Preparation Of Zinc Oxide Nano-composites And Photocatalytic Activity On Methylene Blue

With the increasing of water pollution problems,photocatalysis technology is becoming a promising technology for degrading pollutants.Finding the catalyst that can effectively catalyze the specific reaction is imperative to increase the energy conversion rate of photocatalysis.Therefore,the development of efficient photocatalysts is of great significance to solve the environmental and energy problems.These has carried out the following research:1.Nano-zinc oxide?Zinc Oxide,ZnO?with different morphologies was synthesized by hydrothermal method.Phase structure analysis showed that the prepared samples was pure nano-ZnO with good crystallinity.The morphology of nano-ZnO was found to be granular or rod-like.When the reaction temperature was 200?and the reaction time was 12 h,granular nano-ZnO with a degradation efficiency of 90.1%was obtained.When the reaction ultrasonic time was 60 min,the reaction temperature was 120?,and the reaction time was 24 h,a rod-shaped nano ZnO with a degradation efficiency of 91.2%was obtained.2.Nano-ZnO/ZnS composites were prepared by hydrothermal method.The prepared composites were nano-ZnO/ZnS by phase structure analysis.The microstructure of ZnO/ZnS composites was obtained by microstructure analysis.ZnO was a granular structure with rod-shaped ZnS crystals.When the reaction temperature was 200?,the reaction time was12 h,and the scale was 20:2,a nano-ZnO/ZnS composite with a photodegradation rate of95.9%was obtained.3.Nano-ZnO/MoS₂ material was prepared by hydrothermal method.The composite was determined to be ZnO/MoS₂ by phase structure analysis.The microstructure of the composite was found to be combined with the flower-like MoS₂.The nanocomposite with a photodegradation rate of 92.5%was obtained at the temperature of 140?,the reaction time was 9 h,and the scale was 20:3.4.Nano-ZnO/RGO composites were prepared by sol-gel method.The effects of different concentrations of RGO on the composites were investigated.Through phase structure analysis,a small RGO diffraction peak appeared in the composite with directional growth and high crystallinity around 26.5°,which confirmed the existence of RGO in the composite.Through the phase structure analysis,the two-dimensional structure of RGO in nano-RGO/ZnO composites can provide a good carrier for the growth of ZnO nanorods.Compared with pure ZnO,the UV photocatalytic degradation rate of methylene blue was significantly improved,and the degradation rate was 96.6%.