摘要
In this work, a plasma-solution system was applied to the degradation of Acid Orange 7 （AO？）. The effects of initial concentration and type of feed gases （air, oxygen, nitrogen or argon） were studied. As the initial concentration increased from 100 mg/L to 160 mg/L, the discolouration rate of AO7 decreased from 99.3% to 95.9%, whereas the COD removal rate decreased from 37.9% to 22.6%. Air provided the best discolouration and COD removal rates （99.3% and 3？.9%, respectively）. In the presence of a zero-valent iron （ZVI） catalyst, the AO？ COD removal rate increased to 76.4%. The degradation products were analysed by a GC-MS, revealing that the degradation of the dye molecule was initiated through the cleavage of the -N=N- bond before finally being converted to organic acids.
In this work, a plasma-solution system was applied to the degradation of Acid Orange 7 （AO？）. The effects of initial concentration and type of feed gases （air, oxygen, nitrogen or argon） were studied. As the initial concentration increased from 100 mg/L to 160 mg/L, the discolouration rate of AO7 decreased from 99.3% to 95.9%, whereas the COD removal rate decreased from 37.9% to 22.6%. Air provided the best discolouration and COD removal rates （99.3% and 3？.9%, respectively）. In the presence of a zero-valent iron （ZVI） catalyst, the AO？ COD removal rate increased to 76.4%. The degradation products were analysed by a GC-MS, revealing that the degradation of the dye molecule was initiated through the cleavage of the -N=N- bond before finally being converted to organic acids.
基金
supported by National Natural Science Foundation of China(Nos.50908237,51076142)
the Open Foundation of the State Key Laboratory of Clean Energy Utilization of China(No.ZJUCEU2009008)
