Core-shell gadolinium indium antimony base composite magnetic-particle photochemical catalyst as well as preparation and application thereof

Abstract

The invention relates to core-shell catalytic materials, namely, Gamma-Fe2O3-Gd3-xInxSbO7 (0.5<=x<=1), SiO2-Gd3-xInxSbO7 (0.5<=x<=1), and MnO-Gd3-xInxSbO7 (0.5<=x<=1); the grain sizes of Gamma-Fe2O3, SiO2 and MnO are 0.06-2Mum, the grain size of the Gd3-xInxSbO7 (0.5<=x<=1) after being wrapped with a shell is 0.08-1.2Mum. The invention also relates to an application of the core-shell catalytic materials, and the application is as follows: a reaction system composed of a magnetic field device and the core-shell photochemical catalyst material is utilized to degrade organic pollutants such as chlorophenasic acid, atrazine, diuron, crystal violet and the like in waste water, the magnetic filed device is a strength adjustable alternating magnetic field generator, the magnetic field intensity is 0.5-5T, and a light source is an xenon lamp or a high pressure mercury lamp; the percents by volume of the three magnetic composite photochemical catalytic materials are all one third, the three magnetic composite photochemical catalytic materials are uniformly distributed in an aqueous solution, an edge filter (Lambda is 420nm) is adopted, and oxygenation and aeration are adopted simultaneously; and the whole illumination reaction is carried out in an airtight and light-proof environment. A novel catalyst is loaded on the magnetic particles by adopting a multitarget magnetic control sputtering deposition method, a pulse laser sputtering deposition method or a metal organic chemical vapour deposition method. Gd3-xInxSbO7 powder (0.5<=x<=1) is taken as a catalyst, or the three magnetic composite photochemical catalytic materials are respectively loaded with Pt, NiO and RuO2 to be taken as auxiliary catalysts, the light source is the xenon lamp or the high pressure mercury lamp, and water is decomposed in an illumination reactor in an airtight glass pipeline controlled by a plurality of valves to produce hydrogen.

Description

technical field [0001] The present invention relates to a novel photocatalyst, preparation and application, especially the powder catalytic material Gd 3-x In x SbO 7 (0.5≤x≤1) and γ-Fe with "magnetic particle core-photocatalyst shell" structure 2 O 3 -Gd 3-x In x SbO 7 (0.5≤x≤1) (photocatalyst shell), SiO 2 -Gd 3-x In x SbO 7 (0.5≤x≤1), MnO-Gd 3-x In x SbO 7 (0.5≤x≤1), preparation process, application of photocatalytic removal of organic pollutants in water, and application of photocatalytic water splitting 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 have great harm to human health and have a huge destructive effect on the ecological environment. Therefore, excellent technologies and processes should be found to remove such pollutants ...

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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