Study On The System And Properties Of 3D Nanometer ZnO Materials

As a special direct wide band gap semiconductor material,zinc oxide has a unique structure and good performance,and has a good application prospect in many fields.Because of the different properties of micro-and nano-structures with different morphology and size,it is a very meaningful work to control the synthesis of zinc oxide with different micro-and nano-structures and to study the properties related to its morphology and size.In this paper,through the synthesis of 3D flower-like,3D lamellar holes,rods,spheres and other different morphology of nano-zinc oxide,and observe their respective reaction systems,investigated the factors affecting the morphology,preliminary explored the reaction mechanism,studied the practical application effect of different morphology zinc oxide particles in photocatalysis.The main tasks of this study are as follows:1.The effects of different temperatures on the growth of flower-like nanostructured zinc oxide were investigated.Zinc acetate,sodium citrate and sodium hydroxide were used as raw materials.The hydrothermal method was used to prepare nano-Zn O with lamellar cross-shaped flower.The resulting samples were characterized by field emission scanning electron microscopy,X-ray diffraction analyzer and Zeta potential.Using Rhodamine B as a model molecule,UV-Vis spectroscopy was used to investigate the photocatalytic properties of the sample.The results show that there are obvious differences in the morphology of the products obtained at different temperatures.The nanomaterials have high photocatalytic activity and stability under ultraviolet-visible light,and the degradation rate of Rhodamine B solution can be brought close to 100%after irradiation for 2 hours.The Zeta potential of the sample is-13.2 e V,indicating that the sample may have structural defects and the nanoparticles have a large number of Zn²⁺vacancies or excess O^2-.2.Zinc nitrate hexahydrate,urea as raw material,ethanol,and secondary water as solvent,solvothermal method was used to prepare nanoporous zinc oxide.Field emission electron microscopy,X-ray diffraction analyzer and Zeta potentiometer were used to characterize the samples.Using Rhodamine B as a model molecule,UV-Vis spectroscopy was used to investigate the photocatalytic properties of the sample.The results of the study indicate that the porous nanoporous zinc oxide has been successfully prepared?it has not been reported before?and the growth mechanism of the product has been studied.The nanomaterial has high photocatalytic activity and stability under ultraviolet-visible light,and the degradation rate of Rhodamine B solution can be approached by 100%after irradiation for 2 hours.The Zeta potential of the sample is-15.43 e V.3.The photocatalytic effects of zinc oxide particles with various morphology,such as flower-like,lamellar holes,spheres,rods,etc.,as well as the practical application effects in coke wastewater were investigated.The X-ray diffraction analyzer was used for field emission scanning.Electron microscopy was used for characterization.The absorbance was measured and analyzed by UV-Vis spectrophotometer.It was found that the structure with the best catalytic effect in the coke wastewater was nanoporous zinc oxide,and the amount of coke was the quality of the wastewater.At 2%,the adsorption performance and catalytic effect were optimized and the time was 0.5 h.