催化臭氧氧化染料溶液的研究

采用催化臭氧化技术降解染料废水,以甲基紫溶液为目标污染物,研究了过渡型金属离子的类型,Fe2+的浓度,溶液初始pH值,染料浓度和正丁醇等因素对其降解率的影响。实验结果表明:臭氧氧化甲基紫溶液的过程中,加入一定浓度的过渡型金属离子对甲基紫的去除具有促进作用;当臭氧浓度为16 mg/L,一定浓度范围内,Fe2+催化臭氧化的效果随着浓度的增加而增加,但Fe2+浓度为13 mg/L时,甲基紫的降解率下降;在酸性范围时,pH值增大其降解率会减小;染料浓度增加,甲基紫的降解率减小,但是其绝对降解值会增加;正丁醇的加入抑制氧化反应的进行,甲基紫的降解率下降,说明催化臭氧化过程中有羟基自由基产生。染料降解过程符合一级反应动力学规律。

Research on catalytic ozonation of dye solution

Catalytic ozonation was used to eliminate methyl violet. The effects of different transition metal ions, Fe²⁺ concentration, the initial solution pH, dye concentration and N-butanol on its degradation rate were studied. The experimental results showed that adding to a certain concentration of transition metal ions had an active impact and promoted methyl violet removal. Under the condition of O₃ concentration of 16 mg/L, the remove rate of methyl violet increased with increasing Fe²⁺ concentration in the beginning, and then decreased when Fe²⁺ concentration was more than 13 mg/L. The degradation efficiency decreased with increasing pH in acidic condition. The higher initial dye concentration was, the lower degradation rate was, but the higher degradation absolute value was. N-butanol had a negative impact and inhibited the velocity of oxidizing reaction and the degradation efficiency methyl violet decreased, which indicated that hydroxyl radical was generated during the catalytic ozonation process. The degradation reaction of methyl violet by catalytic ozonation followed first-order law.