Effect of metal ion (common cations with same concentration) on photoassisted bleaching of methylene blue by Nb2O5

The photocatalytic bleaching of textile azo dye Methylene blue has been carried out in the presence of semiconductor Nb2O5 and the progress of reaction was observed spectrophotometrically.The effect of various operating parameters like pH, concentration of the dye, amount of photocatalyst and nature of photocatalyst on the efficiency of the reaction has been studied. Attempts have been made to study the effect of addition of common cations and common ions such as Na+, K+,Ca+2, Ba+, Cl-, SO4 -2 and CO3 -2. It was observed that trace quantities of all the added metal ions increases the reaction rate to some extent. A tentative mechanism has been proposed.

Author(s): Lokesh Gurjar and B. K. Sharma

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