The degradation of phenol in aqueous solution with the combination of microwave and ozone(MW/O3)was studied with laboratory-scale experiments.Effects of ozone dose,pH value,initial phenol concentration and reaction temperature on the reaction kinetics were investigated.In all cases,the degradation of phenol follows a pseudo-first-order kinetics relation.MW/O3 combined technology is favorable for enhancing the removal efficiency of phenol,with the enhancement factor of the first-order kinetics constant being around 3.6.Experimental results showed that the synergetic effect of MW/O3 combined technology was obvious and up to 99 % of phenol was removed after 30 min reaction with initial phenol concentration of 100 mg·L-1,ozone dose of 1.1 mg·min-1,pH value of 9—11,and reaction temperature of 25℃.
The synergetic kinetics of phenol degradation in water by using microwave/H2O2(MW/H2O2)system was studied.It was found that phenol degradation followed pseudo-first order reaction and was significantly enhanced and the rate constant enhancement was about 5.98 in the combined MW/H2O2 system.This fact indicated that there existed synergetic effects in the MW/H2O2 process.A simplified mechanistic model for phenol degradation was proposed to account for the combined contribution of MW radiation,H2O2 oxidation and hydroxyl radical,and was well suitable for the phenol degradation in the presence of superfluous H2O2.
