摘要
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8mm、输入电压为8kV时,降解效果较好。其中弱碱性环境下(pH=8.4)降解效果最好,40min后茜素红浓度降为0.26mg·L-1;在弱酸性环境(pH=5.8)中处理45min后,茜素红浓度为1.61mg·L-1;而在中性环境(pH=7.0)中降解效果较差,处理45min后茜素红残留浓度为5.70mg.L-1。溶液中的O3是推动氧化反应进行的主要因素。
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.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2007年第10期2595-2600,共6页
CIESC Journal
基金
广东省科技计划项目(2005B50101001)~~
作者简介
雪晶（1981-），女，博士研究生。
联系人：陈砺。Correspondingauthor：Prof．CHENLi．E—mail：celichen@scut．edu．cn
