人造沸石催化臭氧处理对氯苯酚废水的研究

Treatment of P-Chlorophenol Wastewater by Artificial Zeolite Catalytic Ozonation

利用人造沸石催化臭氧降解对氯苯酚(4-CP)废水,考察不同条件下去除对氯苯酚的效果。结果表明:反应20min内人造沸石催化臭氧去除4-CP的效果明显高于单纯臭氧氧化;增加臭氧浓度和沸石投量均有利于4-CP的降解,但臭氧利用率降低;溶液p H值增加,4-CP降解率提高,在溶液呈酸性和中性时p H的提高对4-CP降解率影响不大;升高温度4-CP降解率增大;4-CP初始浓度越小,降解率越大。在上述实验条件下,沸石催化臭氧降解4-CP的反应符合假一级反应动力学,其相关系数R2=0.9918,表观反应速率常数kA=7.78×10-2 s-1。碳酸钠能抑制沸石催化臭氧降解对氯苯酚的效率,间接表明反应过程中产生了·OH。人造沸石具有较长的使用寿命。

Degradation of P-chlorophenol （4-CP） by artificial zeolite catalytic ozonation in a simulated water was investigated. The results showed that P-chlorophenol was degraded by artificial zeolite catalytic ozonation process efficiently in comparison to ozone alone in 20 minutes, increasing zeolite dosage and ozone concentration enhanced P-chlorophenol removal, but ozone utilization efficiency decreased. The pH had no remarkable effect on the degradation efficiency in the range of pH 2.81-6.81, although it increased with rise of pH. The degradation efficiency also increased with rise of temperature, increased with decreased of P-chlorophenol initial concentration. Under the above conditions of this experiment, the degradation of the phenol followed the apparent pesudo-first-order kinetic model with its correlation coefficient R^2 of 0.9918, and the rate constants kA was 7.78×10^-2 s^-1. By investigating the effect of sodium carbonate on P-chlorophenol removal, it is concluded that hydroxyl radical was produced in the process. Artificial zeolite had a relatively longer lifetime.