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 H2O2 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 H2O2. 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.%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4h后,质量浓度为500 mg/L的直接耐酸大红4BS降解率达到90％.
展开▼
