微波强化光催化对直接耐酸大红4BS的降解  

Investigation on Microwave-enhanced Photocatalytic Degradation of Direct Scarlet 4BS

作　　者：梁存珍[1] 刘卫国[1] 陈家庆[1] 孔惠[1] 桑义敏[1] 

机构地区：[1]北京石油化工学院环境工程系,北京102617

出　　处：《环境科技》2011年第4期1-4,共4页Environmental Science and Technology

基　　金：北京市科技新星资助项目(2008B25);环境治理与调控技术北京市优秀教学团队资助项目(PHR201107213)

摘　　要：采用微波无极灯强化光催化对直接耐酸大红4BS的降解进行研究。初步考察反应温度、微波功率、pH值、催化剂TiO2浓度、曝气量、直接耐酸大红4BS初始浓度、外加氧化剂H2O2量等因素对直接耐酸大红4BS降解效果的影响。实验结果表明,反应最佳温度是55℃、最佳催化剂TiO2投加量为6 g/L;较低pH值、高微波功率、外加氧化剂H2O2有利于直接耐酸大红4BS的降解。与常规的光催化相比,微波减弱pH值和染料初始浓度对降解效率的影响。在优化工艺参数和未加H2O2条件下,反应4 h后,质量浓度为500 mg/L的直接耐酸大红4BS降解率达到90%。The photocatalytic decomposition of direct Scarlet 4BS was investigated in microwave-enhanced photocatalysis with microwave electrodeless lamp as light source. The effects of different operating parameters such as temperature, microwave power, pH, concentrations of TiO2, initial concentrations of direct Scarlet 4BS, and addition of H202 oxidant were examined. The results show that the optimal amount of TiO2 is 6 g/L and the optimal temperature is 55 ℃ under the experimental conditions. The photodegradation was favored with high microwave power, low initial pH and addition H202. Compared with the conventional photocatalysis, microwave irradiation weakens the effects of initial pH and dye initial concentration on the degradation. Under the optimized operating conditions and without H2O2, the removal efficiency reached 90% within 4h when the initial concentration of .direct Scarlet 4BS was 500 mg/L.

关 键 词：微波强化光催化 无极灯 直接耐酸大红4BS 

分 类 号：X5[环境科学与工程—环境工程]