Preparation method and application of massive titanium-based aerogel

Abstract

The invention provides a preparation method and application of massive titanium-based aerogel. A zinc oxide doped titanium dioxide massive aerogel material is characterized in that by using zinc acetate as a Zn source and butyl silicate as a Ti source, a zinc acetate solution is added in titanium colloidal sol hydrolyzed by butyl titanate according to different Zn / Ti molar ratios to obtain a mixture; after the mixture is uniformly stirred, the mixture is subjected to standing at a room temperature to obtain wet gel; gel surface modification treatment is carried out by using a tetraethyl orthosilicate / EtOH mixed solution with certain concentration, and then ambient pressure drying is carried out after solvent replacement, and finally, the zinc oxide doped titanium dioxide massive aerogel with silicon dioxide enhanced frame strength is obtained. A photocatalytic test result proves that a degradation ratio of a ZnO-doped titanium dioxide aerogel sample on rhodamine B under visible light is superior to that of a sample which is not doped with zinc oxide under the same preparation condition. The aerogel material prepared by adopting the method has the advantages of excellent photocatalytic performance under the visible light, good heat stability, easiness for recycling the massive sample, mild preparation conditions and simple skeleton strength process.

Description

technical field [0001] The invention belongs to the field of porous materials, and in particular relates to a preparation method of titanium-based airgel with zinc oxide doping and silicon dioxide reinforced skeleton structure. Background technique [0002] Airgel is a special gel that replaces the liquid in the gel with gas without essentially changing the network structure of the gel itself. It is the product of hydrogel or organic gel after drying. Aerogels can be conductors or insulators, transparent or nearly opaque, chemically inert or superactive. Aerogels can be considered as a bridge between the nano and macro worlds, and the prospects for their applications are limitless. Airgel materials have the advantages of light weight, heat insulation, high porosity, etc., and can be widely used in technical fields such as acousto-optic heat. With the increase of industrial pollution in recent years, finding a waste water treatment method without secondary pollution has alw...

AI Technical Summary

Problems solved by technology

[0003] However, the silicon-based or titanium-based aerogels that are currently being studied are limited due to their high production costs, long cycle times, difficult drying process, low strength of finished products, and small size.

As we all know, anatase-type titanium dioxide has a good photocatalytic degradation effect on organic dyes under ultraviolet light. Most of the anatase-type titanium dioxide catalysts studied at present are nano-materials, which are easy to cause secondary pollution and have the problem of difficult recycling.

The currently studied titanium dioxide aerogels have disadvantages such as difficult molding and poor thermal stability, and the conditions for photocatalytic degradation of organic dyes are mostly under ultraviolet light.

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