under oxic conditions: Formation and function of schwertmannite[J]. Journal of Hazardous Materials,2022,433:128716.
APA Jun Hong.,Lihu Liu.,Ziwei Zhang.,Xiange Xia.,Li Yang.,...&Guohong Qiu.(2022).Sulfate-accelerated photochemical oxidation of arsenopyrite in acidic systems under oxic conditions: Formation and function of schwertmannite.Journal of Hazardous Materials,433,128716.
MLA Jun Hong,et al."Sulfate-accelerated photochemical oxidation of arsenopyrite in acidic systems under oxic conditions: Formation and function of schwertmannite".Journal of Hazardous Materials 433(2022):128716.
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