Mixed ZnO-TiO2Suspended Solution as an Efficient Photocatalyst for Decolonization ofa Textile Dye from waste water

Introduction: In this research mixed ZnO and TiO2 was used for degradation of an azo dye (Direct Blue 71). Material and Methods: In comparison with just TiO2 or ZnO as photocatalyst, mixed photocatalyst (ZnO/TiO2) is more efficient catalyst for degradation of dye under UV irradiation. The progress of the reactions was monitored spectrophotometrically by measuring the absorbance of dye at special wavelengths. The effects of various parameters such as ZnO/TiO2 ratio, amount of photocatalyst, pH,initial dye concentration and irradiation time on decolorization rate were systematically investigated. Results: Results show that approximately 90 % of Direct Blue 71 has been eliminated after 70 minutes and optimized condition.