Inter-transformation between silver nanoparticles and Ag(+)induced by humic acid under light or dark conditions
文献类型： 外文期刊
作者： Liu, Yujia 1 ; Li, Chao 1 ; Luo, Si 2 ; Wang, Xi 2 ; Zhang, Qingmei 3 ; Wu, Haiyong 1 ;
作者机构： 1.Hunan Acad Agr Sci, Soil & Fertilizer Inst Hunan Prov, Changsha 401125, Peoples R China
2.Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China
3.Hunan Res Acad Environm Sci, Hunan Prov Environm Protect Air Compound Pollut P, Changsha 410004, Peoples R China
关键词： AgNPs; Reduction; Oxidation; Natural organic matter; Sunlight
期刊名称：ECOTOXICOLOGY （ 影响因子：2.823； 五年影响因子：2.958 ）
ISSN： 0963-9292
年卷期：
页码：
收录情况： SCI
摘要： The fate and toxicity of silver nanoparticles (AgNPs) and ions in water bodies is largely determined by the natural organic matter (NOM)-mediated redox cycling. However, the process of NOM-mediated redox cycling in the day/night cycles remains elusive. In this study, the inter-transformation between AgNPs and Ag(+)ion caused by humic acid (HA) was investigated under controlled light and dark conditions. It was shown that HA induced the reduction of Ag(+)into AgNPs in simulated sunlight, and also oxidize AgNPs to release Ag(+)in darkness. Kinetics data demonstrated that the rates of AgNPs formation and dissolution increased along with the increment of HA concentrations. Along with the pH increase, the reduction of Ag(+)accelerated, but the oxidative dissolution of AgNPs was inhibited. In day-night cycles, the AgNPs and Ag(+)concentrations exhibited similar wave-shaped change curves. The peaks of AgNPs and Ag(+)ion appeared at 7 p.m. and 7 a.m., respectively. The toxicity of AgNPs/Ag(+)toEscherichia coliwas determined primarily by the concentration of dissolved Ag+, but also affected by the particle-specific toxicity. The dual role of HA implied that previous reports about the photo-reduction of Ag(+)to AgNPs by NOM should be reconsidered, and the oxidizability of HA in darkness strongly affect the transformation and toxicity of AgNPs in water.
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Inter-transformation between silver nanoparticles and Ag+ induced by humic acid under light or dark conditions (Oct, 10.1007/s10646-020-02284-3, 2020)
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