Institute of Environmental Research at Greater Bay Area, Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou, Guangdong, 510405, PR China.
Ministry of Education Key Laboratory of Pollution Control and Ecological Remediation for Industrial Agglomeration Area, School of Environment and Energy, South China University of Technology, Guangzhou, 510006, Guangdong, PR China.
Chemosphere. 2022 Jan;286(Pt 3):131836. doi: 10.1016/j.chemosphere.2021.131836. Epub 2021 Aug 10.
The present study focuses on the successful preparation of microbial palladium nanoparticles (Pd-NPs). The even distribution of Pd in the periplasmic space of B. megaterium Y-4 cells is characterized using a transmission electronic microscopy (TEM) and scanning electron microscope (SEM). X-Ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) revealed the domination of Pd (0) in Pd-NPs. The microbial Pd-NPs were selected to detoxify triclosan (TCS). Liquid chromatography-mass spectrometry (LC-MS) was used to analyze the intermediate products of dechlorination and oxidization. Free radicals quenching and 5,5-dimethyl-1-pyrroline N-oxide (DMPO) capturing experiments confirmed the crucial contribution of atomic H• and O to TCS degradation. Besides, TCS degradation by microbial Pd-NPs could alleviate the cytotoxicity of TCS polluted water. Meanwhile, great circulating utilization of microbial Pd-NPs was obtained in degrading TCS. Corresponding findings in the present study could provide new insight into the role of microbial Pd-NPs in detoxifying pollutants.
本研究聚焦于成功制备微生物钯纳米粒子（Pd-NPs）。利用透射电子显微镜（TEM）和扫描电子显微镜（SEM）研究了 Pd 在巨大芽孢杆菌 Y-4 细胞周质空间中的均匀分布。X 射线光电子能谱（XPS）和 X 射线衍射（XRD）表明 Pd-NPs 中主要存在 Pd（0）。选择微生物 Pd-NPs 来降解三氯生（TCS）。利用液相色谱-质谱（LC-MS）分析脱氯和氧化的中间产物。自由基猝灭和 5,5-二甲基-1-吡咯啉 N-氧化物（DMPO）捕获实验证实原子 H•和 O•对 TCS 降解的重要贡献。此外，微生物 Pd-NPs 降解 TCS 可以减轻 TCS 污染水的细胞毒性。同时，在降解 TCS 的过程中，微生物 Pd-NPs 得到了很好的循环利用。本研究中的相关发现为微生物 Pd-NPs 在污染物解毒中的作用提供了新的见解。
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