Photocatalytic Performance Of Au-supported ZnO Nanomaterials

Since ancient times,energy has been the key to the survival of mankind.Among them,the accumulation of fossil fuels through photosynthesis has enabled humans to continue their lives.With the evolution of time,human beings have more and more ways to obtain energy.Material has become the biggest threat to human living environment.Therefore,photocatalytic technology has been widely used as a technology that conforms to the concept of environmental protection.Photocatalytic technology can achieve the purpose of purification and cleaning through light,and it can make the damaged nature well repaired.This paper mainly studies the photocatalytic performance of nano-ZnO and Au-ZnO nanocomposites,and looks for the system composition that responds to the best catalytic performance.ZnO is non-toxic and has some potentially superior properties,which can convert light energy into other forms of energy,such as chemical energy and electrical energy.ZnO has a large band gap.Using this feature,some precious metals can be loaded on its surface.The resulting new composite material will have new properties.After ZnO is excited by light,it will generate electron-hole pairs.Reacts with substances to generate groups with high redox capacity,such as superoxide ion radicals,hydroxyl radicals,etc.,which further degrades pollutants.In this paper,the Au/ZnO nanocomposite photocatalyst with noble metal Au was prepared by hydrothermal method under normal temperature and pressure.The photocatalytic performance of the sample was experimentally studied.Firstly,we used XRD,SEM,TEM,UV-Vis and other methods to characterize the samples,and the results showed that the prepared samples have high purity and the carrier ZnO has a hexagonal wurtzite structure.Secondly,tests of photocatalytic degradation of methylene blue solution found that the catalytic effect was best when the Au loading rate was 3%;the test results of the capture experiments showed that the hydroxide ions play a major role in the photocatalytic process.The hydroxide ion is highly oxidizing,it can oxidize the organic matter in the solution into carbon dioxide(CO2)and water(H2O)and other inorganic small molecules,so that the solution can be degraded.Finally,the performance of the samples in this article was tested in other aspects,such as saturable absorption performance,photocurrent stability,and impedance.