1 INTRODUCTION
In recent years, the use of the titanium dioxide
(TiO2) as photocatalytic semiconductor material in
environmental clean-up operations has aroused great
interest due to its non-toxic nature, photochemical
stability and low cost, particularly when sunlight is
used as the source of irradiation [14]. But the shortcomings
of conventional TiO2 catalyst lie in the low
photon utilization efficiency and the difficulty of recovery
from reaction medium [57]. Therefore, much
work has focused on its modification and immobilization
[813].
Although a great deal of research has been conducted
on the photocatalytic reactions, only a few studies
have been reported for the photocatalytic degradation
kinetics, and the kinetics of photocatalytic oxidation
of organic compounds are not clear. However, most researchers
believe that the photocatalytic oxidation reaction
of organic compounds is a surface reaction, and
the rate equation was often expressed by the LangmuirHinshelwood
(L-H) model as follows
1 INTRODUCTION
In recent years, the use of the titanium dioxide
(TiO2) as photocatalytic semiconductor material in
environmental clean-up operations has aroused great
interest due to its non-toxic nature, photochemical
stability and low cost, particularly when sunlight is
used as the source of irradiation [14]. But the shortcomings
of conventional TiO2 catalyst lie in the low
photon utilization efficiency and the difficulty of recovery
from reaction medium [57]. Therefore, much
work has focused on its modification and immobilization
[813].
Although a great deal of research has been conducted
on the photocatalytic reactions, only a few studies
have been reported for the photocatalytic degradation
kinetics, and the kinetics of photocatalytic oxidation
of organic compounds are not clear. However, most researchers
believe that the photocatalytic oxidation reaction
of organic compounds is a surface reaction, and
the rate equation was often expressed by the LangmuirHinshelwood
(L-H) model as follows
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