Study On Preparation Of Graphene-CuO Nanocomposites And Ultrasonic Catalytic Performance

In recent decades,the problem of environmental pollution has become increasingly serious with the rapid development of industrial manufacturing.A large amount of industrial wastewater and organic dyes have seriously polluted the water source and greatly damaged human health.Scientists from all over the world are spared no effort to explore efficient methods for the treatment of water pollution.In this thesis,the ultrasonic catalytic degradation technology was used to achieve the high-efficiency degradation of pollutants.In this paper,an improved solvothermal method was used to grow monoclinic copper oxide particles on the surface of reduced graphene(rG),thereby quickly and cheaply preparing three kinds of graphene-copper oxide nanocomposites with different mass ratios: rG-CuO(2:1),rG-CuO(3:1)and rG-CuO(4:1).The composition,microstructure and internal structure of the nanocomposites were systematically investigated by X-ray diffraction(XRD),field emission scanning electron microscopy(SEM),transmission electron microscopy(TEM),high-resolution scanning transmission electron microscopy(STEM),High angle annular dark field image(HAADF),energy dispersive X-ray spectroscopy(EDS),Raman spectroscopy and UV-Vis absorption spectroscopy,et al.The analysis and research found that the morphology and structure of nanocomposites formed by dispersing CuO nanoparticles on the two-dimensional surface of graphene materials show significant changes compared to pure reduced graphene oxide(rG).In addition,the degradation performance of the prepared rG-CuO nanocomposites were investigated using rhodamine B(RhB)and methyl orange(MO)as pollutant models under ultrasonic conditions.The results show that the prepared graphene-copper oxide nanocomposites exhibited excellent ultrasonic catalytic degradation performance.The catalytic degradation efficiency of rG-CuO(2:1)to rhodamine B(RhB)and methyl orange(MO)reached 90% and 87%,respectively,which were 2.1 and 4.4 times of reduced graphene oxide under ultrasound irradiation.Moreover,the possible mechanism of the degradation of pollutants by ultrasound and catalyst was proposed in this paper,the synergistic effect between the catalyst and the ultrasound provided power for reactions that cannot be performed under normal conditions.This kind of low-cost and high-efficiency nanomaterial catalyst shows the potential application in the field of water pollution treatment,and provides a green and efficient new approach for the cleaning of water resources.