A comparative study on the photocatalytic efficiency of ZnO thin films prepared by spray pyrolysis and sol-gel method

► Photocatalytic ZnO films prepared by spray pyrolysis and sol-gel. ► Effect of thermal treatment temperature on the photocatalytic efficiency. ► Photocatalytic degradation of Malachite Green and Reactive Black 5 under UV light. ► Comparison of photocatalysis with ZnO films coated on aluminum foil and glass.