The Preparation Of Graphene Nanocomposites With Photoelectric Adsorption Performance Research

Owing to the synergistic effects combining with the characteristics of the graphene and nanometer materials, graphene based nanocomposites show promise in various application, such as electronic, transparent electrode, sensor, supercapacitors, lithium ion battery and catalysts. This attracts more attention. In this thesis, graphene/polyaniline（PANI）, graphene/Fe₃O₄ and graphene/CdS composites have been prepared and the photoelectric properties, adsorption and photocatalytic performance of these materials were studied. The results of the dissertation are summaried as follows:1. GO/PANI/CdS films were prepared by PANI-modified reduction graphene oxide- in situ methods. Then, the nonlinear optical properties of GO/PANI/CdS were studied. The structure and composition were determined by Fourier transformin frared（FTIR）, X-Ray Diffraction（XRD）, scanning electron microscope（SEM）, transmission electron microscope（TEM）, thermogravimetry（TG） and UV-vis absorption instruments. Results of Z-scan show that, the third-order nonlinear absorption coefficient of GO/PANI/CdS film was-4.3cm/GW, which is better than that of GO/PANI（-2.4cm/GW） and PANI（-1.5cm/GW）.2. Graphene/Fe₃O₄ nanocomposites were successfully prepared through a one-step solvothermal method. The adsorption properties of composite for removal of methyl orange in aqueous solution were studied. The kinetics of adsorption fits pseudo-second-order model perfectly. The theoretical maximum of adsorption capacity calculated by Langmuir model is 92.59 mg.g-1. After recycling for 5 times, the discoloration degree was still above 95% of the original efficiency, indicating a good durability.3. The graphene/CdS composites were successfully prepared through a one-step solvothermal method,and then the photocatalysis properties of methyl orange were studied. From the orthogonal experiment, it can be concluded that temperature was the most important factor. The adsorption process met the first order kinetic model. The removal rate of graphene/CdS composite was higher than that of pure CdS, indicating the photocatalytic effect of CdS can be improved by graphene.