Freezing Facilitates Formation of Silver Nanoparticles under Natural and Simulated Sunlight Conditions

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

	Freezing Facilitates Formation of Silver Nanoparticles under Natural and Simulated Sunlight Conditions
	Tan, Zhiqiang ; Guo, Xiaoru 1; Yin, Yongguang 1; Wang, Bowen 3; Bai, Qingsheng 1; Li, Xia 3; Liu, Jingfu 1; Jiang, Guibin 1
刊名	ENVIRONMENTAL SCIENCE & TECHNOLOGY
	2019-12-03
卷号	53 期号:23 页码:13802-13811
ISSN号	0013-936X
英文摘要	Freezing is essential in the light-mediated transformation of organic pollutants. However, the effects of the freezing process on the reduction of Ag(+)( )by natural organic matter (NOM) remains unclear, causing significant uncertainties in the natural formation of silver nanoparticles (AgNPs). This study investigated the sunlight-induced reduction of Ag+ by NOM under natural or controlled freezing processes. Natural (outdoor) freezing experiments demonstrated intense aggregation and precipitation of AgNPs in three aqueous media, including a NOM solution and two river water samples, under natural sunlight irradiation. Indoor experiments under simulated sunlight irradiation and controlled freezing processes showed that freezing at -20 degrees C and repeated freeze-thaw cycles (-20 to 4 degrees C) drastically accelerated the formation and growth of AgNPs compared to maintenance at 4 degrees C. Finally, under the natural freezing process, commercial AgNPs were found to influence the redox reduction of Ag+ probably through a reduction in dissolution rates and homoaggregation with AgNPs newly formed in the river water samples. Additionally, the enhancement effect of freezing on AgNP formation was confirmed in the presence of Ag+ and AgNPs both at environmentally relevant concentration levels, especially upon light irradiation. This work emphasizes the importance of freezing processes on the natural formation of AgNPs.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/42546]
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
作者单位	1.Chinese Acad Sci, State Key Lab Environm Chem & Ecotoxicol, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China 2.Liaoning Univ, Sch Environm Sci, Shenyang 110036, Liaoning, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Tan, Zhiqiang,Guo, Xiaoru,Yin, Yongguang,et al. Freezing Facilitates Formation of Silver Nanoparticles under Natural and Simulated Sunlight Conditions[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2019,53(23):13802-13811.
APA	Tan, Zhiqiang.,Guo, Xiaoru.,Yin, Yongguang.,Wang, Bowen.,Bai, Qingsheng.,...&Jiang, Guibin.(2019).Freezing Facilitates Formation of Silver Nanoparticles under Natural and Simulated Sunlight Conditions.ENVIRONMENTAL SCIENCE & TECHNOLOGY,53(23),13802-13811.
MLA	Tan, Zhiqiang,et al."Freezing Facilitates Formation of Silver Nanoparticles under Natural and Simulated Sunlight Conditions".ENVIRONMENTAL SCIENCE & TECHNOLOGY 53.23(2019):13802-13811.