Feng Jingwei, Liu Runlong, Chen Pei, Yuan Shoujun, Zhao Dayong, Zhang Jibiao, Zheng Zheng
School of Civil Engineering, Hefei University of Technology, Hefei, 230009, China.
Environ Sci Pollut Res Int. 2015 Mar;22(6):4447-59. doi: 10.1007/s11356-014-3690-1. Epub 2014 Oct 15.
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.
在新型介质阻挡放电（DBD）等离子体反应器中对水溶液中的3,4-二氯苯胺（3,4-DCA）进行了降解。研究了影响3,4-DCA降解效率的因素以及3,4-DCA的降解机理。实验结果表明，3,4-DCA的降解效率随输入功率强度的增加而提高，新型DBD等离子体反应器对3,4-DCA的降解符合准一级动力学。在酸性条件下观察到3,4-DCA具有更高的降解效率。添加Fe(2+)或Fe(3+)后，3,4-DCA的降解效率、总有机碳（TOC）的去除率以及检测到的Cl(-)均显著增加。在H2O2存在下，3,4-DCA的降解可能会根据其用量而加速或受到抑制。通过气相色谱-质谱（GC-MS）分析鉴定了3,4-DCA的几种降解中间体，如1,2-二氯苯、2-氯-1,4-苯醌、3,4-二氯苯基异氰酸酯、2-氯对苯二酚、3,4-二氯硝基苯和3,4-二氯苯酚。基于对芳香族中间体、释放出的乙酸、甲酸、草酸和Cl(-)的鉴定，提出了3,4-DCA可能的矿化途径。
