Construction And Performance Study Of Precious Metal Au-based Photocatalytic Material

Plasma nanomaterials have attracted extensive attention in the field of photocatalysis because they can excite hot electrons,enhance local electric field and broaden the range of light response.Noble metal nanomaterials will produce surface plasmon resonance（SPR）effect under light irradiation.The application of noble metal nanomaterials in the rational design and construction of new plasma photocatalytic materials can effectively improve the photocatalytic performance of composite catalysts.Based on this,this paper takes precious metal modified semiconductor TiO₂ plasma photocatalyst and precious metal modified ZIF-67 plasma photocatalyst as the research objects,and studies their photocatalytic properties.The main research contents are as follows:1.Preparation of Au@Ag/TiO₂/Ti₃C₂ composite photocatalyst and its performance in driving nitrobenzene reduction reaction.Using 3-aminopropyl triethoxysilane（APTES）,the synthesized Au@Ag Nanoparticles were loaded on TiO₂ microspheres Au@Ag/TiO₂,then mxene was opened and intercalated to obtain Ti₃C₂ nano sheet and modified with it Au@Ag/TiO₂,final synthesis Au@Ag/TiO₂/Ti₃C₂ composite photocatalyst.The successful preparation of the catalyst was proved by HRTEM,XPS and XRD.The composite catalyst has excellent light absorption range,and the recombination rate of photogenerated carriers is significantly reduced after Ti₃C₂ modification.The reduction of nitrobenzene to aniline was used as the probe reaction Au@Ag/TiO₂/Ti₃C₂ showed significantly enhanced photocatalytic activity.At 0 ℃ and after 5 minutes of illumination,the conversion of nitrobenzene and the selectivity of aniline reached 100%,which was far better than that of aniline Au@Ag/TiO₂,Au/TiO₂ and Ag/TiO₂ catalysts.2.Preparation of Au/Co（OH）2 hollow structure composite photocatalyst and its performance for hydrogen production by aminoborane hydrolysis.ZIF-67 nanocubes were synthesized by coordination of cobalt nitrate and dimethyl imidazole.Au NPs were prepared by sodium citrate reduction method.Au nanoparticles were loaded on ZIF-67 nanocubes by APTES to obtain Au/Co（OH）2 hollow structure composite photocatalyst.The successful synthesis of the catalyst was confirmed by SEM,HRTEM,XPS and XRD.Under light conditions,Au/Co（OH）2-3 composite catalyst has good catalytic activity for hydrogen production from borane ammonia hydrolysis,the hydrogen production rate is 397.6 m L·min-1·g-1,and the catalyst has excellent stability.