Oxidation of acetic acid by molecular sieve TS-1 catalyzed O3/H2O2
TS-1分子筛催化O3/H2O2氧化乙酸

The effect of molecular sieve TS-1 on the degradation of acetic acid by O3/H2O2 was investigated under acidic conditions.The parameters were optimized and its mechanism was also anaylzed.The experimental results indicate that the presence of TS-1 can greatly improve the efficiency of ozonation at pH 2.8.The removal rate of acetic acid(initial concentration: 100 mg/L) by molecular sieve TS-1 O3/H2O2(O3/H2O2/TS-1) reached 58.7% after 60 min at pH 2.8 when the dosages of H2O2 and TS-1 were 3 g/L and 5 g/L,respectively.The degradation rate of acetic acid by O3/H2O2/TS-1 was only 19.8% at pH 0.8,greatly lower than that at pH 2.8.The Rcts of O3/H2O2 and O3/H2O2/TS-1 calculated by the relative method were 1.62×10-8 and 8.67×10-7,indicating that O3/H2O2/TS-1 system could generate more hydroxyl radicals.The possible reaction mechanism was speculated based on the results of acetic acid removal rate,hydrogen peroxide and ozone concentrations in water.These experimental results are of great significance to broaden the application scope of O3/H2O2 system because TS-1 can improve its oxidative efficiency under acidic conditions.