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Heat-activated persulfate oxidation of methyl- and ethyl-parabens: Effect, kinetics, and mechanism.
Chemosphere. 2017 Feb; 168:1628-1636.C

Abstract

We evaluated the degradation of methylparaben (MeP) and ethylparaben (EtP), two representative parabens, using the heat-activated persulfate system in a laboratory. Both sulfate and hydroxyl radicals contributed to the removal of the two parabens. The degradations of both MeP and EtP were improved by increasing the heating temperature or persulfate dose in accordance with a pseudo-first-order reaction model. The oxidation efficiency of parabens was found to be pH-dependent; decreasing in the order pH 5.0 > 7.0 > 9.0. The presence of chloride, bicarbonate, or humic acid was found to inhibit the degradation of the two parabens to some extent because of competition for the reactive radicals, with humic acid having the most serious effect. Dealkylation of the methyl unit, decarboxylation of the carboxylic group, and subsequent hydrolysis are proposed to be involved in the degradation pathway of MeP. The results suggest that the heat-activated persulfate system might be efficiently applied in the treatment of paraben-containing water samples. This was also supported by the results of applying this system to treat a real water sample containing both MeP and EtP.

Authors+Show Affiliations

School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), Wuhan 430074, China; Key Laboratory of Water & Wastewater Treatment (HUST), MOHURD, Wuhan 430074, China.School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), Wuhan 430074, China; Key Laboratory of Water & Wastewater Treatment (HUST), MOHURD, Wuhan 430074, China.School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), Wuhan 430074, China; Key Laboratory of Water & Wastewater Treatment (HUST), MOHURD, Wuhan 430074, China. Electronic address: pengchao.x@gmail.com.School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), Wuhan 430074, China; Key Laboratory of Water & Wastewater Treatment (HUST), MOHURD, Wuhan 430074, China.School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), Wuhan 430074, China; Key Laboratory of Water & Wastewater Treatment (HUST), MOHURD, Wuhan 430074, China. Electronic address: zongpingw@hust.edu.cn.School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), Wuhan 430074, China; Key Laboratory of Water & Wastewater Treatment (HUST), MOHURD, Wuhan 430074, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27939663

Citation

Chen, Yiqun, et al. "Heat-activated Persulfate Oxidation of Methyl- and Ethyl-parabens: Effect, Kinetics, and Mechanism." Chemosphere, vol. 168, 2017, pp. 1628-1636.
Chen Y, Deng P, Xie P, et al. Heat-activated persulfate oxidation of methyl- and ethyl-parabens: Effect, kinetics, and mechanism. Chemosphere. 2017;168:1628-1636.
Chen, Y., Deng, P., Xie, P., Shang, R., Wang, Z., & Wang, S. (2017). Heat-activated persulfate oxidation of methyl- and ethyl-parabens: Effect, kinetics, and mechanism. Chemosphere, 168, 1628-1636. https://doi.org/10.1016/j.chemosphere.2016.11.143
Chen Y, et al. Heat-activated Persulfate Oxidation of Methyl- and Ethyl-parabens: Effect, Kinetics, and Mechanism. Chemosphere. 2017;168:1628-1636. PubMed PMID: 27939663.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Heat-activated persulfate oxidation of methyl- and ethyl-parabens: Effect, kinetics, and mechanism. AU - Chen,Yiqun, AU - Deng,Pinya, AU - Xie,Pengchao, AU - Shang,Ran, AU - Wang,Zongping, AU - Wang,Songlin, Y1 - 2016/12/02/ PY - 2016/06/28/received PY - 2016/11/23/revised PY - 2016/11/28/accepted PY - 2016/12/13/pubmed PY - 2017/1/31/medline PY - 2016/12/13/entrez KW - Ethylparaben KW - Heat KW - Hydroxyl radical KW - Methylparaben KW - Persulfate KW - Sulfate radical SP - 1628 EP - 1636 JF - Chemosphere JO - Chemosphere VL - 168 N2 - We evaluated the degradation of methylparaben (MeP) and ethylparaben (EtP), two representative parabens, using the heat-activated persulfate system in a laboratory. Both sulfate and hydroxyl radicals contributed to the removal of the two parabens. The degradations of both MeP and EtP were improved by increasing the heating temperature or persulfate dose in accordance with a pseudo-first-order reaction model. The oxidation efficiency of parabens was found to be pH-dependent; decreasing in the order pH 5.0 > 7.0 > 9.0. The presence of chloride, bicarbonate, or humic acid was found to inhibit the degradation of the two parabens to some extent because of competition for the reactive radicals, with humic acid having the most serious effect. Dealkylation of the methyl unit, decarboxylation of the carboxylic group, and subsequent hydrolysis are proposed to be involved in the degradation pathway of MeP. The results suggest that the heat-activated persulfate system might be efficiently applied in the treatment of paraben-containing water samples. This was also supported by the results of applying this system to treat a real water sample containing both MeP and EtP. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/27939663/Heat_activated_persulfate_oxidation_of_methyl__and_ethyl_parabens:_Effect_kinetics_and_mechanism_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(16)31689-7 DB - PRIME DP - Unbound Medicine ER -