Abstract: The kinetics of photodegradation of methylene blue over UV lightilluminated titania
particles in aqueous suspensions has been studied withdifferent initial methylene blue
concentrations and TiO2 particle sizes. The degradationrate increases with the decrease of
initial concentration and particlesize. A quasi-experienced model for photodegradation rate
is derivedbased mainly on the coinstantaneous effects of different initialconcentrations
and particle sizes. The mathematical relationships ofmodel parameters with initial
concentration and particle size are given.The model results of the photodegradation rate of
methylene blue arecoincident with the experimental data.

Key words: kinetics, photocatalytic, titaniaminipage

摘要： The kinetics of photodegradation of methylene blue over UV lightilluminated titania
particles in aqueous suspensions has been studied withdifferent initial methylene blue
concentrations and TiO2 particle sizes. The degradationrate increases with the decrease of
initial concentration and particlesize. A quasi-experienced model for photodegradation rate
is derivedbased mainly on the coinstantaneous effects of different initialconcentrations
and particle sizes. The mathematical relationships ofmodel parameters with initial
concentration and particle size are given.The model results of the photodegradation rate of
methylene blue arecoincident with the experimental data.

关键词: kinetics;photocatalytic;titaniaminipage