Preparation Of Gold And Zinc,Copper Oxides Nanocomposite And Its Photocatalytic Performance Study

Recently semiconductor composite photocatalyst has been prominent in photocatalytic field for its green and efficient advantage.For the purpose of improving the visible light photocatalytic ability of semiconductor,this paper chose the composites composed of gold and zinc,copper oxides semiconductor as the research object.Gold was combined with wide-gaped zinc oxide and narrow-gaped copper oxide to figure out the influence that gold caused to semiconductor with different bandgap;Composites with different structures were prepared with gold and copper oxide to figure out the influence that gold caused to semiconductor with different structure.The Au-ZnO composite catalyst has been prepared rapidly by drastic calcination,by adjusting the amount of HAuCl4,4H2O in precursor can control the load amount of gold.There are many holes and prominences on the surface of the samples,based on this the specific surface area of the sample has been increased enormously.Photocatalytic test showed that the load amount of gold has a best scope.By the method of authigenic acid etching,Cu2O was chosen as core Au was chose as shell to prepare composite catalyst.By adjusting the amount of HAuCl4-4H2O in precursor not only can control the load amount of gold but also can control etching degree of the sample.The experiment showed that authigenic acid etching method can be applied to Cu2O of various morphology.Photocatalytic tests find that Cu2O@Au hollow core-shell structure has the best photocatalytic property;The Au@Cu2O core-shell structure was prepared with Au triangle core.By adjusting the quantity of gold nuclear,the particle size of Au@Cu2O can be controlled,with the particle size increasing,the absorption resonance peak presents the trend of redshift.Photocatalytic tests showed that Au@Cu2O-8 has the best photocatalytic performance,during the photocatalytic process h+ play a main role.The experimental results showed that gold has more obvious improvement on copper oxide which is semiconductor with narrow bandgap;Gold can play a bigger role in plasma resonance effect when it is shell of the core@shell structure.