Abstract:

This work aims at the degradation of phenol in wastewater by Fenton reagent in microwave field.The degradation experiments were carried out respectively in microwave field and in normal condition,and the corre-sponding reaction kinetic curves were obtained,which were divided into two stages respectively according with the second-order and the first-order rate equations.The effects of reaction temperature and microwave power on the total organic Carbon(TOC)removal were then discussed,and the reaction activation energies were finally estimated.The results show that(1)microwave radiation not only obviously improves the reaction rate and the TOC removal,but also reduces the reaction activation energy;(2)when the microwave powers are 1 00,200 and 600 W,the cor-responding reaction activation energies at the first stage are respectively 9.833,9.139 and 8.579 kJ/mol,and those at the second stage are respectively 28.245,27.560 and 26.710kJ/mol,which are all less than the values in nor-mal condition(10.782kJ/mol in the firs t stage and 30.294kJ/mol in the second stage);and(3)the reaction acti-vation energy decreases with the increase in microwave power.

Key words: microwave, Fenton reaction, phenol, total organic Carbon removal, reaction activation energy