Preparation method of doped nanometer zinc oxide and application of doped nanometer zinc oxide in photocatalysis

Abstract

The invention discloses a preparation method of doped nanometer zinc oxide and an application of doped nanometer zinc oxide in photocatalysis. The preparation method comprises the following steps: polyvinyl alcohol, zinc nitrate hexahydrate and aluminum nitrate nonahydrate or cerium nitrate hexahydrate or lanthanum nitrate hexahydrate are taken as raw materials, a homogeneous aqueous solution is prepared from the raw materials and subjected to vacuum freeze drying and calcination, and aluminum, cerium or lanthanum doped nanometer zinc oxide powder is obtained. The flow of the preparation process is simple, one-step uniform mixing is performed in a doping process, the raw materials are easily available, and the preparation process is clean and pollution-free; the prepared aluminum doped nanometer zinc oxide powder is agglomeration-free, has photocatalytic activity better than that of pure nanometer zinc oxide when used for degrading reactive brilliant blue KN-R under ultraviolet light, while rare-earth metal cerium doped nanometer zinc oxide can degrade organic dyes by using visible light and has good application prospect in organic dye wastewater treatment.

Description

technical field [0001] The invention belongs to the field of photocatalysis and preparation of inorganic nanometer materials, in particular to a preparation method of zinc oxide nanopowder doped with metals and rare earth metals and an application of photocatalytic degradation of organic matter. Background technique [0002] Heterogeneous photocatalytic oxidation is a promising technology for treating polluted wastewater. Most toxic pollutants can be photocatalytically degraded into nontoxic compounds by semiconductor materials. As the most environmentally friendly advanced treatment technology for environmental pollutants, nano-semiconductor photocatalytic oxidation technology has the advantages of low technical energy consumption, complete mineralization of pollutants, simple operation, wide application range, mild reaction conditions, and less likely to cause secondary pollution. The use of photocatalysts to completely harmless the refractory and toxic organic pollutants ...

AI Technical Summary

Problems solved by technology

Each method has its advantages and disadvantages. The precipitation method is simple and low in cost, and the prepared particles are easy to agglomerate; the hydrothermal method requires an autoclave and requires high operating requirements, but the product morphology can be adjusted through the reaction conditions; the microemulsion method requires organic solvents and Surfactants have the problem of secondary pollution. This method synthesizes nanoparticles with uniform distribution; the sol-gel method is easy to carry out, and the reactants are likely to be uniformly mixed at the molecular level, but the cost of raw materials is expensive and the production time is high. Long, there are a lot of micropores in the gel, and the drying process will be affected; the advantage of the template method lies in the control of the size, shape and structure distribution of the material, and there are certain requirements for the selection of the template

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