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UV Photolytic Decolorization Study of Synthetic Waste Water Containing Indigo Carmine Dye in Presence of H2O2
Authors: FARTODE A. P., PARWATE D.V.
Number of views: 431
The waste waters containing synthetic dyes could not be treated effectively using
conventional technologies owing to the complex molecular structure and stability of
synthetic dyes. Use of high energy radiations like UV rays either alone or in presence of
H2O2 is considered as the novel technique for treating such effluents. In this work, the
photolytic decoloration of aqueous solutions of Indigo carmine dye with UV rays in
presence of H2O2 has been investigated. The extent of decoloration was followed as a
function of decrease in absorbance, spectrophotometrically at the λ max of 612 nm. The
influence of factors such as exposure time, dye concentration and dose of H2O2 was
studied. Results revealed that the effective decoloration could be achieved only in the
presence of both i.e. UV rays and H2O2.The dose of H2O2 has significant effect on the
rate of degradation. There is a critical value of H2O2 to achieve effective decoloration. As
the dose of H2O2 increased beyond this critical value it was found to have retarding effect
on efficiency of decoloration. It was observed that, as the dye concentration increases,
the rate of decoloration decreases. For all the dye concentrations, the rate of
decoloration was quite high initially, but as the time of exposure was increased, the rate
of decoloration was found to be slow and steady.
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