This review is focused on studies related to the elimination of organic pollutants present in aqueous systems
by titanium dioxide photocatalyst under visible light illumination. The titanium dioxide semi-conductor has
emerged as a very promising technology for the oxidation and mineralization of aqueous organic pollutants because
of its properties such as high stability, low cost and non-toxicity. This photocatalytic process has also been used for the oxidation of organic
pollutants present in air and soil besides water, in addition to the production of electricity and hydrogen in photoelectrochemical
cells fed with organic wastes which renders benefits to the environment. This work covers different approaches reported in the literature
for the degradation of aqueous organic pollutants by heterogeneous titanium dioxide photocatalysis. With attention given to influencing
parameters, such as catalyst preparation, modification, loading and phase, pH, annealing temperature, bias potential application and inorganic
ions. Such parameters are paramount to the photoactivity of this semiconductor, particularly under visible light radiation; conditions
of which are imperative for viable technological green application of the phenomena.
Keywords: Degradation, oxidation, organic pollutants, photocatalysis, remediation, titanium dioxide, visible light.
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