Preparation Of ZnO Micron Flowers And Bi₂O₃Semiconductor And Their Photocatalytic Properties

The semiconductor photocatalytic phenomenon is a hot research area developedsince1972. The photocatalyst under the irradiation of the excitation light source todegradation of organic pollutants, make it the mineralization of inorganic smallmolecule substances. Photocatalysts is security, stability, reusability, and has thepotential for development and utilization of solar energy, making the semiconductorphotocatalytic technology to become one of the key research directions to improve theenvironmental pollution. Semiconductor photocatalyst has been developed mainly inn-type semiconductor. ZnO semiconductor is the study of the more mature catalyst.Because harmless to the environment due to the low-cost, high efficiency to deal withpollution, and can be recycled repeatedly used, ZnO is a broad application prospects ofthe photocatalyst.However, as a wide band gap semiconductor, zinc oxide need to expand theabsorption of the excitation light source pop range, the response to visible light, iscommitted to the development and utilization of solar energy. In recent years, theperformance of photocatalytic properties of the three-dimensional zinc oxide, causingconcern to us. This work focuses on the Hydrothermal Synthesis with high catalyticactivity for three-dimensional zinc oxide at the same time, the development ofsemiconductor photocatalysts responding to visible is our one of the priorities. The maincontent is as follows:1. Hierarchical ZnO flowers were synthesized via a sucrose-assisted ureahydrothermal method. The thermogravimetric analysis/differential thermal analysis（TGA–DTA） and Fourier transform infrared spectra （FTIR） showed that sucrose actedas a complexing agent in the synthesis process and assisted combustion duringannealing. Photocatalytic activity was evaluated using the degradation of organic dyemethyl orange. The sucrose added ZnO flowers showed improved activity, which wasmainly attributed to the better crystallinity as confirmed by XPS and XRD analysis.2. Our work is the use of hydrothermal and chemical precipitation method byadding surfactant synthesis PEG8000of-Bi₂O₃elemental. The samples werecharacterized by XRD, SEM and other means.in the visible light degradation of methyl orange photocatalytic activity of the samples assessed. The experimental results provedonce again that the crystalline quality of semiconductor photocatalytic performanceclosely.3. We have chosen the photocatalytic activity of samples for further rare earth（cerium nitrate） doping experiments to improve the catalytic activity. Samplessynthesized by the Ce-doped bismuth oxide and CeO₂-Bi₂O₃composite of two parts.The photocatalytic activity of Ce-doped Bi₂O₃samples significantly improve the bestsynthesis of the Bi: Ce=1:0.05samples.