Abstract:

The degradation of phenol in aqueous solution by microwave-assisted chlorine dioxide(MW/ClO₂)oxidation was studied with laboratory-scale experiments. The affecting factors such as initial ClO₂ concentration，MW power，pH value，initial phenol concentration and reaction temperature，and reaction kinetics were investigated. For all oxidation processes by alone MW radiation or ClO₂ oxidation as well as combined MW/ClO₂，phenol degradation followed pseudo-first-order kinetics. The overall reaction rates were significantly enhanced in the combined MW/ClO₂ system，mainly because microwave could accelerate chlorine dioxide to generate chlorine radical(·Cl)and other reactive oxygen intermediates. The observed synergetic effects in MW/ClO₂ process resulted in an increased in the net reaction rate by a factor of 1.4. The results also showed that the effect of initial ClO₂ concentration，MW power，pH value and initial phenol concentration on reaction rate is significant，