| Summary: | 碩士 === 國立高雄師範大學 === 化學系 === 102 === In recent years, graphene, with many excellent properties, has affected a lot of research attentions. Studies about graphene or graphene oxide-based composites have been widely developed and applied, such as the synthesis of chitin/chitosan-based graphene oxide–ZnO hybrid composites for better properties. However, recent studies had not yet carried out for composite materials of graphene-based chitosan – ZnO, so our research was focused on the rGO / CS / ZnO composite.
In order to identify rGO / CS / ZnO composite, we used FT-IR spectroscopy, X-ray powder diffraction, UV-Vis spectroscopy, and thermogravimetric analyzer to analyze the composite. In FT-IR, XRD and UV-Vis spectrums show that composite is not only successfully synthesized, but also observed that the nanocomposite has good heat resistance.
According to literatures over the past few years, some people had studied about kinetics of adsorption of methylene blue of GO/ZnO, GO/Chitosan and other graphene-related composite material. Other people had used light at specific wavelength to take degradation experiments and explored the kinetics of photodegradation. In this study, the experimental data can be well fitted with the Langmuir isotherm equation. Kinetic studies show that adsorption process followed the second order reaction model. Until the adsorption reactions reach equilibrium, altering amounts of composite materials at 365nm wavelength in light degradation experiments. The photocatalytic degradation of Methylene blue by the rGO/CS/ZnO composite under visible light obeys first order kinetics.
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