Effect of pyrene on formation of natural silver nanoparticles via reduction of silver ions by humic acid under UV irradiation
Effect of pyrene on formation of natural silver nanoparticles via reduction of silver ions by humic acid under UV irradiation
复制标题
紫外辐照下芘对腐植酸还原银离子形成天然银纳米颗粒的影响
DOI：
10.1016/j.chemosphere.2020.125937
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发表时间：
2020
期刊：
影响因子：
8.8
通讯作者：
Jie Fu
中科院分区：
文献类型：
--
作者：
Min Liu;Xinyu Gao;Fei Pan;Yuwei Deng;Dongsheng Xia;Zhang Li;Jie Fu
本文报道了在水环境中，在紫外光照射下，通过腐植酸还原银离子形成天然银纳米粒子(AgNPs)的过程中，Py的作用。温度(25e90℃)、pH(5e9)或腐植酸浓度(2.5e15 mg/L)的增加会促进AgNPs的形成。透射电子显微镜照片表明，所制备的AgNPs为球形，平均粒径约为20 nm。Py对银离子的光还原能力有限，当Py和腐植酸同时存在时，Py与腐植酸竞争还原银离子。然而，芘的存在会提高天然银纳米粒子的稳定性，并抑制其抗菌活性。在45天内，由芘产生的AgNPs悬浮液的UVevis光谱没有变化。含芘的AgNPs对大肠杆菌的抑制率比不含芘的AgNPs的抑制率低8e32%。这项研究提供了与多环芳烃相互作用的天然AgNPs的去向和生态毒性的环境影响。
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 (25e90 C), pH (5e9) or concentration of humic acid (2.5e15 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 UVevis 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 8e32% 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.