Abstract
AbstractHeterostructured ZnO/TiO2 nanophotocatalysts were prepared by precipitation method in molar ratio of 1:9 (ZT9), 1:1(ZT), 9:1(Z9T), and ZnO was also prepared with the same method. The prepared photocatalysts were characterized with X-ray diffraction, scanning electron microscopy, and UV–Vis spectroscopy. The average crystallite size of samples was calculated to be about 20–25 nm. The band gap of ZnO/TiO2 photocatalysts is smaller than that of prepared ZnO (3.70 eV). Their photocatalytic activity was evaluated using acid orange 7 (AO7) as a model organic compound. The rate of decolorization was estimated from residual concentration spectrophotometrically, and mineralization rate was studied by measuring COD. Coupled oxide ZT9 has higher photocatalytic efficiency (81.09%) than ZnO prepared (39.98%), Degussa P25 TiO2 (69.09%) or TiO2 Merck (26.14%) at pH 7. ZT and Z9T have better photocatalytic efficiency than Degussa P25 TiO2 at pH 8. The results clearly indicate that ZT9 is found to be most active i...
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