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Freezing Facilitates Formation of Silver Nanoparticles under Natural and Simulated Sunlight Conditions
Tan, Zhiqiang; Guo, Xiaoru1; Yin, Yongguang1; Wang, Bowen2; Bai, Qingsheng1; Li, Xia2; Liu, Jingfu1; Jiang, Guibin1
2019-12-03
Source PublicationENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN0013-936X
Volume53Issue:23Pages:13802-13811
AbstractFreezing 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.
Department环境化学与生态毒理学国家重点实验室
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/42546
Collection环境化学与生态毒理学国家重点实验室
Affiliation1.Chinese Acad Sci, State Key Lab Environm Chem & Ecotoxicol, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Liaoning Univ, Sch Environm Sci, Shenyang 110036, Liaoning, Peoples R China
Recommended Citation
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.
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