Effect Of Hydrogen Peroxide On The Degradation Of 2, 6-dimethylaniline By Fenton Processes

摘要

2, 6-Dimethylaniline, an important raw material in the manufacture of pesticides, dyestuffs, antioxidants, pharma-ceuticals and other products, is considered as toxic and carcinogenic.The effect of H_2O_2 on 2, 6-dimethylaniline degradation, COD removal, rate constants and H2O2 efficiency were studied using Fenton and electro-Fenton processes.Ti/IrO_2/RuO_2 (DSA) anodes and stainless-steel cathodes were used as electrodes for electro-Fenton process.Degradation experiments were conducted by varying the H_2O_2 concentration from 5 mM to 150 mM using 1 mM of Fe~(2+) and 1 mM of 2, 6-dimethylaniline at an initial pH of 2 and electrical current at 1.43 A.The highest 2, 6-dimethylaniline removal for Fenton process was 80.3%, when 120 mM of H_2O_2 was applied and COD removal was 27% at 20 mM of H_2O_2.However, electro-Fenton process had a 2, 6-dimethylaniline removal efficiency of 100% at H_2O_2 concentrations greater than 20 mM and its highest COD removal efficiency was 42.57% at 120 mM of H_2O_2.Results showed that the high concentration of H_2O_2 enhanced the COD removal.In addition, it is also found that the degradation of 2, 6-dimethylaniline underwent a faster reaction rate than COD removal.From the results, we can conclude that electro-Fenton process had a higher efficiency for COD removal and 2, 6-dimethylaniline's degradation.