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[Degradation of Triclosan by Heat Activated Persulfate Oxidation].
Huan Jing Ke Xue. 2018 Apr 08; 39(4):1661-1667.HJ

Abstract

Sulfate radical (SO4·-)-based advanced oxidation technologies (SR-AOPs) are widely used for remediation of contaminated groundwater and soils. This study investigated the reaction kinetics, products, and transformation pathways of triclosan, a widely used antimicrobial agent, during its degradation by heat activated persulfate oxidation. Experimental results revealed that increasing temperature or initial persulfate concentration significantly enhanced the degradation of triclosan. The reaction could be fitted in the pseudo-first-order kinetic model and the activation energy (Ea) was determined to be 142 kJ·mol-1. The presence of humic acid markedly inhibited triclosan degradation, whereas chloride (Cl-) showed a more complicated effect. Triclosan degradation was slightly accelerated in the presence of 5 μmol·L-1 Cl-, however, a higher concentration of Cl- (e.g., 10 μmol·L-1) showed an inhibitory effect. Using liquid chromatography-mass spectrometry, a total of six transformation products, including 4-chlorocatechol, 2,4-dichlorophenol, and 2-chloro-5-(2,4-dichloro-6-hydroxyphenoxy)-1,4-benzoquinone, were identified. Accordingly, the cleavage of the ether bond and hydroxylation of the phenol ring were proposed as the principal pathways of triclosan degradation upon reaction with SO4·-. The findings of this study can be used to evaluate the feasibility of decontamination of triclosan by SR-AOPs.

Authors+Show Affiliations

College of Resources & Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.College of Resources & Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.College of Resources & Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.College of Resources & Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.

Pub Type(s)

Journal Article

Language

chi

PubMed ID

29964991

Citation

Jiang, Meng-di, et al. "[Degradation of Triclosan By Heat Activated Persulfate Oxidation]." Huan Jing Ke Xue= Huanjing Kexue, vol. 39, no. 4, 2018, pp. 1661-1667.
Jiang MD, Zhang QY, Ji YF, et al. [Degradation of Triclosan by Heat Activated Persulfate Oxidation]. Huan Jing Ke Xue. 2018;39(4):1661-1667.
Jiang, M. D., Zhang, Q. Y., Ji, Y. F., & Lu, J. H. (2018). [Degradation of Triclosan by Heat Activated Persulfate Oxidation]. Huan Jing Ke Xue= Huanjing Kexue, 39(4), 1661-1667. https://doi.org/10.13227/j.hjkx.201707201
Jiang MD, et al. [Degradation of Triclosan By Heat Activated Persulfate Oxidation]. Huan Jing Ke Xue. 2018 Apr 8;39(4):1661-1667. PubMed PMID: 29964991.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - [Degradation of Triclosan by Heat Activated Persulfate Oxidation]. AU - Jiang,Meng-di, AU - Zhang,Qing-Yue, AU - Ji,Yue-Fei, AU - Lu,Jun-He, PY - 2018/7/3/entrez PY - 2018/7/3/pubmed PY - 2019/1/24/medline KW - heat activation KW - kinetics KW - sulfate radical KW - transformation products KW - triclosan SP - 1661 EP - 1667 JF - Huan jing ke xue= Huanjing kexue JO - Huan Jing Ke Xue VL - 39 IS - 4 N2 - Sulfate radical (SO4·-)-based advanced oxidation technologies (SR-AOPs) are widely used for remediation of contaminated groundwater and soils. This study investigated the reaction kinetics, products, and transformation pathways of triclosan, a widely used antimicrobial agent, during its degradation by heat activated persulfate oxidation. Experimental results revealed that increasing temperature or initial persulfate concentration significantly enhanced the degradation of triclosan. The reaction could be fitted in the pseudo-first-order kinetic model and the activation energy (Ea) was determined to be 142 kJ·mol-1. The presence of humic acid markedly inhibited triclosan degradation, whereas chloride (Cl-) showed a more complicated effect. Triclosan degradation was slightly accelerated in the presence of 5 μmol·L-1 Cl-, however, a higher concentration of Cl- (e.g., 10 μmol·L-1) showed an inhibitory effect. Using liquid chromatography-mass spectrometry, a total of six transformation products, including 4-chlorocatechol, 2,4-dichlorophenol, and 2-chloro-5-(2,4-dichloro-6-hydroxyphenoxy)-1,4-benzoquinone, were identified. Accordingly, the cleavage of the ether bond and hydroxylation of the phenol ring were proposed as the principal pathways of triclosan degradation upon reaction with SO4·-. The findings of this study can be used to evaluate the feasibility of decontamination of triclosan by SR-AOPs. SN - 0250-3301 UR - https://www.unboundmedicine.com/medline/citation/29964991/[Degradation_of_Triclosan_by_Heat_Activated_Persulfate_Oxidation]_ DB - PRIME DP - Unbound Medicine ER -