Bismuth iron niobium-based composite magnetic particle photocatalyst with core-shell structure, preparation and application of bismuth iron niobium-based composite magnetic particle photocatalyst

Abstract

The invention discloses a catalytic material with a core-shell structure, gamma-Fe2O3-Fe3-xBixNbO7 (x is not less than 0.5 but not more than 1), SiO2-Fe3-xBixNbO7 (x is not less than 0.5 but not more than 1), MnO-Fe3-xBixNbO7 (x is not less than 0.5 but not more than 1); the particle size of gamma-Fe2O3, SiO2 and MnO is 0.06 to 2 microns, the particle size of core-coated Fe3-xBixNbO7 (x is not less than 0.5 but not more than 1) is 0.08 to 1.2 microns; the application of the catalytic material with the core-shell structure includes that: a reaction system consisting of a magnetic field device and photocatalytic material with a core-shell structure is used for degrading pentachlorophenol, Atrazine, diuron, crystal violet and other organic pollutants in water, and the magnetic-field intensity is chosen to be from 0.5 to 5T, and a xenom lamp or a high voltage mercury lamp is used as a light source; the volume percents of the three magnetic composite photocatalytic materials are all 1/3 of volume ratio so that the magnetic composite photocatalytic materials can be distributed in aqueous solution uniformly, and oxygenation and aeration are simultaneously adopted; the entire photoreaction is implemented under airtight and light-tight environment. Novel catalyst is loaded on a magnetic particle core through a multi-target magnetron sputtering deposition method, a pulse laser sputtering deposition method or a metal organic substance chemical vapor deposition method.

Description

technical field [0001] The present invention relates to a novel photocatalyst, preparation and application, especially powder catalytic material Fe 3-x Bi x NbO 7 (0.5≤x≤1) and γ-Fe with "magnetic particle core-photocatalyst shell" structure 2 o 3 -Fe 3-x Bi x NbO 7 (0.5≤x≤1) (photocatalyst shell), SiO 2 -Fe 3-x Bi x NbO 7 (0.5≤x≤1), MnO-Fe 3-x Bi x NbO 7 (0.5≤x≤1), the preparation process, the application of photocatalytic removal of organic pollutants in water, and the application of photocatalytic decomposition of water to produce hydrogen. Background technique [0002] In the water environment, the treatment of organic pollutants that are difficult to biodegrade has always been a difficult and hot topic in the field of water treatment. Organic pollutants that are difficult to biodegrade are extremely harmful to human health and have a huge destructive effect on the ecological environment. Therefore, excellent technologies and processes should be found to re...

AI Technical Summary

Problems solved by technology

However, the above-mentioned photocatalytic technology and semiconductor powder catalytic materials have not yet been industrialized in terms of removing organic pollutants in water bodies and decomposing water to produce hydrogen. Post-processing problems, if the photocatalyst is fixed on glass and other materials can solve the problem of photocatalyst separation and recovery, but its photocatalytic efficiency is significantly lower than that of the suspension system; (2) Titanium dioxide can only absorb ultraviolet light and has no response in the visible light range , the utilization rate of sunlight is low (4%), and the ultraviolet light in the solar spectrum only accounts for less than 5%, while the visible light with a wavelength of 400-750nm accounts for 43% of the solar spectrum. When the ultraviolet and visible light bands are fully utilized at the same time, the photon quantum efficiency will be greatly improved

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