Zhang Hui, Duan Lijie, Zhang Daobin
Department of Environmental Engineering, Wuhan University, P.O. Box C319 Luoyu Road 129#, Wuhan 430079, China.
J Hazard Mater. 2006 Nov 2;138(1):53-9. doi: 10.1016/j.jhazmat.2006.05.034. Epub 2006 May 17.
The combination of ultrasound and ozone for the decolorization of azo dye, methyl orange, was studied. The effect of ultrasonic power, ozone gas flow rate, gaseous ozone concentration, initial dye concentration, pH and hydroxyl radical scavenger on the decolorization of methyl orange was investigated. The results showed that the synergistic effect was achieved by combining ozone with ultrasonic irradiation for the decolorization of methyl orange. The synergistic effect was more significant when the system temperature was raised due to the heat effect of ultrasonic irradiation. The decolorization of methyl orange fits the pseudo first order kinetic model. The decolorization rate increased with the increase of ultrasonic power, ozone gas flow rate, gaseous ozone concentration. However, the decolorization rate decreased with the increasing initial dye concentration. Either pH or sodium carbonate has little effect on the decolorization rate, indicating that the low frequency ultrasound enhanced ozonation process for the decolorization of methyl orange is mainly a direct reaction rather than radical reaction.
研究了超声与臭氧联合用于偶氮染料甲基橙的脱色。考察了超声功率、臭氧气体流速、气态臭氧浓度、初始染料浓度、pH值和羟基自由基清除剂对甲基橙脱色的影响。结果表明，臭氧与超声辐照联合用于甲基橙脱色可实现协同效应。由于超声辐照的热效应，当体系温度升高时，协同效应更为显著。甲基橙的脱色符合准一级动力学模型。脱色率随超声功率、臭氧气体流速、气态臭氧浓度的增加而增大。然而，脱色率随初始染料浓度的增加而降低。pH值或碳酸钠对脱色率的影响很小，表明低频超声强化臭氧化法对甲基橙的脱色主要是直接反应而非自由基反应。
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