Mechanistic study for stibnite oxidative dissolution and sequestration on pyrite

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境化学与生态毒理学国家重点实验室

	Mechanistic study for stibnite oxidative dissolution and sequestration on pyrite
	Yan, Li; Chan, Tingshan; Jing, Chuanyong
刊名	ENVIRONMENTAL POLLUTION
	2020-07
卷号	262 页码:1-11
关键词	Antimony Pyrite Heterogeneous electron transfer Reactive oxygen species Fe2+/Fe3+ cycling
ISSN号	0269-7491
英文摘要	Stibnite (Sb2S3) dissolution and transformation on mineral surfaces are the fundamental steps controlling the fate of antimony (Sb) in the environment. The molecular-level understanding of Sb2S3-mineral-water interfacial reactions is of great importance. Herein, Sb2S3 oxidative dissolution and sequestration on pyrite (FeS2) were explored. The results show that FeS2 accelerated the rate of Sb2S3 oxidative dissolution by a factor of 11.4-fold under sunlight due to heterogeneous electron transfer. The electron transfer from Sb(2)S(3)to FeS2 separated photogenerated hole (h(+)) and electron (e(-)) pairs, facilitating the generation of hydroxyl radicals ((OH)-O-center dot) on Sb2S3 and FeS2, and superoxide radicals (O-2(center dot-)) on FeS2. Surface O-2(center dot-) was the dominant oxidant for Sb(III) oxidation with 91% contribution, as evidenced by radical trapping experiments. (OH)-O-center dot was preferentially adsorbed on Sb2S3, but was released with Sb2S3 dissolution, and subsequently contributable to Sb(III) oxidation in solution. The Sb(III) oxidation and sequestration on FeS2 surface coupled Fe2+/Fe3+ cycling and inhibited FeS2 dissolution, as evidenced by X-ray absorption near edge structure and X-ray photoelectron spectroscopy. The insights gained from this study further our understanding of Sb2S3 transformation and transport at the environmental mineral-water interfaces. (C) 2020 Elsevier Ltd. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/44730]
专题	生态环境研究中心_环境化学与生态毒理学国家重点实验室
推荐引用方式 GB/T 7714	Yan, Li,Chan, Tingshan,Jing, Chuanyong. Mechanistic study for stibnite oxidative dissolution and sequestration on pyrite[J]. ENVIRONMENTAL POLLUTION,2020,262:1-11.
APA	Yan, Li,Chan, Tingshan,&Jing, Chuanyong.(2020).Mechanistic study for stibnite oxidative dissolution and sequestration on pyrite.ENVIRONMENTAL POLLUTION,262,1-11.
MLA	Yan, Li,et al."Mechanistic study for stibnite oxidative dissolution and sequestration on pyrite".ENVIRONMENTAL POLLUTION 262(2020):1-11.