气升式环流反应器光催化处理难降解有机污染物试验研究

PHOTOCATALYTIC DEGRADATION OF THE REFRACTORY ORGANIC CONTAMINANTIN AN INTERNAL LOOP AIRLIFT REACTOR

利用气升式环流光催化反应器对难生化降解活性艳红X-3B的光催化降解性能进行了研究。系统分析了底物初始浓度、溶液初始pH、催化剂投加量、反应温度、曝气量以及紫外光辐射强度等因素对底物光催化降解反应的影响。结果表明,在反应溶液pH为4-10、催化剂质量分数为0.5 g/L、曝气量为2.5 m^(3)/h、活性艳红X-3B初始浓度为50 mg/L的条件下,活性艳红X-3B光催化3 h后的降解率可达到85%以上。反应动力学研究结果表明,活性艳红X-3B、光催化降解可用Langmuir-Hinshelwood模型描述。建立了以反应时间、底物初始浓度、紫外光强度和曝气量为变量预测体系对活性艳红X-3B的光催化降解效果经验模型,预测值与试验值间的决定系数为0.958,可为后续放大试验提供借鉴。

The photocatalytic degradation of reactive brilliant red X-3B was investigated in an internal loop airlift photocatalytic reactor.The effects of initial substrate concentration,catalyst load,initial solution pH,aeration amount,temperature,and UV intensity on the photocatalytic degradation reaction were systematically analyzed.The results showed that the degradation rate of active brilliant red X-3B could reach more than 85%under the conditions of a pH of 4-10,a catalyst dosage of 0.5 g/L,an air flowrate of 2.5 m^(3)/h,an active brilliant red X-3B concentration of 50 mg/L after 3 h photocatalytic reaction.The results of the reaction kinetic studies indicate that the degradation of reactive brilliant X-3B by photocatalytic treatment can be described by the Langmuir-Hinshelwood model.An empirical model was established to predict the photocatalytic degradation performance of active brilliant X-3B with the variables of reaction time,substrate concentration,UV light intensity and aeration amount.The coefficient of determination between the predicted and experimental value was 0.958,which can provide theoretical guidance and experience for the following amplification experiments.