超声波协同光催化处理氯酚废水影响因素研究

Study on Influencing Factors of Sonophoto-Degradation of 2,4-Dichlorophenol

研究了影响超声波协同光催化处理氯酚废水的主要因素。通过改变废水中的TiO2浓度、溶解氧(DO)含量、pH值、温度以及超声波功率,考察它们对2,4-二氯酚(DCP)降解的影响。实验表明:反应溶液中TiO2的最佳浓度较低,仅为0.01g·L-1;提高溶液中溶解氧的含量和超声波的功率有利于2,4-二氯酚的降解;酸性和碱性条件比中性条件更有利于2,4-二氯酚降解;温度对反应的影响不明显,但当其升高到60℃时,2,4-二氯酚的降解率明显下降。

Factors are investigated that influencing sonophoto-degradation of 2,4-dichlorophenol （DCP） such as TiO2 concentration, dissolved oxygen（DO） concentration, pH, temperature and ultrasonic power. The results indicate that the optimum TiO2 concentration is very low, only 0.01g ·L^-1. High concentration of dissolved oxygen and ultrasonic power in the solution are good for sonophoto-degradation of 2,4-DCP. The rates of reaction in acidic and alkaline conditions are faster than that in neutral condition. In addition, temperature affects sonophotoeatalysis faintly. But when the temperature in the solution rises to 60℃, the rate of reaction decrease rapidly.