▎ 摘　　要

Degradation of pesticide residues by ultrasonic-assisted photocatalytic technology with a semiconductor catalyst is an effective method to reduce environmental wastewater pollutant. At present, researchers devote enormous time and energy to exploit new-type semiconductor catalysts which have larger specific surface area and suitable bandgap energy. While, there are few researches to explore the effect on the semiconductors composites with different dimensional material. Herein, we successfully immobilized spherical-like AgCl0.75Br0.25 particles on skeleton surface of reduced graphene oxide (RGO) with different dimensions (0D, 2D, 3D) via the photo-ultrasonic method for the first time. The results indicated that AgCl0.75Br0.25 demonstrated distinctly different specific surface areas, light harvesting ability and charge carrier separation efficiency after coupling with different dimensional RGO. Particularly, the 3D RGO/AgCl0.75Br0.25 composite revealed the optimal ultrasoundassisted photocatalytic activity for removal of chloridazon (Chl), and its degradation efficiency had reached at 75.2%, which was about 1.83, 1.27, and 1.19 times higher than that of pristine AgCl0.75Br0.25 (41%), 2D RGO/ AgCl0.75Br0.25 (59.2%) and 0D RGO/AgCl0.75Br0.25 (63.4%), respectively. Moreover, the cyclic degradation experiments suggested that the 3D RGO/AgCl0.75Br0.25 composite had excellent sono-photocatalytic stability and repeatability. The radicals trapping experiments revealed that center dot OH and h(+) were the main reactive species in the ultrasound-assisted photocatalytic degradation process, and the possible mechanism was further proposed based on above results. Overall, this work could provide an effective strategy to construct the heterojunction semiconductors with excellent ultrasound-assisted photocatalytic activity to alleviate environmental wastewater pollution.