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Open AccessArticle

Impact of Active Chlorines and •OH Radicals on Degradation of Quinoline Using the Bipolar Electro-Fenton Process

1
College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
2
College of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang 453003, China
*
Author to whom correspondence should be addressed.
Water 2021, 13(2), 128; https://doi.org/10.3390/w13020128
Received: 26 November 2020 / Revised: 5 January 2021 / Accepted: 5 January 2021 / Published: 7 January 2021
(This article belongs to the Section Wastewater Treatment and Reuse)
Quinoline is a typical nitrogenous heterocyclic compound, which is carcinogenic, teratogenic, and mutagenic to organisms, and its wastewater is difficult to biodegrade directly. The bipolar electro-Fenton process was employed to treat quinoline solution. The process/reaction conditions were optimized through the single factor experiment. The degradation kinetics of chemical oxygen demand (COD) was analyzed. To get the degradation mechanism and pathways of quinoline, the intermediate products were identified by gas chromatograph–mass spectrometer (GC–MS). By using sodium chloride as supporting electrolyte in the electro-Fenton reaction system with initial pH 3.0, conductivity 15,800 µs/cm, H2O2 concentration 71 mmol/L, current density 30.5 mA/cm2, and applied voltage 26.5 V, 75.56% of COD was decreased by indirect oxidation with electrogeneration of hydroxyl radicals (•OH) and active chloric species in 20 min. The COD decrease of quinoline solution followed the first order reaction kinetic model. The main products of quinoline degradation were 2(1H)-quinolinone, 4-chloro-2(1H)-quinolinone, 5-chloro-8-hydroxyquinoline, and 5,7-dichloro-8-hydroxyquinoline. Furthermore, two possible degradation pathways of quinoline were proposed, supported with Natural charge distribution on quinoline and intermediates calculated at the theoretical level of MN15L/6-311G(d). View Full-Text
Keywords: quinoline; bipolar eletro-Fenton; active chlorines; hydroxyl radicals; kinetic model; degradation pathways; mechanism quinoline; bipolar eletro-Fenton; active chlorines; hydroxyl radicals; kinetic model; degradation pathways; mechanism
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MDPI and ACS Style

Zhang, W.; Chen, J.; Wang, J.; Cui, C.-X.; Wang, B.; Zhang, Y. Impact of Active Chlorines and •OH Radicals on Degradation of Quinoline Using the Bipolar Electro-Fenton Process. Water 2021, 13, 128. https://doi.org/10.3390/w13020128

AMA Style

Zhang W, Chen J, Wang J, Cui C-X, Wang B, Zhang Y. Impact of Active Chlorines and •OH Radicals on Degradation of Quinoline Using the Bipolar Electro-Fenton Process. Water. 2021; 13(2):128. https://doi.org/10.3390/w13020128

Chicago/Turabian Style

Zhang, Wenlong; Chen, Jun; Wang, Jichao; Cui, Cheng-Xing; Wang, Bingxing; Zhang, Yuping. 2021. "Impact of Active Chlorines and •OH Radicals on Degradation of Quinoline Using the Bipolar Electro-Fenton Process" Water 13, no. 2: 128. https://doi.org/10.3390/w13020128

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