Preparation method and application of silver/silver halide-loaded mesoporous titanium dioxide microsphere

Abstract

The invention provides a preparation method of a silver / silver halide-loaded mesoporous titanium dioxide microsphere. The preparation method comprises the following steps: mixing a proper amount of tetrabutyl titanate and diethylene glycol, and carrying out stirring at 25 DEG C for 8 hours; dropwise adding a mixture obtained in the previous step into acetone and continuing stirring to obtain a white precipitate; heating the collected white precipitate at 550 DEG C for 8 hours to obtain anatase titanium dioxide microspheres; weighing a proper amount of the titanium dioxide microspheres, dispersing the titanium dioxide microspheres in 20 mL of pure water, carrying out stirring for 1 h, dropwise adding a proper amount of hexadecyl trimethyl ammonium halide, and continuing stirring for 1 h; adding a silver nitrate solution, and continuing stirring for 1-2 hours; after illuminating for 30 minutes, centrifugally collecting a precipitate, and cleaning the precipitate with pure water to obtaina sample; and drying the sample at 60 DEG C, and then heating the sample for 8 hours in a nitrogen atmosphere at 300 DEG C to obtain the silver / silver halide-loaded mesoporous titanium dioxide microsphere. The titanium dioxide microsphere prepared by the method can be used as an effective visible-light-induced photocatalyst for catalytically decomposing formaldehyde.

Description

technical field [0001] The invention relates to a preparation method of a photocatalyst for decomposing formaldehyde, in particular to a preparation method and application of silver / silver halide-loaded mesoporous titanium dioxide microspheres for visible light catalytic decomposition of formaldehyde. Background technique [0002] Formaldehyde is a colorless, odorless, irritating gas that is very harmful to the human body. At present, the catalytic decomposition of formaldehyde is a common and efficient method for removing formaldehyde. As a photocatalyst that can catalyze the decomposition of formaldehyde, titanium dioxide is often used to remove formaldehyde. Titanium dioxide has the advantages of cheap, easy to obtain, non-toxic and harmless, stable chemical properties, and strong redox catalytic ability, but the absorption peak of titanium dioxide is at 400nm In the following, photocatalysts that belong to the ultraviolet light response type need ultraviolet light to pl...

AI Technical Summary

Problems solved by technology

As a photocatalyst that can catalyze the decomposition of formaldehyde, titanium dioxide is often used to remove formaldehyde. Titanium dioxide has the advantages of cheap, easy to obtain, non-toxic and harmless, stable chemical properties, and strong redox catalytic ability, but the absorption peak of titanium dioxide is at 400nm In the following, photocatalysts that belong to the ultraviolet light response type need ultraviolet light to play a photocatalytic effect. In sunlight, ultraviolet light only accounts for 7%, and ultraviolet light has a short wavelength and poor penetration. Therefore, the use of sunlight in daily life Irradiation of titanium dioxide to achieve catalysis, the effect is not good

Although noble metal photocatalysts are highly active visible light catalysts, they are expensive

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