AIN-doped modified visible-light activity photocatalyst preparation method

Abstract

The invention discloses an AIN-doped modified visible-light activity photocatalyst preparation method. The method comprises the following steps: taking a nano TiO2 colloidal solution with a certain of solid content, using water for dilution to obtain a nano TiO2 dilute solution according to a certain proportion to obtain a photocatalyst solution; adding AIN in the photocatalyst solution according to a certain proportion, stirring the materials for a while to obtain the AIN-doped modified photocatalyst; wherein the solid content of the nano TiO2 colloidal solution is 10-30 wt%, the solid content of the nano TiO2 dilute solution is 0.1-1.0 wt%, AIN is nano aluminium nitride, the average particle size is 30-60 nm, and the AlN addition is 0.01-0.1wt%. The photocatalyst has the advantages of realization of visible light band response, good dispersibility, high photocatalysis efficiency, and more excellent modification effect.

Description

technical field [0001] The invention relates to the technical field of air purification, in particular to a preparation method of an AlN doped modified visible light active photocatalyst. Background technique [0002] Photocatalyst is a general term for a photo-semiconductor material with photocatalytic function represented by nano-scale titanium dioxide. It is coated on the surface of the substrate, and under the action of ultraviolet light, it produces a strong catalytic degradation function: it can effectively degrade toxic substances in the air. Harmful gas; can effectively kill a variety of bacteria, and can decompose and harmlessly treat the toxins released by bacteria or fungi; it also has functions such as deodorization, anti-pollution, and air purification. It can be known from the mechanism of photocatalyst that only under the irradiation of ultraviolet light with a wavelength lower than 387.5nm, the photocatalyst can be excited to generate photogenerated electron-...

AI Technical Summary

Problems solved by technology

It can be known from the mechanism of photocatalyst that only under the irradiation of ultraviolet light with a wavelength lower than 387.5nm, the photocatalyst can be excited to generate photogenerated electron-hole pairs, degrade the organic pollutants in the indoor and car air, and achieve the effect of purifying the air. Ultraviolet light of this wavelength only accounts for 3-5% of sunlight, and the utilization rate of sunlight is very low, thus greatly reducing the scope of use of photocatalysts

In order to make better use of sunlight to stimulate photocatalysts to degrade organic pollutants and expand the photocatalyst’s photoresponse absorption wavelength range, it is necessary to modify photocatalysts. In the existing photocatalyst doping modification methods, there are mainly metal ion doping, Non-metal ion doping, noble metal deposition, surface photosensitization, etc., are basically modified by a single doping method, the effect of photocatalyst modification is not significant, and some methods still have problems such as unstable performance and expensive modification.

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