Photocatalytic degradation of AZO dyes by supported TiO2+UVin aqueous solution

The photocatalytic degradation performance of photocatalysts TiO2 supported on 13-X, Na-Y, 4A zeolites with different loading content was evaluated us ing the photocatalytic oxidation of dyes direct fast scarlet 4BS and acid r ed 3B in aqueous medium. The results showed that the best reaction dosage o f TiO2-zeolite catalysts is about 2 g/l and the photocatalytic kinetics fol lows first order for all supported catalysts. The photocatalytic activity o rder of the three series catalysts is 13X type >Y type >4A type. The physic al state of titanium dioxide on the supports is evaluated by X-ray photoele ctron spectra (XPS), powder X-ray diffraction (XRD), BET, and FTIR. (C) 200 0 Elsevier Science Ltd. All rights reserved.