Although many methods have been used to remove organic
contaminants from the wastewater of the textile and dye industries,
advanced oxidation processes such as photodegradation are
the most effective.. The initial step in the photodegradation of
an azo-compound usually involves a reductive cleavage of the azobond,
which leads to the formation of toxic aromatic amines.So, to control the wastewater toxicity, both the effectiveness with
which the azo-compounds are degraded and the absence of toxic
photodegradation intermediates need to be assessed