Kinetics of ultrasonic degradation of phenol in the presence of TiO2 particles.
The degradation of phenol by ultrasonic irradiation in the presence of TiO2 was investigated in complete darkness. The effects of amount of TiO2 and the combination of TiO2 addition with gas (air or oxygen) supply on the degradation kinetics of phenol and the formation of the reaction products were examined. The degradation rate of phenol increased with the amount of TiO2. As the dissolved oxygen concentration increased by supplying oxygen, the degradation rate of phenol also increased. A kinetic model for the disappearance of phenol was proposed. The model takes into account the OH radical formation by direct water degradation, indirect degradation by oxygen atom and indirect degradation by TiO2 catalysis. The calculated results explained well the fact that a higher amount of TiO2 and dissolved oxygen concentration gave faster disappearance rate.
Kubo
Masaki
M
Department of Chemical Engineering, Tohoku University, Aoba-yama 07, Aoba-ku, Sendai 980-8579, Japan.
Matsuoka
Kunihiro
K
Takahashi
Atsushi
A
Shibasaki-Kitakawa
Naomi
N
Yonemoto
Toshikuni
T