摘要
考察了多种因素对高压脉冲电晕放电等离子体降解废水中苯酚效果的影响 ,同时对苯酚降解过程动力学进行了研究。提高脉冲电压峰值和气体的流量以及降低废水溶液的电导率均可提高苯酚的降解率 ,而醇类化合物的存在却明显降低苯酚的降解效果。苯酚的降解过程符合 1级反应 ,降解速率常数 (k)与降解温度(T)的关系符合 Arrhenius公式。即 C=C0 exp(- kt)、k=Aexp(- Ea/ RT)。当废水的初始 p H值和电导率分别为 7.0和 80μS· cm-1、脉冲峰压和放电频率分别为 32 k V和 6 0 Hz、放电电极直径和放电距离分别为 0 .6mm和 3.0 cm时 ,指前因子 A=36 .0 min-1,表观活化能 Ea=2 4.7k J· mol-1。
The effect of some factors on degradation of phenol in wastewater with pulsed corona discharge plasma was presented in this paper. Furthermore, kinetics of degradation of phenol was also studied. The degradation efficiency of phenol could be raised considerably by increasing the peak voltage of pulse, the flowing rate of gas and by decreasing the electric conductivity of wastewater. The presence of alcohol would decrease the degradation efficiency of phenol by capture of ·OH radicals. The degradation of phenol in wastewater with pulsed corona plasma was a first-order reaction, C=C 0exp(-kt). The correlation between degradation rate constant (k) and reaction temperature (T) could be expressed by Arrhenius equation, k=A·exp(-E a/RT). When initial pH and electric conductivity of wastewater were 7.0 and 80 μS/cm and the peak voltage of pulse and discharge frequency were 32 kV and 60 Hz respectively, and the diameter of discharge electrode and the discharge distance were kept at 0.6 mm and 3.0 cm, the pre-exponential factor A and apparent activation energy Ea were 36.0 min -1 and 24.7 kJ·mol -1 respectively.
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
2002年第4期353-357,共5页
Chemical Reaction Engineering and Technology
基金
国际科学与技术合作重点项目 (2 0 0 1CB7112 0 3)
上海市优先发展学科工程资助
