LAUSR

Abstract The grain size and surface oxygen vacancy concentration of ZnO have great influence on its photocatalytic performance. In this work, caged Iodine-modified ZnO (I-ZnO-n) catalyst with nano-structure and surface oxygen vacancy were successfully prepared by reflux method. The crystal structure, surface properties and optical properties were characterized by XRD, SEM, TEM, RAMAN, ESR and EPR. And the photocatalytic antibacterial activity under visible light has been tested. The results show that the nano-structure I-ZnO-n’s band gap is narrow than ZnO because of the existence of oxygen vacancy. And I-ZnO-n exhibits better antibacterial property than micron-structured Iodine-modified ZnO. The ESR and electrochemical experiments confirm that the I-ZnO-n has much more surface oxygen vacancy and higher separation efficiency of photogenic carriers than micron-structured Iodine-modified ZnO, which results its superior photocatalytic performance.