Preparation Of Hierarchical ZnO Structure And Its Photocatalytic Performance

Semiconductor zinc oxide(Zn O)materials have been widely used in the degradation of organic pollutants due to their high catalytic activity and stability.However,Zn O still has many problems such as wide band gap,easy electron-hole recombination,photo-corrosion and easy aggregation.Some modification methods such as morphology control,ion doping,and noble metal combining were performed to to improve the photocatalytic activity.In this paper,Cu-based Zn O hierarchical structured films were prepared by electrodeposition-hydrothermal two-step method.Ce/Zn O structured microspheres doped with Ce doped rare earth metals were prepared by coprecipitation..Ag/Zn O composite nanomaterials were prepared by simple hydrothermal-calcining method.The samples were characterized by scanning electron microscope(SEM),X-ray diffraction instrument(XRD),UV-Vis-DRS.The photocatalytic properties of methyl orange and rhodamine B(Rh B)were evaluated.The main conclusions are as follows:1.Hierarchical Zn O structure was grown on copper foil by hydrothermal method.The addition of trace metal ions plays a key role in controlling the crystallization kinetics and the final morphology of graded micro-nano structures.Because Zn O hierarchical structures with different morphology have different porous structures,specific surface area and crystalline properties,Zn O hierarchical structures with different morphology have different photocatalytic activities under ultraviolet light.2.The different amounts of Ce doped products are all nano-structured microspheres formed by Zn O micronanoparticles interleaving each other.Ce doping can improve the ultraviolet photocatalytic activity of Zn O structured microspheres.When the doping amount is 1.5%,the Ce/Zn O nanospheres have the highest photocatalytic activity,and have been reused for 4 times.3.Silver compound amount,reaction temperature,reaction time,the amount of PEG-400,all will affect the photocatalytic activity of Ag/Zn O composite nanomaterials,reaction temperature 85 ?,reaction time 2 h,PEG-400 15 m L,silver salt,zinc salt amount of substance ratio 0.3:1 preparation of Ag/Zn O photocatalytic activity is best,visible light 300 min,The degradation rate of Rh B solution reached 77.27%...