Selective composite photo-catalyst powder and preparation method and application thereof

Abstract

The invention belongs to the technical field of photo-catalysts and composite adsorbing materials and in particular relates to selective composite photo-catalyst powder and a preparation method and application thereof. The chemical formula of the composite photo-catalyst powder is La2NiO4 / Y2Mo4O15. The preparation method comprises the following steps: weighing soluble salts of nickel and soluble salts of lanthanum according to a molar ratio of 1 to 2, dissolving the salts in distilled water, thereby obtaining a solution A; slowly adding a sodium hydroxide solution, stirring, performing suction filtration on the solution, thereby obtaining a precipitate B; calcining and maintaining the temperature in a muffle furnace, thereby obtaining catalyst powder C; adding the powder C into an alcoholic solution, performing ball milling at high speed, thereby obtaining powder D (La2NiO4); weighing a proper amount of soluble salts of yttrium, measuring a certain amount of ammonium molybdate, dissolving in a proper amount of distilled water, thereby obtaining a solution E; and mixing the solution E and the powder D, drying, calcining, thereby obtaining the composite catalyst powder. The composite photo-catalyst powder can be used in degradation treatment of insoluble organic matters in industrial wastewater and particularly has an obvious catalytic degradation effect on methylene blue.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts and composite adsorption materials, and in particular relates to a selective composite photocatalyst powder and its preparation method and application. Background technique [0002] Photocatalytic reaction refers to the catalysis of a certain reaction under the condition of natural light. Photocatalysis is the use of known light sources that exist in nature to irradiate a certain catalyst. After a series of changes such as electronic transitions, the light energy in nature is converted into the chemical energy required for chemical reactions, thereby producing catalysis. [0003] Lanthanum nickelate is a functional material with broad application prospects, and is usually prepared by coprecipitation and reduction methods. Co-precipitation method, the metal salt solution containing different components is mixed and dissolved, and then supplemented with an appropriate precipitant, fully diss...

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Problems solved by technology

Co-precipitation method, the metal salt solution containing different components is mixed and dissolved, and then supplemented with an appropriate precipitant, fully dissolved and then mixed to form a precipitate to form a suspension; after stirring, suction filtration is performed to obtain a filter cake. ; When the precipitant is added in the co-precipitation method, the local concentration may be much higher than other parts, and it is easy to agglomerate and make the composition uneven

Reduction method, dissolving and mixing several metal salts of different components, adding a certain amount of complexing agent, and then adding an appropriate amount of water; heating in a water bath under certain conditions, and when the amount of the solution is reduced to a certain level, put it in a dry After fully drying, a colloid-like substance is obtained, and then sintered in a furnace with a non-oxidizing atmosphere (such as an ammonia furnace, nitrogen furnace, etc.), and finally obtains a related powder; the reduction method must be guaranteed during the sintering process The reducing gas is always unblocked, and the reaction process must be tracked, which is time-consuming and laborious; it is accompanied by a long sintering cycle and a slow cooling rate. The reducing gas is generally a polluting gas, causing environmental pollution

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