Fabrication Of Semiconductive Nanotube/Nanorod Arrays And Their Photocatalytic Properties

Water is the foundation of life.However,due to the rapid development of technology,over-expansion of population,water resources have suffered unprecedented severe pollution.In recent years,photocatalytic degradation of pollutants in water have demonstrated its bright prospects for solving water pollution.Zinc Oxide?ZnO?and Titanium Dioxide?TiO₂?are excellent wide bandgap semiconductor materials and can be widely used in electroluminescence,surface acoustic wave devices,pressure sensitive devices,solar cells,and pollutant treatment.However,their practical application is limited by their low quantum efficiency,low utilization of sunlight,ease of electron-hole recombination,and their difficulty in recycling catalysts.To solve this problem,zinc oxide and titanium dioxide were prepared into ordered nanorod/tube arrays using template-assisted electrodeposition and anodic oxidation methods.To develop efficient and recyclable zinc oxide and titanium dioxide based photocatalysts,composites of silver and zinc oxide,molybdenum disulfide and titanium dioxide were produced by electrodeposition.ZnO nanorod arrays with a diameter of 800 nm and length of 900 ?m were prepared on Indium Tin Oxide?ITO?electrode using a template-assisted electrochemical deposition method.Many characterization methods were used to study the physical and chemical properties of ZnO nanorods.Through the electrodeposition method,silver was doped into ZnO to produce Ag-ZnO nanorod arrays with different silver contents.Silver can increase the efficiency of the use of sunlight,inhibit the recombination of electron-hole pairs,and promote the photocatalytic degradation efficiency.The photocatalytic degradation of Congo Red was carried out under a 350 W xenon lamp.The photocatalytic degradation performance of Ag-ZnO NRA was the best with the degradation rate of 91.9% in 120 min,and good recycle ability.TiO₂ Nanotube Arrays with diameters of 80-100 nm and length of about 5.7 ?m was prepared by anodizing method using metal Ti plates as raw materials.The amount of molybdenum disulfide on TiO₂ was controlled by electrodeposition time.Molybdenum disulfide-loaded titania nanotube arrays?MoS₂@TiO₂ Nanotube Arrays,MoS₂@TiO₂ NTA?were successfully prepared.They were characterized by many characterization methods.Molybdenum disulfide can improve the utilization of visible light in sunlight.The photocatalytic performance of Congo Red was carried out under a 350 W Xe lamp.The results of photocatalytic degradation showed that the MoS₂@TiO₂ NTA electrodeposited for 20 min had the best photocatalytic degradation efficiency.