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Effect of pyrene on formation of natural silver nanoparticles via reduction of silver ions by humic acid under UV irradiation.
Chemosphere ( IF 8.1 ) Pub Date : 2020-01-16 , DOI: 10.1016/j.chemosphere.2020.125937 Min Liu 1 , Xinyu Gao 1 , Fei Pan 1 , Yuwei Deng 1 , Dongsheng Xia 1 , Zhang Li 2 , Jie Fu 2
Chemosphere ( IF 8.1 ) Pub Date : 2020-01-16 , DOI: 10.1016/j.chemosphere.2020.125937 Min Liu 1 , Xinyu Gao 1 , Fei Pan 1 , Yuwei Deng 1 , Dongsheng Xia 1 , Zhang Li 2 , Jie Fu 2
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This work reported the role of pyrene in formation of naturally occurring silver nanoparticles (AgNPs) via the reduction of silver ions by humic acid under the UV irradiation in the aquatic environment. An increase in temperature (25-90 °C), pH (5-9) or concentration of humic acid (2.5-15 mg/L) led to an enhanced formation of AgNPs. The TEM images indicated the formed AgNPs were spherical with an average particle size of ∼20 nm. Pyrene showed a limited capacity for the photoreduction of silver ions, and when both pyrene and humic acid were present, pyrene would compete with humic acid for the reduction of silver ions. However, the presence of pyrene would enhance the stability and suppress the antibacterial activity of natural AgNPs. The UV-vis spectra of AgNPs suspensions generated with pyrene did not change within 45 days. The inhibition rates against Escherichia coli of AgNPs generated with pyrene were 8-32% lower than those of AgNPs generated without pyrene. This study provides environmental implications on the fate and ecotoxicity of natural AgNPs with interaction of polycyclic aromatic hydrocarbons.
中文翻译：
UV通过在紫外线照射下通过腐殖酸还原银离子而对天然银纳米颗粒形成的影响。
这项工作报道了of在水生环境中通过腐植酸在紫外线照射下还原银离子，从而在自然形成的银纳米颗粒（AgNPs）形成中的作用。温度（25-90°C），pH（5-9）或腐殖酸浓度（2.5-15 mg / L）升高导致AgNPs形成增加。TEM图像表明所形成的AgNP为球形，平均粒径约为20 nm。showed对银离子的光还原能力有限，当同时存在pyr和腐殖酸时，pyr将与腐殖酸竞争还原银离子。但是，of的存在会增强稳定性并抑制天然AgNPs的抗菌活性。用pyr生成的AgNPs悬浮液的紫外可见光谱在45天内没有变化。pyr生成的AgNPs对大肠杆菌的抑制率比未without生成的AgNPs低8-32％。这项研究对天然AgNP的命运和生态毒性以及多环芳烃的相互作用具有环境影响。
更新日期：2020-01-17
中文翻译：
UV通过在紫外线照射下通过腐殖酸还原银离子而对天然银纳米颗粒形成的影响。
这项工作报道了of在水生环境中通过腐植酸在紫外线照射下还原银离子，从而在自然形成的银纳米颗粒（AgNPs）形成中的作用。温度（25-90°C），pH（5-9）或腐殖酸浓度（2.5-15 mg / L）升高导致AgNPs形成增加。TEM图像表明所形成的AgNP为球形，平均粒径约为20 nm。showed对银离子的光还原能力有限，当同时存在pyr和腐殖酸时，pyr将与腐殖酸竞争还原银离子。但是，of的存在会增强稳定性并抑制天然AgNPs的抗菌活性。用pyr生成的AgNPs悬浮液的紫外可见光谱在45天内没有变化。pyr生成的AgNPs对大肠杆菌的抑制率比未without生成的AgNPs低8-32％。这项研究对天然AgNP的命运和生态毒性以及多环芳烃的相互作用具有环境影响。
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