放电极雾化介质阻挡放电低温等离子体对染料溶液的脱色研究

Plasma Decolorization of Dye Using Dielectric Barrier Discharges with Earthed Spraying Water Electrodes

采用放电极雾化介质阻挡放电装置,以靛蓝二磺酸钠染料溶液为接地雾化水电极,将有玻璃介质保护的平板电极通入60 Hz交流电,在常压空气中放电形成低温等离子体,对染料溶液进行脱色试验.结果表明:随着电压的升高和空气间隙的减小,放电电流增大;在相同处理时间内,随着电压的增大和空气间隙的减小,脱色率逐渐增大.当空气间隙为30 mm,电压为30kV,处理时间为18 min时,染料溶液的脱色率可达95%以上.空气间隙和电压的不同,脱色率每提高1%的能量消耗量不同,空气间隙为30 mm时脱色率每提高1%的最低能量消耗量为34.81 J,电压为25 kV时脱色率每提高1%最低能量消耗量为49.56 J.空气间隙为30 mm,电压为25 kV,可实现在较低的能量消耗下达到较高的脱色率.

The decolorization rate of indigo carmine aqueous solution with a new-type dielectric barrier discharge （DBD） system was investigated. The effect of high voltage and air gaps with discharge system was reviewed, and specific power consumption with different decolorization rates discussed. The aqueous solution of dye was employed as grounding spraying water electrode. The flat electrode, protected by glass dielectric, connects AC 60 Hz high-voltage, and in the ordinary atmospheric pressure it will form atomizing DBD non-thermal plasma between two electrodes. The results show that the decolorization rate increases with the increase in applied high voltage and the decrease in air gaps. When the air gap is 30 mm, and the voltage is 30 kV, the decolorization rate reaches 95% in 18 minutes. Specific power consumption varies with per 1% increased decolorization rate in change of high voltage and air gaps. When the air gap is 30 mm, the minimum energy consumption is 34.81 J. When the input voltage is 25 kV, the minimum energy consumption is 49.56 J. The lower power consumption can get to the higher decolorization rate, when the air gap is 30 mm and the voltage is 25 kV.