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Degradation of 2, 4-dichlorophenol in aqueous solution by dielectric barrier discharge: Effects of plasma-working gases, degradation pathways and toxicity assessment.
Chemosphere. 2018 Aug; 204:351-358.C

Abstract

Chlorinated phenols are a class of contaminants found in water and have been regarded as a great potential risk to environment and human health. It is thus urgent to develop effective techniques to remove chlorinated phenols in wastewater. For this purpose, we employed dielectric barrier discharge (DBD) in this work and studied the efficiency of DBD for the degradation of 2,4-dichlorophenol (2,4-DCP), one of the most typical chlorophenols in the environment. The effects of pH value, applied voltage and plasma-working gases on the dichlorophenol-removal efficiency were investigated. The results demonstrate that DBD plasma could successfully degrade 2,4-DCP, achieving efficiency of 98.16% (k = 1.09 min-1) in the Ar-DBD system, and 77.60% (k = 0.48 min-1) in the N2-DBD system, with the process following the first-order kinetics. The removal efficiency was reduced in the presence of radical scavengers, confirming that hydroxyl radicals played a key role in the degradation process, while other active substances were also found such as nitrogen radicals in the N2-DBD system, which was found to have also contribution to the degradation of 2,4-DCP. The intermediates and final products generated in the degradation process were analyzed using gas chromatography-mass spectrometry (GC-MS). Based on the identification of intermediates, the degradation pathways and mechanism were proposed and discussed. Besides, the toxicity of the DBD treated 2,4-DCP solution was also assessed using GFP-expressing recombinant Escherichia coli (E. coli) as the testing organism, showing that plasma treatment could substantially reduce the toxic effect of 2,4-DCP.

Authors+Show Affiliations

Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Institute of Technical Biology and Agriculture Engineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China; Key Laboratory of Environmental Toxicology and Pollution Control Technology of Anhui Province, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China.Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Institute of Technical Biology and Agriculture Engineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China; Department of Modern Mechanics and School of Life Science, University of Science & Technology of China, Hefei, China.Department of Modern Mechanics and School of Life Science, University of Science & Technology of China, Hefei, China.Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Institute of Technical Biology and Agriculture Engineering, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China; Key Laboratory of Environmental Toxicology and Pollution Control Technology of Anhui Province, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China; Department of Modern Mechanics and School of Life Science, University of Science & Technology of China, Hefei, China. Electronic address: huangq@ipp.ac.cn.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29674147

Citation

Zhang, Hong, et al. "Degradation of 2, 4-dichlorophenol in Aqueous Solution By Dielectric Barrier Discharge: Effects of Plasma-working Gases, Degradation Pathways and Toxicity Assessment." Chemosphere, vol. 204, 2018, pp. 351-358.
Zhang H, Zhang Q, Miao C, et al. Degradation of 2, 4-dichlorophenol in aqueous solution by dielectric barrier discharge: Effects of plasma-working gases, degradation pathways and toxicity assessment. Chemosphere. 2018;204:351-358.
Zhang, H., Zhang, Q., Miao, C., & Huang, Q. (2018). Degradation of 2, 4-dichlorophenol in aqueous solution by dielectric barrier discharge: Effects of plasma-working gases, degradation pathways and toxicity assessment. Chemosphere, 204, 351-358. https://doi.org/10.1016/j.chemosphere.2018.04.052
Zhang H, et al. Degradation of 2, 4-dichlorophenol in Aqueous Solution By Dielectric Barrier Discharge: Effects of Plasma-working Gases, Degradation Pathways and Toxicity Assessment. Chemosphere. 2018;204:351-358. PubMed PMID: 29674147.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Degradation of 2, 4-dichlorophenol in aqueous solution by dielectric barrier discharge: Effects of plasma-working gases, degradation pathways and toxicity assessment. AU - Zhang,Hong, AU - Zhang,Qifu, AU - Miao,Chunguang, AU - Huang,Qing, Y1 - 2018/04/11/ PY - 2017/12/10/received PY - 2018/03/08/revised PY - 2018/04/10/accepted PY - 2018/4/21/pubmed PY - 2018/8/15/medline PY - 2018/4/21/entrez KW - 2,4-Dichlorophenol KW - Advanced oxidation processes (AOPs) KW - Dielectric barrier discharge (DBD) KW - Inert gas KW - Nitrogen and oxygen gases KW - Non-thermal plasma SP - 351 EP - 358 JF - Chemosphere JO - Chemosphere VL - 204 N2 - Chlorinated phenols are a class of contaminants found in water and have been regarded as a great potential risk to environment and human health. It is thus urgent to develop effective techniques to remove chlorinated phenols in wastewater. For this purpose, we employed dielectric barrier discharge (DBD) in this work and studied the efficiency of DBD for the degradation of 2,4-dichlorophenol (2,4-DCP), one of the most typical chlorophenols in the environment. The effects of pH value, applied voltage and plasma-working gases on the dichlorophenol-removal efficiency were investigated. The results demonstrate that DBD plasma could successfully degrade 2,4-DCP, achieving efficiency of 98.16% (k = 1.09 min-1) in the Ar-DBD system, and 77.60% (k = 0.48 min-1) in the N2-DBD system, with the process following the first-order kinetics. The removal efficiency was reduced in the presence of radical scavengers, confirming that hydroxyl radicals played a key role in the degradation process, while other active substances were also found such as nitrogen radicals in the N2-DBD system, which was found to have also contribution to the degradation of 2,4-DCP. The intermediates and final products generated in the degradation process were analyzed using gas chromatography-mass spectrometry (GC-MS). Based on the identification of intermediates, the degradation pathways and mechanism were proposed and discussed. Besides, the toxicity of the DBD treated 2,4-DCP solution was also assessed using GFP-expressing recombinant Escherichia coli (E. coli) as the testing organism, showing that plasma treatment could substantially reduce the toxic effect of 2,4-DCP. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/29674147/Degradation_of_2_4_dichlorophenol_in_aqueous_solution_by_dielectric_barrier_discharge:_Effects_of_plasma_working_gases_degradation_pathways_and_toxicity_assessment_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(18)30694-5 DB - PRIME DP - Unbound Medicine ER -