Introduction: The photocatalytic degradation of dyes has been investigated throughout the
world irrespective of the level of science in that country. The normal variables considered are the concentration
of oxidising species, the concentration of the dye employed, the catalyst used and intensity
and source of photons applied for degradation studies. The kinetic data obtained on the decolorization
have usually been treated with pseudo first order kinetic expression even there are some exceptions.
Conclusion: This presentation addresses the limitations of the consideration of this topic under these
experimental parameters and shows how the study can be directed in future.
Keywords: Dye degradation, photocatalytic degradation, semi-conductor photo-catalysis, reactive oxygen species, pollution
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