赤铁矿
细胞外
胞外聚合物
纳米颗粒
面(心理学)
化学工程
化学
抗生素耐药性
抗性(生态学)
降级(电信)
光催化
水生环境
微生物学
材料科学
抗生素
纳米技术
生态学
细菌
矿物学
生物化学
生物
生物膜
催化作用
心理学
社会心理学
计算机科学
人格
遗传学
工程类
电信
五大性格特征
作者
Li Wang,Jing-Chen Zhou,Zhenghao Li,Xin Zhang,Kenneth M.Y. Leung,Yuan Li,Guo‐Ping Sheng
标识
DOI:10.1021/acs.est.3c06571
摘要
The persistence of extracellular antibiotic resistance genes (ARGs) in aquatic environments has attracted increasing attention due to their potential threat to public health and the environment. However, the fate of extracellular ARGs in receiving water remains largely unknown. This study investigated the influence of hematite nanoparticles, a widespread natural mineral, on the photodegradation of extracellular ARGs in river water. Results showed that under exposure to visible light, hematite nanoparticles, at environmental concentrations, resulted in a 3–5 orders of magnitude reduction in extracellular ARGs. This photodegradation of extracellular ARGs is shown to be facet-dependent; the (001) facet of hematite demonstrates a higher removal rate than that of the (100) facet, which is ascribed to its enhanced adsorption capability and higher hydroxyl radical (•OH) production. Density functional theory (DFT) calculations corroborate this finding, indicating elevated iron density, larger adsorption energy, and lower energy barrier of •OH formation on the (001) facet, providing more active sites and •OH generation for extracellular ARG interaction. Gel electrophoresis and atomic force microscopy analyses further confirm that the (001) facet causes more substantial damage to extracellular ARGs than the (100) facet. These findings pave the way for predicting the photodegradation efficiency of hematite nanoparticles with varied facets, thereby shedding light on the inherent self-purification capacity for extracellular ARGs in both natural and engineered aquatic environments.
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