Sun Zhi-Zhong, Zhao Lei, Ma Jun
School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
Huan Jing Ke Xue. 2005 Nov;26(6):84-8.
Comparative experiments of modified ceramic honeycomb, ceramic honeycomb-catalyzed ozonation and ozonation alone were conducted with nitrobenzene as the model organic pollutant. It was found that the processes of modified ceramic honeycomb and ceramic honeycomb-catalyzed ozonation could increase the removal efficiency of nitrobenzene by 38.35% and 15.46%, respectively, compared with that achieved by ozonation alone. Under the conditions of this experiment, the degradation rate of modified ceramic honeycomb-catalyzed ozonation increased by 30.55% with the increase of amount of catalyst to 5 blocks. The degradation rate of three process all increased greatly with the increase of temperature and value of pH in the solution. But when raising the pH value of the solution to 10.00, the advantage of modified ceramic honeycomb-catalyzed ozonation processes lost. The experimental results indicate that in modified ceramic honeycomb-catalyzed ozonation, nitrobenzene is primarily oxidized by *OH free radical in aqueous solution. The adsorption of nitrobenzene is too limited to have any influence on the degradation efficiency of nitrobenzene. With the same total dosage of applied ozone, the multiple steps addition of ozone showed a much higher removal efficiency than that obtained by one step in three processes. Modified ceramic honeycomb had a relative longer lifetime.
以硝基苯作为模型有机污染物，开展了改性陶瓷蜂窝、陶瓷蜂窝催化臭氧化和单独臭氧化的对比实验。结果发现，与单独臭氧化相比，改性陶瓷蜂窝和陶瓷蜂窝催化臭氧化过程可分别使硝基苯的去除效率提高38.35%和15.46%。在本实验条件下，随着催化剂用量增加至5块，改性陶瓷蜂窝催化臭氧化的降解率提高了30.55%。随着溶液温度和pH值的升高，三种工艺的降解率均大幅提高。但当将溶液pH值提高到10.00时，改性陶瓷蜂窝催化臭氧化工艺的优势消失。实验结果表明，在改性陶瓷蜂窝催化臭氧化中，硝基苯主要被水溶液中的·OH自由基氧化。硝基苯的吸附作用过于有限，对硝基苯的降解效率没有任何影响。在臭氧总投加量相同的情况下，三种工艺中臭氧分步投加的去除效率远高于一步投加。改性陶瓷蜂窝具有相对较长的使用寿命。
