介质阻挡放电等离子体对茜素红溶液的降解

利用介质阻挡放电等离子体法对染料茜素红溶液进行降解。考察了放电间距、输入电压及溶液pH值对茜素红降解效果的影响，并通过测定放电过程溶液中活性粒子O₃的浓度，探讨了促使茜素红降解的主要因素。结果表明，高压电极与液面间距为8 mm、输入电压为8 kV时，降解效果较好。其中弱碱性环境下（pH=8.4）降解效果最好，40 min后茜素红浓度降为0.26 mg·L^-1，在弱酸性环境（pH=5.8）中处理45 min后，茜素红浓度为1.61 mg·L^-1，而在中性环境（pH=7.0）中降解效果较差，处理45 min后茜素红残留浓度为5.70 mg·L^-1。溶液中的O₃是推动氧化反应进行的主要因素。

Degradation of alizarin red solution in DBD plasma

Non thermal plasma processing using a dielectric barrier discharge（DBD）plasma was studied as a method for the degradation of the alizarin red，a kind of anthraquinone dye，dissolved in waterThe effect of several parameters，such as discharging gap，input voltage and the pH values of solution，were investigatedThe results showed that the DBD plasma could degrade the stubborn anthraquinone dye effectivelyIt was found that the concentration of alizarin red solution decreased to 0.26 mg·L^-1 from an initial concentration of 100 mg·L^-1 at the pH value of 84 in 40 min，while the concentration decreased to 1.61 mg·L^-1 at the pH value of 5.8 and 570 mg·L^-1 at the pH value of 7.0 in 45 minIt was also found that the optimum operation condition required a gap of 8 mm and an input voltage of 8 kV，which facilitated generating symmetrical discharging channels，the primary cause of degradation，as well as active speciesThe concentrations of O₃ in the aqueous phase in the presence of buffer solution with different pH values were measuredFurthermore，the experimental results showed that the change of alizarin red concentration was related to the concentration of O₃，an active species with strong oxidation ability，which was important to facilitate the breakdown of organic pollutant.