Solar photocatalitic degradation of Vat Yellow 4 dye in aqueous suspension of TiO[sub]2[/sub] - optimization of operational parameters.
Journal Title: Advances in Environmental Sciences - International Journal of the Bioflux Society - Year 2010, Vol 2, Issue 2
Abstract
The photocatalytic decolourisation and degradation of an anthraquinone dye Vat Yellow 4 in aqueous solution with TiO[sub]2[/sub]-P25 (Degussa) as photocatalyst in slurry form has been investigated under solar irradiation and UV irradiation. The study on the effect of various photocatalysts on the degradation reveals that TiO[sub]2[/sub] is the best catalyst in comparison to other commercial photocatalysts. The effects of various operational parameters such as catalyst loading, initial dye concentration and pH on the decolourisation and degradation under solar irradiation in TiO[sub]2[/sub] suspension have been investigated to find out the optimum conditions. The decolourisation and degradation kinetics have been analysed. Both follow first-order kinetics. A study on the effect of electron acceptors on photo oxidation reveals that both decolourisation and degradation increase in the presence of the electron acceptors such as H[sub]2[/sub]O[sub]2[/sub] and (NH[sub]4[/sub])[sub]2[/sub]S[sub]2[/sub]O[sub]8 [/sub]up to an optimum dosage beyond which the enhancement effect is negligible. The comparison between thin-film coating of TiO[sub]2[/sub] and aqueous slurry method reveals that slurry method is more efficient.
Authors and Affiliations
Sullipalayam Kavitha, Pachakoundanpalayam Palanisamy
Keywords
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