Design Of Photocatalysts Based On Noble Metal SPR Effect And Their Performance In Driving Organic Reactions

The development of human society is inseparable from energy and the environment.Solving the current increasingly serious energy shortage and environmental pollution is an urgent need to achieve sustainable development.Photocatalytic technology based on semiconductor catalytic materials provides us with an ideal new approach for energy utilization and environmental pollution control.However,most semiconductors have a series of problems such as narrow light response range.In recent years,with the cross-melting of multiple disciplines,noble metal particles with surface plasmon resonance effects have been introduced into the photocatalytic system and combined with semiconductors to form plasma photocatalytic materials.Plasma photocatalysts can take advantage of the plasmon resonance characteristics of precious metals to expand the light absorption range and promote the efficient and stable progress of photocatalytic reactions.Based on the above,in this thesis,a series of plasma photocatalysts are designed and their performance in driving organic redox reactions is studied.The specific research content is as follows:1.Preparation of Au@Ag/BiOCl-OV composite photocatalyst and its catalytic performance for the selective oxidation of benzyl alcohol.Au@Ag nanoparticles were synthesized by seed growth method,and Au@Ag were uniformly loaded on BiOCl（BiOCl-OV）with oxygen vacancy with the assistance of3-aminopropyl-triethoxysilane（APTES）to synthesze Au@Ag/BiOCl-OV.Study the selective oxidation performance of benzyl alcohol.During the catalytic process,the coupling effect of Au and Ag SPR expands the light absorption range and enhances the hot electron-hole generation ability.At the same time,the existence of oxygen vacancies as active sites makes the BiOCl-OV surface have a strong O₂ adsorption capacity.The results show that the photocatalytic and selective oxidation of benzyl alcohol by Au@Ag/BiOCl-OV is significantly improved compared to pure BiOCl-OV,and the conversion rate and selectivity reach 92%and 99%respectively.2.Au@Ag@Pd/Ti₃C₂T_x composite photocatalyst successfully synthesized and its catalytic performance for selective reduction of nitrobenzene.The synthetic Au@Ag@Pd was supported on Ti₃C₂T_x surface by APTES,and the composite catalyst youdaoplaceholder Au@Ag@Pd/Ti₃C₂T_xwas synthesized.HRTEM,XRD,XPS and other characterization methods showed that the catalyst was successfully prepared.The light absorption intensity of the composite catalyst is obviously increased,and the recombination efficiency of hot electrons and holes is reduced.In driving the reduction of nitrobenzene to aniline,the photocatalytic activity of Au@Ag@Pd/Ti₃C₂T_x is greatly improved compared with Au/Ti₃C₂T_x,Ag/Ti₃C₂T_x,Pd/Ti₃C₂T_x,Au@Ag/Ti₃C₂T_x and other catalysts supporting one or two precious metal particles.Both the conversion rate and the aniline yield were 100%.