Controllable Preparation Of Noble Metal-graphene And Their Catalytic Properties

With the continuous development of nanotechnology,single structure and performance of nano-materials has been unable to meet the scientific progress of the development,so the development of more excellent performance of nanocomposites is particularly important.Nanocomposites not only maintains the good performance of the original nano-materials,but also has some new physical and chemical properties.Noble metals as a catalyst is a substance which only alters chemical reaction rate but does not participate in the final product.It has potential applications in chemical industry,biocatalysis and environmental management.Recently,a new type of visible light Ag@AgX surface plasmon new photocatalyst has been extensively studied due to the absorption of visible light by noble metals.However,due to its low recovery rate and other reasons,further research and exploration to noble metals is significantly affected.Due to its excellent electrical?specific surface area up to 2675m2/g?and mechanical properties of Graphene,is expected to be an ideal carrier material for homogeneously dispersing the active components of various catalysts and has important practicality for the modification of noble metals value.Therefore,The main contents of this paper are summarized as follows:1.Ag@rGO layered nanocomposites was prepared from Ag NO₃/GO by a simple green process,in which glucose was used as a reducing agent to reduce Ag NO₃ to Ag and GO to rGO.Reduced graphene oxide as a good conductor can inhibit charge recombination,in which silver is introduced into the layer as non-carbon particles,and the interlayer distance of graphene will increase,weakening the van der Waals force between the layers,Thereby reducing the probability of agglomeration.At the same time,the layer structure of the composite material and the high specific surface area of rGO can significantly improve the reductive activity to p-nitrophenol,in which silver acts as a reducing agent.2.Ag@AgCl/rGO nanocomposites was synthesized from AgCl@GO by a photo-reduction method,in which ethylene glycol was used as a reducing agent to partly reduce AgCl to Ag toform Ag@AgCl heterostructure and to reduce GO to rGO.Simultaneously,The interface of Ag@AgCl with a plasma effect provides a platform for rapid transfer of photoexcited electrons.Furthermore,the successful loading of rGO increases the charge transfer rate and blocks its hole-electron recombination.The resulting Ag@AgCl/rGO nanocomposites have enhanced light adsorption ability and superior photoexcited separation of electron-hole pairs.The effect of Ag@AgCl morphology on photocatalytic activity is rarely studied,so in this article the amount of PVP concentrations and p H were modified to change the morphology and methylene orange?MO?was degradated to study the photocatalytic performance of the composites.The results indicated that the Ag@AgCl morphology affected the photocatalytic activity of the composite.