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Photooxidation of Fe(II) to schwertmannite promotes As(III) oxidation and immobilization on pyrite under acidic conditions
Lihu Liu; Diman Guo; Guohong Qiu; Chengshuai Liu; Zengping Ning
2022
Source PublicationJournal of Environmental Management
Volume317Pages:115425
Abstract

Pollution of arsenic (As) in acid mine drainage (AMD) is a universal environmental problem. The weathering of pyrite (FeS2) and other sulfide minerals leads to the generation of AMD and accelerates the leaching of As from sulfide minerals. Pyrite can undergo adsorption and redox reactions with As, affecting the existing form and biotoxicity of As. However, the interaction process between As and pyrite in AMD under sunlight radiation remains unclear. Here, we found that the oxidation and immobilization of arsenite (As(III)) on pyrite can be obviously promoted by the reactive oxygen species (ROS) in sunlit AMD, particularly by radical dotOH. The reactions between hole-electron pairs and water/oxygen adsorbed on excited pyrite resulted in the production of H2O2radical dotOH and O2radical dot, and radical dotOH was also generated through the photo-Fenton reaction of Fe2+/FeOH2+. Weakly crystalline schwertmannite formed from the oxidation of Fe2+ ions by radical dotOH contributed much to the adsorption and immobilization of As. In the mixed system of pyrite (0.75 g L−1), Fe2+ (56.08 mg L−1) and As(III) (1.0 mg L−1) at initial pH 3.0, the decrease ratio of dissolved total As concentration was 1.6% under dark conditions, while it significantly increased to 69.0% under sunlight radiation. The existence of oxygen or increase in initial pH from 2.0 to 4.0 accelerated As(III) oxidation and immobilization due to the oxidation of more Fe2+ and production of more ROS. The present work shows that sunlight significantly affects the transformation and migration of As in AMD, and provides new insights into the environmental behaviors of As.

KeywordSulfide Mineral reactive Oxygen Species arsenic amd sunlight schwertmannite
DOI10.1016/j.jenvman.2022.115425
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Indexed BySCI
Language英语
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Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/13476
Collection环境地球化学国家重点实验室
Affiliation1.Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture and Rural Affairs, Hubei Key Laboratory of Soil Environment and Pollution Remediation, College of Resources and Environment, Interdisciplinary S
2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, Guizhou Province, China
Recommended Citation
GB/T 7714
Lihu Liu,Diman Guo,Guohong Qiu,et al. Photooxidation of Fe(II) to schwertmannite promotes As(III) oxidation and immobilization on pyrite under acidic conditions[J]. Journal of Environmental Management,2022,317:115425.
APA Lihu Liu,Diman Guo,Guohong Qiu,Chengshuai Liu,&Zengping Ning.(2022).Photooxidation of Fe(II) to schwertmannite promotes As(III) oxidation and immobilization on pyrite under acidic conditions.Journal of Environmental Management,317,115425.
MLA Lihu Liu,et al."Photooxidation of Fe(II) to schwertmannite promotes As(III) oxidation and immobilization on pyrite under acidic conditions".Journal of Environmental Management 317(2022):115425.
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