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  • Degradation of aqueous 3,4-dichloroaniline by a novel dielectric barrier discharge plasma reactor.

Degradation of aqueous 3,4-dichloroaniline by a novel dielectric barrier discharge plasma reactor.

Environmental science and pollution research international (2014-10-16)
Jingwei Feng, Runlong Liu, Pei Chen, Shoujun Yuan, Dayong Zhao, Jibiao Zhang, Zheng Zheng
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.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
2-Chloro-1,4-benzoquinone, 95%
Sigma-Aldrich
3,4-Dichloroaniline, 98%