| In today’s society,with the rapid development of science and technology,people’s living standards have greatly improved,and environmental and energy issues have become two major issues that people need to solve urgently.Since Fujishima and others first reported in the 1980s that TiO2 can decompose water to produce hydrogen under light,many researchers have devoted themselves to the research of photocatalysis.After decades of development,the rapid development of photocatalysis technology has become a promising solution in the new century.Photocatalytic technology is expected to be a new technology to solve environmental pollution and energy shortage.At present,the application of photocatalytic technology is mainly concentrated in the aspects of pollutant degradation,decomposition of water to produce hydrogen,carbon dioxide reduction,nitrogen fixation,etc.,and some applications have been gradually put into industrialization,and have broad application prospects.However,it is always difficult to break through the two bottlenecks in photocatalysis applications,which are narrow light response range and low quantum efficiency.If effective measures can be taken to improve the photoresponse and quantum efficiency of the photocatalyst,it will be of great significance to the rapid development of photocatalysis technology.The surface plasmon resonance effect of noble metal nanoparticles can enhance the light absorption of the catalyst,and the presence of noble metal nanoparticles can improve the separation efficiency of electrons and holes.Therefore,this paper focuses on the application of surface plasmonic photocatalysts in photocatalysis.The main contents are as follows:The first chapter first introduces the research background of semiconductor photocatalysis,the types of photocatalysts,the mechanism of photocatalysis,the application of photocatalysis and the restrictive factors of semiconductor photocatalysis.Then the research status,synthesis method,reaction mechanism,application and existing problems of surface plasmonic photocatalyst are introduced.Finally,it explains the meaning and content of the topic selection of this thesis.The second chapter mainly introduces the application of Ag/AgCl surface plasmonic photocatalyst in the degradation of methane.The methane degradation rate of Ag/AgCl is approximately 35 times higher than that of TiO2.Systematic experiments and finite-difference time-domain simulated calculations results demonstrate that the SPR effect of Ag NPs can generate a strong electric field,which can polarize the non-polar molecules,make them be adsorbed and lead to the efficient gas degradation.This study broadens the idea of using plasmonic photocatalysts to eliminate gaseous non-polar molecules.The third chapter mainly introduces the application of Ag/AgCl surface plasmonic photocatalyst in the selective oxidation of sulfide to sulfoxide.The Ag/AgX(X=Cl,Br,I)surface plasmonic photocatalyst was synthesized by a simple one-step method.Under simulated sunlight,the synthesized Ag/AgCl exhibits close to 100%selectivity and conversion rate in the selective conversion of thioethers,which is more green,environmentally friendly,economical and efficient than traditional conversion methods.We have discussed the reasons for its good performance through systematic experiments and active species detection methods.The results show that the surface plasmon resonance effect of silver nanoparticles can broaden light absorption and provide more active sites,thereby promoting the selective conversion of thioethers.In our research,we put forward the possible photocatalytic mechanism of this work,which paves the way for the application of Ag/AgX surface plasmonic photocatalyst in the selective conversion of organic matter.It also provides a new idea for its application in the selective conversion of organic matter.The fourth chapter summarizes the work of this article,analyzes the innovations and still existing problems in the thesis and finally looks forward to the next step of the work. |
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