Preparation And Performance Study Of ZnTe And ZnSe Nanomaterial

Zinc telluride(ZnTe)and zinc selenide(ZnSe)as a semiconductor photocatalyst have a great prospect in the field of clean energy.Due to its wide bandgap width,low UV utilization and fast electron/hole coincidence rate,its application in photocatalysis has been greatly limited.Many researchers through a variety of effective means to solve this series of problems,such as: composite,doping,surface modification,are effective to overcome the above defects,while greatly improving the product of photocatalytic activity.In this paper,ZnTe and ZnSe nanomaterials with different catalytic properties were prepared by simple and effective solvothermal method and a series of performance tests were carried out.The main contents are as follows:1.ZnO / ZnTe / Te nanocomposites were successfully synthesized by simple solvothermal method using ZnO as Zn source.By changing the concentration of diethylenetetramine(DETA),the nucleation and self-assembly of DETA can effectively control the morphology of the product and play an important role in the photocatalytic activity of the product.The results show that DETA plays an important role in controlling product morphology and photocatalytic activity.In addition,the dual effects of N2H4 ligands in this system include:(1)intermolecular molecules acting as nanorods,and(2)acting as a molecular template to guide the product morphology.Under the synergistic effect of ZnO and ZnTe nanomaterials,the nanocomposites have strong UV-visible ability and low electron / hole recombination rate.ZnO / ZnTe / Te nanocomposites exhibit strong UV-visible light-driven photocatalytic activity.50 mg catalyst degradation of 50 ml methylene blue(10 mg / L)up to 99.8% under 300 W mercury lamp irradiation 2 hour.2.By the solvent heat method,zinc acetate and sodium selenite were used as zinc source and selenium source,sodium hydroxide as reducing agent,ethylenediaminetetraacetic acid(EDTA)as chelating agent,water as the solution prepared by the two phases(cubic phase and hexagonal phase)coexistence of ZnSe nanoparticles showed high photocatalytic performance,20 mg catalyst degradation of 40 ml methylene orange(40 mg / L)up to 84.4% under 350 W xenon lamp irradiation 1 hour.3.ZnO nanorods were prepared by hydrothermal method.Then,ZnO nanorods were used as precursors,and CuO / ZnO nanocomposites were prepared by chemical precipitation method by adding a certain amount of copper acetate.Through a series of characterization methods,CuO and ZnO have high photocatalytic activity,and the degradation of 15 mg / L methylene blue is 99.7% at 300 W mercury lamp irradiation for 2 hours.