PMID- 31812060 OWN - NLM STAT- MEDLINE DCOM- 20200319 LR - 20200319 IS - 1879-1298 (Electronic) IS - 0045-6535 (Linking) VI - 244 DP - 2020 Apr TI - Insights into mechanisms of UV/ferrate oxidation for degradation of phenolic pollutants: Role of superoxide radicals. PG - 125490 LID - S0045-6535(19)32730-4 [pii] LID - 10.1016/j.chemosphere.2019.125490 [doi] AB - In this study, the performances and mechanisms of UV/ferrate(VI) oxidation were investigated comprehensively using 2,4-dichlorophenol (2,4-DCP) as a probe compound. UV/ferrate(VI) oxidation could efficiently degrade 2,4-DCP and its oxidation ability outperformed conventional UV-based advanced oxidation processes. Moreover, the degradation process of 2,4-DCP followed the pseudo-first order kinetics. In the absence of phosphate buffer, the rate constant of 2,4-DCP degradation increased from 9.4 x 10(-3) to 2.4 x 10(-2) min(-1) when pH value was increased from 3.0 to 6.0. However, the degradation was significantly inhibited by phosphate buffer at an identical pH due to the complexation of phosphate with the ferrate(VI) decay products. HCO(3)(-) appreciably accelerated the degradation of 2,4-DCP, while Cl(-) showed a negligible effect on the degradation. For the first time, combining with the results of chemical probe method, competitive kinetic experiment, electron spin resonance spectra and radical quenching studies, superoxide radicals were demonstrated as the dominant reactive species responsible for the degradation. On the basis of the intermediates detected by LC-MS/MS analysis, a pathway for 2,4-DCP degradation was proposed. This study provides a novel approach for contaminant removal using UV/ferrate(VI) oxidation and sheds new insights into the oxidation mechanisms. CI - Copyright (c) 2019 Elsevier Ltd. All rights reserved. FAU - Wu, Shaohua AU - Wu S AD - Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, Guangdong, 525000, China; College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, China. FAU - Liu, Haiyang AU - Liu H AD - Datang Environment Industry Group Co., Ltd, Beijing, 100097, China. FAU - Lin, Yan AU - Lin Y AD - Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, Guangdong, 525000, China; College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, China. FAU - Yang, Chunping AU - Yang C AD - Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, Guangdong, 525000, China; College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, China; Hunan Provincial Environmental Protection Engineering Center for Organic Pollution Control of Urban Water and Wastewater, Changsha, Hunan, 410001, China. Electronic address: yangc@hnu.edu.cn. FAU - Lou, Wei AU - Lou W AD - Hunan Provincial Environmental Protection Engineering Center for Organic Pollution Control of Urban Water and Wastewater, Changsha, Hunan, 410001, China. FAU - Sun, Jianteng AU - Sun J AD - Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, Guangdong, 525000, China. Electronic address: sunjianteng@zju.edu.cn. FAU - Du, Cheng AU - Du C AD - Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, Guangdong, 525000, China. FAU - Zhang, Dongmei AU - Zhang D AD - Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, Guangdong, 525000, China. FAU - Nie, Lijun AU - Nie L AD - Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, Guangdong, 525000, China. FAU - Yin, Kai AU - Yin K AD - College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, China. FAU - Zhong, Yuanyuan AU - Zhong Y AD - Guangdong Provincial Key Laboratory of Petrochemical Pollution Processes and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, Guangdong, 525000, China. LA - eng PT - Journal Article DEP - 20191127 PL - England TA - Chemosphere JT - Chemosphere JID - 0320657 RN - 0 (Environmental Pollutants) RN - 0 (Phenols) RN - 0 (Phosphates) RN - 11062-77-4 (Superoxides) RN - 16836-06-9 (ferrate ion) RN - E1UOL152H7 (Iron) SB - IM MH - Chromatography, Liquid MH - Environmental Pollutants/analysis/*chemistry MH - Iron MH - Kinetics MH - Models, Chemical MH - Oxidation-Reduction MH - Phenols/analysis/*chemistry MH - Phosphates MH - Superoxides/*chemistry MH - Tandem Mass Spectrometry OTO - NOTNLM OT - Ferrate OT - Kinetics OT - Oxidation OT - Superoxide radicals OT - Ultraviolet light COIS- Declaration of competing interest The authors declare no competing financial interest. EDAT- 2019/12/08 06:00 MHDA- 2020/03/20 06:00 CRDT- 2019/12/08 06:00 PHST- 2019/08/02 00:00 [received] PHST- 2019/11/26 00:00 [revised] PHST- 2019/11/26 00:00 [accepted] PHST- 2019/12/08 06:00 [pubmed] PHST- 2020/03/20 06:00 [medline] PHST- 2019/12/08 06:00 [entrez] AID - S0045-6535(19)32730-4 [pii] AID - 10.1016/j.chemosphere.2019.125490 [doi] PST - ppublish SO - Chemosphere. 2020 Apr;244:125490. doi: 10.1016/j.chemosphere.2019.125490. Epub 2019 Nov 27.