Construction And Modification Of SPR Metal-rutile Nanocomposite And Visible Light Catalytic Alcohol Selective Oxidation Performance

As an environmental friendly process,The emergence and application of photocatalytic selective oxidation has greatly satisfied people's requirements on energy and environment.TiO₂ is studied by one of the most widely photocatalysts.Compared with the TiO₂ of anatase,rutile is often neglected because of its relatively low specific surface area and low photocatalytic activity.However,due to the narrow band gap of rutile,it has partial visible light response which provides favorable conditions for the utilization of solar energy.Therefore,it is necessary to develop visible light responsive TiO₂ based photocatalyts with large surface area for enhanced photoactivity.The SPR Au/rutile TiO₂ complexus is extremely useful to extend visible light response,and this is rarely applied to photocatalytic selective oxidation.In addition,modification of photocatalyts with HF is very useful to improve the charge separation and study the photocatalytic selective oxidation mechanism of organic compounds.The specific experimental contents are as follows:First of all,we synthesized TiO₂ with large specific surface area and constructed Au/rutile TiO₂ nanocomposites.TiO₂ nanorods with large specific surface area were synthesized by the a low-temperature hydrothermal process in the presence of HCl.Compared with the traditional anatase and rutile,the rod structure of TiO₂ was advantageous to the transmission photogenerated charge.On this basis,Au modified TiO₂ nanorods to expand the visible light response is explored.Using deposition-precipitation?DP?method,deposition of light method and the preparation method of Au nanorod to modify rutile TiO₂ and be compared,the obtained results show that obtained samples through DP method show strong SPR effects and is useful to extend visible light response,and their surface plasmon resonance effect was further improved when the prepared samples were calcined at different temperatures and modified at different quantities to improve the photocatalytic selective oxidation activity.Secondly,we further prepared HF modified Au/rutile TiO₂ nanocomposites using wet chemical method to explore the influence of HF modification for the selective oxidation of organic compounds under visible light.The prepared samples showed the captured degree of photogenerated electrons was significantly improved,mainly due to the activation of O₂ by HF modification,which further improved the adsorption capacity of O₂ on the surface of rutile TiO₂.The produced photogenerated electrons were captured by O₂ and the life of photoelectric charge was prolonged,thus photocatalytic activity was enhanced.At the same time,HF modified samples were used in oxidation of other alcohol to show similar activity patterns.