Triclosan detoxification through dechlorination and oxidation via microbial Pd-NPs under aerobic conditions

Yuan Chen; Yuancai Chen; Jianbo Jia; Bing Yan

doi:10.1016/j.chemosphere.2021.131836

Triclosan detoxification through dechlorination and oxidation via microbial Pd-NPs under aerobic conditions

Chemosphere. 2022 Jan;286(Pt 3):131836. doi: 10.1016/j.chemosphere.2021.131836. Epub 2021 Aug 10.

Authors

Yuan Chen¹, Yuancai Chen², Jianbo Jia¹, Bing Yan³

Affiliations

¹ 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.
² 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. Electronic address: chenyc@scut.edu.cn.
³ 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. Electronic address: drbingyan@yahoo.com.

PMID: 34388436
DOI: 10.1016/j.chemosphere.2021.131836

Abstract

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 O₂^·- 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.

Keywords: Aerobic; Catalysis; Detoxification; Formic acid.

MeSH terms

Catalysis
Metal Nanoparticles*
Microscopy, Electron, Transmission
Palladium
Triclosan* / toxicity
X-Ray Diffraction

Substances

Triclosan
Palladium