Preparation Of Noble Metallic ?Au/Pd?Heterojunction/Silica ?SiO₂? Yolk Shell Nanostructure And Their Photocatalytic-enhanced

Plasmonic bimetallic nanostructure has attracted considerable attention as a promising catalyst which can absorb visible light for light-driven catalytic reactions.The stability and recovery of the catalysts are still key issues for sustainable development of the green chemistry.In this work,we designed and implemented an Au/Pd heterojunction@mesoporous SiO₂ yolk-shell nanoparticles?Au/Pd@m-SiO₂ yolk-shell NPs?for plasmon-enhanced photocatalysis.Au NPs can absorb visible light,Pd nanoparticles as a important noble catalytisis which can enhance the reaction activities.On the one hand,the heterojunction of Au/Pd enhances the separation of hot electrons which be produced on the Au NPs surface and holes under visible light irradiation,and on the other hand,the synergistic cffect of bimetallic also enhanced the reaction activities.Mesoporous Si O₂ shell as a nanoreaction which can protects the active Au/Pd NPs from aggregation.In the reduction reaction of p-nitrophenol?4-NP?,the reaction rate under visible light is faster than the rate under dark,and in the dark,the plasmonenhanced is more obvious.The Au/Pd@m-SiO₂ yolk-shell NPs exhibit extremely high stability for the plasmon-enhanced catalytic reduction of p-nitrophenol?4-NP?under visible light irradiation.The merging of plasmonic material and yolk-shell nanostructure proposes a new way for designing of catalysts with good stability and promising activity.