title: Dielectric barrier discharge plasma induced degradation of aqueous atrazine.
abstract: Degradation of herbicide atrazine in aqueous solution was investigated using a plate type dielectric barrier discharge (DBD) plasma reactor. DBD plasma was generated at the gas-liquid interface of the formed water film. At discharge time of 14 min, atrazine was degradated effectively with a degradation rate of 99 % at the discharge power of 200 W. The experimental data fitted well with first-order kinetics and the energy efficiency for 90 % degradation of atrazine (G value) was calculated, obtaining a rate constant of 0.35 min(-1) and a G value of 1.27 × 10(-10) mol J(-1) (98.76 mg kW(-1) h(-1)) at a discharge power of 200 W, respectively. The addition of Fe(2+) increased the rate constant and G value dramatically, and a significant decrease of the rate constant and G value was observed with the addition of radical scavengers (tert-butyl alcohol, isopropyl alcohol, or Na2CO3). The generated aqueous O3 and H2O2 were determined, which promoted the degradation of herbicide atrazine. Dechlorination was observed and the experimentally detected Cl(-) was 1.52 mg L(-1) at a discharge time of 14 min. The degradation intermediates of atrazine were detected by means of liquid chromatography-mass spectrometry; dechlorination, hydroxylation, dealkylation, and alkyl oxidation processes were involved in the degradation pathways of atrazine.
authors.affiliation: School of Civil Engineering, Hefei University of Technology, Hefei, 230009, China.|State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210046, China.
authors.forename: Jingwei
authors.initials: J
authors.lastname: Feng
authors.affiliation: School of Civil Engineering, Hefei University of Technology, Hefei, 230009, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Jiang
authors.affiliation: School of Civil Engineering, Hefei University of Technology, Hefei, 230009, China.
authors.forename: Dan
authors.initials: D
authors.lastname: Zhu
authors.affiliation: School of Civil Engineering, Hefei University of Technology, Hefei, 230009, China.
authors.forename: Kuizu
authors.initials: K
authors.lastname: Su
authors.affiliation: State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, College of Hydrology and Water Resources, Hohai University, Nanjing, 210098, China.
authors.forename: Dayong
authors.initials: D
authors.lastname: Zhao
authors.affiliation: Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, China. jbzhang@fudan.edu.cn.
authors.forename: Jibiao
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, China. zzhenghj@fudan.edu.cn.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Zheng
mesh_terms: D001280:Atrazine / Q000032:analysis / Q000737:chemistry*; D002853:Chromatography, Liquid; D006540:Herbicides / Q000032:analysis / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry; D013058:Mass Spectrometry; D010084:Oxidation-Reduction; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D006540:Herbicides; D014874:Water Pollutants, Chemical; D014867:Water; D006861:Hydrogen Peroxide; D001280:Atrazine
keywords: Advanced oxidation processes; Atrazine; Degradation mechanism; Dielectric barrier discharge plasma
references.citation: Water Res. 2002 Dec;36(20):5113-9
references.pmid: 12448559
references.citation: J Hazard Mater. 2006 Nov 2;138(1):187-94
references.pmid: 16822612
references.citation: J Hazard Mater. 2014 Jun 30;275:166-74
references.pmid: 24862347
references.citation: Environ Pollut. 2014 Jun;189:134-42
references.pmid: 24661999
references.citation: Environ Sci Pollut Res Int. 2014;21(16):9948-58
references.pmid: 24840355
references.citation: Chem Rev. 2009 Dec;109(12):6570-631
references.pmid: 19839579
references.citation: J Hazard Mater. 2008 Jun 15;154(1-3):1081-9
references.pmid: 18082943
references.citation: J Hazard Mater. 2003 Mar 17;98(1-3):33-50
references.pmid: 12628776
references.citation: Water Res. 2010 Jun;44(11):3445-53
references.pmid: 20398913
references.citation: Water Res. 2005 Nov;39(19):4705-14
references.pmid: 16256168
references.citation: Environ Sci Technol. 2012 Nov 20;46(22):12608-15
references.pmid: 23082747
references.citation: Environ Sci Pollut Res Int. 2015 Dec;22(23):18345-62
references.pmid: 26493299
references.citation: Water Res. 2002 Mar;36(5):1143-54
references.pmid: 11902771
references.citation: Water Res. 2002 Dec;36(20):5120-6
references.pmid: 12448560
references.citation: Water Res. 2009 Apr;43(7):1924-34
references.pmid: 19249809
references.citation: Environ Sci Pollut Res Int. 2015 Mar;22(6):4447-59
references.pmid: 25315933
references.citation: Chemosphere. 2006 Aug;64(6):931-6
references.pmid: 16488463
references.citation: Environ Sci Pollut Res Int. 2015 Oct;22(20):15772-80
references.pmid: 26036582
references.citation: Chemosphere. 2004 Jan;54(1):71-8
references.pmid: 14559259
references.citation: J Hazard Mater. 2009 May 30;164(2-3):609-14
references.pmid: 18838216
references.citation: Chemosphere. 2011 Feb;82(8):1155-60
references.pmid: 21215422