Carbon nitride modified titanium dioxide superhydrophilic porous film and its preparation method and application

Abstract

A carbon nitride-modified titanium dioxide super-hydrophilic porous film and a preparation method and use thereof. The method comprises the following steps: calcining dicyandiamide or tripolycyanamide as a precursor, to prepare a carbon nitride nanosheet; ultrasonically dispersing the carbon nitride nanosheet in anhydrous ethanol so as to obtain a carbon nitride dispersion liquid, then adding a titanium dioxide precursor, diacetone and an alcohol amine, uniformly stirring to obtain a uniform solution, dropwise adding a mixed liquid prepared from the anhydrous ethanol, water and an acid into the uniform solution so as to obtain a carbon nitride / titanium dioxide composite sol, aging for a period of time, applying the carbon nitride / titanium dioxide composite sol on a preprocessed substrate, drying and irradiating using ultraviolet, so as to obtain a carbon nitride-modified titanium dioxide super-hydrophilic porous film. The film is prepared from the raw materials which are cheap and easily available, the preparation condition is easy to realize, and the film can be obtained without calcining at a high temperature, so that the preparation cost of a super-hydrophilic film article is reduced, facilitating the popularization and application of the technique.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional materials, and in particular relates to a carbon nitride-modified titanium dioxide superhydrophilic porous film and a preparation method and application thereof. Background technique [0002] The super-hydrophilic film can make water droplets spread on the surface and form a continuous or nearly continuous water film, so that the light is free from interference, and the light can pass through directly. It has an excellent anti-fog effect on glass or mirrors. Further, with the help of photocatalytic coating The layer can degrade the organic pollutants adhering to the surface and use the water film to remove it to achieve the self-cleaning effect. On the other hand, the ultra-thin water film formed on the surface is conducive to the rapid evaporation of water, which is of great significance for the cooling of the cold plate . Therefore, superhydrophilic film technology has been wi...

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Problems solved by technology

[0003] For the concept of super-hydrophilic film, it is generally believed that when the surface water contact angle is less than 5 degrees, it can be regarded as super-hydrophilic. Traditional titanium dioxide films need to be irradiated with ultraviolet light to achieve super-hydrophilicity, which is undoubtedly a limitation. In addition to its use, research and preparation of titanium dioxide films that can be super-hydrophilic under natural light conditions and have certain photocatalytic activity are very important for its popularization and application.