A kind of selective composite photocatalyst powder and its preparation method and application

Abstract

The invention belongs to the technical field of photocatalysts and composite adsorption materials, and in particular relates to a novel selective composite photocatalyst powder and its preparation method and application. The chemical formula of the composite photocatalyst powder is: La2NiO4 / Y2Mo4O15. The preparation method is as follows: Weigh the soluble salt of nickel and the soluble salt of lanthanum according to the molar ratio of 1:2, dissolve them in distilled water to obtain solution A; slowly add sodium hydroxide solution, and after stirring, filter the solution with suction to obtain precipitate B ; calcined and kept warm in a muffle furnace to obtain catalyst powder C; put powder C into alcohol solution, high-speed ball milling, and dry to obtain powder D (La2NiO4); Weigh an appropriate amount of soluble salt of yttrium, measure A certain amount of ammonium molybdate is dissolved in an appropriate amount of distilled water to obtain a solution E; the solution E is mixed with the powder D, dried and calcined to obtain a composite catalyst powder. It can be used in the degradation treatment of insoluble organic matter in industrial wastewater, especially for the catalytic degradation of methylene blue.

Description

Technical field [0001] The invention belongs to the technical field of photocatalysts and composite adsorption materials, and particularly relates to a selective composite photocatalyst powder and a preparation method and application thereof. Background technique [0002] Photocatalytic reaction means to catalyze the occurrence of a certain reaction under the conditions of natural light. Photocatalysis uses a known light source in nature to irradiate a certain catalyst. After a series of changes such as electronic transitions, the light energy in nature is converted into chemical energy required for chemical reactions to produce catalysis. [0003] Lanthanum nickelate is a kind of functional material with wide application prospects. It is usually prepared by co-precipitation and reduction methods. Co-precipitation method, mixing and dissolving metal salt solutions containing different components, supplemented with appropriate precipitating agents, fully dissolved and then mixed to...

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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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