title: Degradation of aqueous 3,4-dichloroaniline by a novel dielectric barrier discharge plasma reactor.
abstract: Degradation of aqueous 3,4-dichloroaniline (3,4-DCA) was conducted in a novel dielectric barrier discharge (DBD) plasma reactor. The factors affecting the degradation efficiency of 3,4-DCA and the degradation mechanism of 3,4-DCA were investigated. The experimental results indicated that the degradation efficiency of 3,4-DCA increased with increasing input power intensity, and the degradation of 3,4-DCA by the novel DBD plasma reactor fitted pseudo-first-order kinetics. Higher degradation efficiency of 3,4-DCA was observed in acidic conditions. The degradation efficiency of 3,4-DCA, the removal rate of total organic carbon (TOC), and the detected Cl(-) increased dramatically with adding Fe(2+) or Fe(3+). Degradation of 3,4-DCA could be accelerated or inhibited in the presence of H2O2 depending on the dosage. Several degradation intermediates of 3,4-DCA such as 1,2-dichlorobenzene, 2-chloro-1,4-benzoquinone, 3,4-dichlorophenyl isocyanate, 2-chlorohydroquinone, 3,4-dichloronitrobenzene, and 3,4-dichlorophenol were identified by gas chromatography mass spectrometry (GC-MS) analysis. Based on the identification of aromatic intermediates, acetic acid, formic acid, oxalic acid, and Cl(-) released, a possible mineralization pathway of 3,4-DCA was proposed.
authors.affiliation: School of Civil Engineering, Hefei University of Technology, Hefei, 230009, China.
authors.forename: Jingwei
authors.initials: J
authors.lastname: Feng
authors.forename: Runlong
authors.initials: R
authors.lastname: Liu
authors.forename: Pei
authors.initials: P
authors.lastname: Chen
authors.forename: Shoujun
authors.initials: S
authors.lastname: Yuan
authors.forename: Dayong
authors.initials: D
authors.lastname: Zhao
authors.forename: Jibiao
authors.initials: J
authors.lastname: Zhang
authors.forename: Zheng
authors.initials: Z
authors.lastname: Zheng
mesh_terms: D019342:Acetic Acid / Q000032:analysis; D000814:Aniline Compounds / Q000737:chemistry*; D016227:Benzoquinones / Q000032:analysis; D002722:Chlorobenzenes / Q000032:analysis; D002733:Chlorophenols / Q000032:analysis; D055664:Electrochemical Techniques / Q000379:methods*; D005561:Formates / Q000032:analysis; D008401:Gas Chromatography-Mass Spectrometry; D006861:Hydrogen Peroxide / Q000737:chemistry; D008956:Models, Chemical; D010070:Oxalates / Q000032:analysis; D058626:Plasma Gases; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D000814:Aniline Compounds; D016227:Benzoquinones; D002722:Chlorobenzenes; D002733:Chlorophenols; D005561:Formates; D010070:Oxalates; D058626:Plasma Gases; D014874:Water Pollutants, Chemical; C043374:3,4-dichlorophenol; C030544:formic acid; C014464:3,4-dichloroaniline; C107221:2-chloro-1,4-benzoquinone; C004726:2-dichlorobenzene; D006861:Hydrogen Peroxide; D019342:Acetic Acid