NAVNEET BHULLAR1 AND DHIRAJ SUD
Abstract
In the present study, photocatalytic degradation of congo red (CR), an anionic diazo dye has been investigated in a batch reactor using Titania P-25 (surface area: 50 m2/g) as a photocatalyst under UV light in slurry mode. The rate of decolorization was estimated from residual concentration spectrophotometrically. Similar experiments were carried out by varying pH (2-10), amount of catalyst (0.25-2.00 g/L) and concentration (5-100 ppm). The degradation rate of CR was favorable at pH 4. Optimum value of catalyst dose was found to be 1.5 g/L. The complete degradation of CR was achieved in 2.5h under UV irradiation.