Nanometer La2O3/TiO2 powder was obtained from tetrabutyl titanate by sol-gel method. The size, structure and appearance were analyzed by TEM and XRD. Phenol solution was treated by US (Ultrasound)/ UV ( Ultraviolet) synergetic catalysis technology and the major influencing factors such as the sound intensi- ty, initial pH value of solution, initial phenol concentration, the amount of catalyst and medium temperature were examined. The results show that US/UV synergetic technology is supesior to each of ultra...