Photocatalyst with function of releasing negative oxygen ions, and preparation method and application thereof

Abstract

The invention discloses a photocatalyst with a function of releasing negative oxygen ions, and a preparation method and application thereof. The photocatalyst comprises a honeycomb ceramic carrier containing first rare earth metal, a modifier and a photocatalytic active component, the modifier and the active component are sequentially loaded on the honeycomb ceramic carrier, and the modifier is aluminum oxide-titanium dioxide. The catalyst is especially suitable for photocatalytic reaction under the action of ultraviolet light, has good activity and stability, and can release negative oxygen ions to further improve the air quality.

Description

technical field [0001] The invention relates to a photocatalyst capable of releasing negative oxygen ions and a preparation method thereof, belonging to the field of photocatalytic materials. Background technique [0002] Semiconductor photocatalytic oxidation, as a new technology that can decompose organic matter into carbon dioxide and water under normal temperature and pressure without causing secondary pollution, has attracted great attention from researchers all over the world. Studies have found that the use of semiconductor photocatalysis can effectively degrade various organic pollutants in water and air, such as halogenated hydrocarbons, nitroaromatics, phenols, organic pigments, pesticides, surfactants, etc.; , nitrite, thiocyanate, etc. into non-toxic or low-toxic compounds; can also be used in antibacterial, deodorizing, air purification, self-cleaning materials and other fields. The semiconductor photocatalysts that have been studied so far mainly include metal...

AI Technical Summary

Problems solved by technology

[0003] Titanium dioxide photocatalysts are usually used in powder form, but this will form a suspension system in the fluid, which will cause technical problems such as separation difficulties and difficult recovery, thus limiting the practical application

[0004] At present, the technical problems of supported photocatalysts are: first, when non-catalytic materials such as binders are used, the amount of titanium dioxide on the surface will be affected during the loading and sintering process, thereby affecting the catalytic activity; When titanium dioxide is loaded on a carrier such as titanium dioxide, high-temperature calcination is usually used to increase the firmness of titanium dioxide loading, but titanium dioxide is easily sintered, and a non-photocatalytically active crystal phase is formed, thereby affecting catalytic activity, and even high-temperature calcination still exists. The problem of loss, which affects the activity and stability of the catalyst; third, when ceramics and other carriers support titanium dioxide, it is also prone to uneven distribution, which further affects its catalytic activity and stability.

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