Environmentally Relevant Freeze-Thaw Cycles Enhance the RedoxMediated Morphological Changes of Silver Nanoparticles
文献类型：期刊论文
| 作者 | Guo, Xiaoru; Yi, Yongguang; Tan, Zhiqiang ; Liu, Jingfu
|
| 刊名 | ENVIRONMENTAL SCIENCE & TECHNOLOGY
 |
| 出版日期 | 2018-06-19 |
| 卷号 | 52期号:12页码:6928-6935 |
| ISSN号 | 0013-936X |
| 文献子类 | Article |
| 英文摘要 | Silver nanoparticles (AgNPs) are inevitably released into natural systems, particularly into aquatic environments, where they are oxidized and release Ag+, which is reduced back to AgNPs. Environmental freeze-thaw cycles or freezing may accelerate the dynamic transformation between AgNPs and Ag+. Herein, the significant morphological changes caused by freezing treatments were assessed by UV-vis spectroscopy and high-resolution transmission electron microscopy, which revealed that reductive regeneration, particle fusion, and coalescence of the AgNPs occurred. In addition, a stable Ag isotope was used to track the AgNP redox reaction, which was round to be accelerated under freezing and freeze-thaw cycles relative to the reaction of particles stored at a normal temperature (4 degrees C, 25 degrees C). Furthermore, natural organic matter was found to stabilize the particle morphology. Ca2+ and Cl- intensified the morphological changes and redox reaction through Ca2+-induced particle coalescence and Cl--enhanced reduction of Ag+ during the freeze-thaw treatment. These physicochemical changes also occurred for an environmentally relevant concentration of AgNPs (50 ng L-1) in simulated environmental conditions and natural water samples after freeze-thaw cycles. Since the morphological changes and redox acceleration induced by environmental freezing conditions could dramatically influence the mobility, bioavailability, toxicity, and environmental fate of AgNPs, the freeze-thaw-induced effects should be considered'in the environmental risk assessment of AgNPs. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/40938]  |
| 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 | Guo, Xiaoru,Yi, Yongguang,Tan, Zhiqiang,et al. Environmentally Relevant Freeze-Thaw Cycles Enhance the RedoxMediated Morphological Changes of Silver Nanoparticles[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2018,52(12):6928-6935. |
| APA | Guo, Xiaoru,Yi, Yongguang,Tan, Zhiqiang,&Liu, Jingfu.(2018).Environmentally Relevant Freeze-Thaw Cycles Enhance the RedoxMediated Morphological Changes of Silver Nanoparticles.ENVIRONMENTAL SCIENCE & TECHNOLOGY,52(12),6928-6935. |
| MLA | Guo, Xiaoru,et al."Environmentally Relevant Freeze-Thaw Cycles Enhance the RedoxMediated Morphological Changes of Silver Nanoparticles".ENVIRONMENTAL SCIENCE & TECHNOLOGY 52.12(2018):6928-6935. |
入库方式： OAI收割
来源：生态环境研究中心
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