Research on catalytic ozonation of dye solution
催化臭氧氧化染料溶液的研究

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.