Fig. 4
a Effect of catalysts dose on ultrasound assisted photocatalytic degradation of isoproturon and b triasulfuron (Conditions: pH 7 for isoproturon and pH 7 and pH 6 using Cu/ZnO and Ni/ZnO for triasulfuron, irradiation time (30 min), temperature 25 °C and herbicides concentration (50 µg mL.−1) in the presence of sonication and visible light)