流动相光催化反应器对苯酚的降解特性研究

On Degradation of Phenol in the Mobile Phase Photocatalytic Reactor

对流动相体系中光催化降解苯酚的反应特性进行实验研究．采用流动相光催化反应装置，以苯酚作为目标污染物，TiO2（Degussa—P25）作为光催化剂，针对吸附、光解、光源强度、曝气量、苯酚初始浓度和催化剂投加量等对降解苯酚溶液的影响进行了研究，并进行了动力学分析，建立了相应的苯酚光催化降解动力学经验方程．实验结果表明，苯酚在流动相光催化反应器中，吸附和光解对悬浮态TiO2催化剂降解苯酚的影响微弱；循环流量为0．5～0．6L／min时光催化降解苯酚效果最好；苯酚初始浓度在10～60mg／L之间时，苯酚的降解遵循表观一级反应动力学规律，表观反应速率常数K—Ksum（0．0006I＋0．0047），其中Ksum=16．783[1／C0]＋0．0556．

The study was aimed at the reaction characteristics of the photocatalytic degradation of phenol in the mobile phase system. By using the mobile phase photocatalytie reaction device, the effects of adsorp- tion,photolysis,light intensity, aeration rate, initial concentration of phenol and catalyst amounts on the degradation of phenol solution were studied with phenol as the target pollutant and titanium dioxide （De- gussa-P25） as the photocatalyst,and the kinetic analysis was carried out to establish the corresponding ki- netics empirical equation of photoeatalytic degradation of phenol. The experimental results show that in the mobile phase photocatalytic reactor, the effects of absorption and photolysis on the suspended TiO2 catalyst to enhance the degradation of phenol is weak;the photocatalytic degradation of phenol is optimal when the circulation flow rate is 0.5-0.6 L/min;and the degradation follows the apparent first-order reaction kinet- ics when the initial phenol concentration is in the range of 10-60 mg/L （the apparent reaction rate con- stant K=Ksum（0. 000 61＋0. 004 7） ,Ksum=16. 783[1/C0]＋0.055 6）.