Oxidation of Anilines with Chlorine Dioxide in Wastewater

Oxidative behaviors of three Toxic pollutants including aniline, p-toludine and p-chloroaniline with ClO2 in water were studied with HPLC. The removal rates of anilines were used as criteria in this experiment. Effect of the ClO2 concentration, pH and reaction time on the removal rate of anilines were discussed. The results showed that for 1mmol.L-1 aniline, p-toludine and p-chloroaniline, the optimal process conditions were as follows: ClO2 concentration 5mmol-L-1, pH8 for aniline, pH8-9 for p-toludine and pH7-8 for p-chloroaniline, reaction time were 60,30 and 20min respectively. The removal rates of anilines were more than 90%, revealing that the oxidative methods of ClO2 was very feasible and efficient for Anilines removal. Two intermediates p-aminophenol and azobenzene were detected by means of GC(-)MS. And the possible reaction pathway was proposed.