Formation of Nanosilver from Silver Sulfide Nanoparticles in Natural Waters by Photoinduced Fe(II, III) Redox Cycling

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

	Formation of Nanosilver from Silver Sulfide Nanoparticles in Natural Waters by Photoinduced Fe(II, III) Redox Cycling
	Li, Lingxiangyu; Zhou, Qunfang; Geng, Fanglan; Wang, Yawei; Jiang, Guibin
刊名	ENVIRONMENTAL SCIENCE & TECHNOLOGY
	2016-12-20
卷号	50 期号:24 页码:13342-13350
英文摘要	Nanosilver (nAg) has been repeatedly demonstrated to end up as silver sulfide nanoparticles (Ag(2)SNPs), but little is known about the potential transformations of Ag(2)SNPs in natural environments that are very important for comprehensive assessments of nAg risks to human and environmental health. Here we show that Ag(2)SNPs can release tiny amounts of silver ion via cation exchange reactions between Ag(I) and Fe(III) in the dark, while in the light dramatic dissolution of Ag2SNP occurs, which is mainly attributed to the Ag2SNP oxidation by the hydroxyl radical formed during the reduction of Fe(III) to Fe(II) in water under sunlit conditions. However, silver ions are subsequently reduced to nAg in the light due to the strong reducing power of Fe(II). Thus, the formation of nAg from Ag(2)SNPs in the presence of Fe(III) under light conditions proceeds through a two-step reaction mechanism, the photoinduced and Fe(III)-dependent dissolution of Ag(2)SNPs, followed by the reduction of silver ions to nAg by Fe(II). The formation of nAg from Ag(2)SNPs is also validated in environmental waters under light conditions. It is thus concluded that photoinduced Fe(III)/Fe(II) redox cycling can drive the formation of nAg from Ag(2)SNPs in natural waters. These findings suggest that the previous consensus about the stability of Ag(2)SNPs in aquatic environments should be reconsidered.
收录类别	SCI
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/35859]
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	Li, Lingxiangyu,Zhou, Qunfang,Geng, Fanglan,et al. Formation of Nanosilver from Silver Sulfide Nanoparticles in Natural Waters by Photoinduced Fe(II, III) Redox Cycling[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2016,50(24):13342-13350.
APA	Li, Lingxiangyu,Zhou, Qunfang,Geng, Fanglan,Wang, Yawei,&Jiang, Guibin.(2016).Formation of Nanosilver from Silver Sulfide Nanoparticles in Natural Waters by Photoinduced Fe(II, III) Redox Cycling.ENVIRONMENTAL SCIENCE & TECHNOLOGY,50(24),13342-13350.
MLA	Li, Lingxiangyu,et al."Formation of Nanosilver from Silver Sulfide Nanoparticles in Natural Waters by Photoinduced Fe(II, III) Redox Cycling".ENVIRONMENTAL SCIENCE & TECHNOLOGY 50.24(2016):13342-13350.