▎ 摘　　要

The catalytic properties of graphene oxide (GO) - Ag nanocrystals are investigated to understand the effects of the size and morphology in the selective oxidation of cyclohexane. The GO-Ag nanoparticle composites (GO-Ag NPs) with smaller size show higher catalytic activity than those with bigger Ag nanoparticles, while GO-Ag nanorod composites (GO-Ag NRs) perform better catalytic property than GO-Ag NPs. The highest cyclohexane conversion of 37.0% with the selectivity of 94.0% to cyclohexanol and cylohexanone (KA oil) is obtained by using the photocatalysts of GO-Ag NRs under solar light irradiation at room temperature. The higher catalytic activity of GO-Ag NRs is caused by the stronger Surface Plasmon Resonance (SPR) effect of Ag NRs, and its facilitated generation of (OH)-O-center dot radicals. Both GO-Ag NPs and GO-Ag NRs possess great durability without evident decline of conversion efficiency and selectivity after five repeated consecutive runs. The research and finding in this work may pave a way for the development of high-performance catalysts and green chemical production processes. (C) 2016 Elsevier B.V. All rights reserved.