Noble metal doped zno nanoparticles and their use as photocatalysts for the degradation of unsymmetrical dimethylhydrazine wastewater

Abstract

The invention relates to precious metal-doped ZnO nanoscale particles and a use thereof. The precious metal-doped ZnO nanoscale particles are ZnO / Ag and ZnO / Pd nanoscale particles which are prepared from zinc acetate, sodium hydroxide, silver nitrate and palladium chloride by an ethanol auxiliary hydrothermal method, wherein the diffraction peak of ZnO belongs to a hexagonal wurtzite structure; a space crystal group of ZnO belongs to P63mc(186); a point lattice constant a of ZnO is equal to a point lattice constant b of ZnO and is equal to 0.3249nm; a point lattice constant c of ZnO is equal to 0.5205nm; the diffraction peak of Ag is in accordance with a standard map JCPDF:87-0717; a space crystal group of Ag belongs to Fm-3m(225); a point lattice constant a of Ag is equal to a point lattice constant b of Ag, is equal to a point lattice constant c of Ag and is equal to 4.086nm; the diffraction peak of Pd is in accordance with a standard map JCPDF:88-2335; a space crystal group of Pd belongs to Fm-3m(225); and a point lattice constant a of Pd is equal to a point lattice constant b of Pd, is equal to a point lattice constant c of Pd and is equal to 3.900nm. The use of the precious metal-doped ZnO nanoscale particles comprises that the precious metal-doped ZnO nanoscale particles are utilized as a photocatalyst for unsymmetrical dimethylhydrazine wastewater degradation. Compared with the prior art, the precious metal-doped ZnO nanoscale particles have good morphology and a high degree of crystallization; a preparation method of the precious metal-doped ZnO nanoscale particles is simple and has good repeatability; a result of a test shows that the precious metal-doped ZnO nanoscale particles can be degraded faster and more thoroughly under sunlight; and the precious metal-doped ZnO nanoscale particles have a lower production cost, better energy-saving effects and a certain referential meaning for industrial application.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and relates to a precious metal-doped ZnO nano particle material and its application, in particular to using the material as a photocatalyst for photocatalytic degradation of unsymmetrical dimethylhydrazine wastewater under sunlight irradiation. Background technique [0002] Nano-ZnO is a composite of nano-materials and semiconductors, which has excellent photocatalytic properties. However, ZnO has a narrow spectral response range and can only utilize 5% of the ultraviolet light in sunlight. The use of noble metals to modify semiconductor photocatalysts can not only expand the spectral response range of ZnO, but also effectively capture excited electrons and improve its photocatalytic activity. The deposition of noble metals on the surface of semiconductors generally forms nano-scale atomic clusters. The deposited noble metals are in contact with the semiconductors, which is conduci...

AI Technical Summary

Problems solved by technology

[0003] In the prior art prior to the present invention, Zhou Yinbai, Xu Wenguo, Zhang Guangyou and others from Beijing Institute of Technology and other units published in "Journal of Beijing Institute of Technology" 2009 Volume 29 No. 3 "Neodymium-doped nano-zinc oxide catalytic degradation Research on unsymmetrical dimethylhydrazine" and Xu Wenguo, Jia Yan, and Sha Jing were published in the article "Copper and neodymium co-doped nano-TiO2 photocatalytic degradation of unsymmetrical dimethylhydrazine wastewater" in "Journal of Beijing Institute of Technology", Volume 30, Issue 8, 2010 , published a research report on the treatment technology of rare earth metal-doped nano-ZnO photocatalytic degradation of unsymmetrical dimethylhydrazine wastewater, which is an effective way for photocatalytic degradation of unsymmetrical dimethylhydrazine wastewater. However, in the disclosed technology, the preparation technology of ZnO is complicated and the degradation The amount of rare earth photocatalysts obtained from unsymmetrical dimethylhydrazine wastewater is large, and the cost is high. At the same time, ultraviolet light must be used as the photocatalytic light source, which consumes a lot of energy.

Images