Preparation method of titanium dioxide with controllable particle size

Abstract

The invention discloses a preparation method of titanium dioxide with the controllable particle size. The preparation method comprises the following steps: step 1, adding ethyl cellulose into absoluteethyl alcohol and stirring until the ethyl cellulose is completely dissolved to obtain a dispersed alcohol solution; step 2, slowly and dropwise adding tetrabutyl titanate into the dispersed alcoholsolution, evenly stirring and standing under the low temperature to obtain a titanium alcohol solution; step 3, adding methyl cellulose into the titanium alcohol solution and performing ultrasonic dispersion to form a precipitation solution; step 4, slowly and dropwise adding distilled water into the precipitation solution, evenly stirring under the low temperature until dropwise adding is finished, then performing low-temperature ultrasonic reaction for 2 to 4 hours, performing heating ultrasonic reaction for 2 to 4 hours and obtaining a suspended and turbid sol solution under the constant temperature; step 5, filtering the suspended and turbid sol solution and utilizing absolute ethyl alcohol to wash under the constant temperature to obtain gel; step 6, adding the gel into an ultrasonicreaction kettle to perform circular water bath ultrasonic reaction for 2 to 5 hours and cooling and filtering to obtain nano titanium dioxide. According to the preparation method disclosed by the invention, the ethyl cellulose is utilized as a wrapping agent to wrap the tetrabutyl titanate, so that the purpose of indirectly controlling the particle size of the nano titanium dioxide is achieved.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a method for preparing titanium dioxide with a controllable particle size. Background technique [0002] TiO is currently used as one of the semiconductor photocatalysts 2 Photocatalytic materials are currently the most researched new type of environmentally friendly materials, and the properties of photocatalysts are the key factors in the photocatalytic oxidation process. TiO 2 The crystal form, grain size and particle diameter, surface state and other factors have a great influence on its photocatalytic performance. Nanoparticles with large surface area have good catalytic activity and selectivity due to their surface effect and volume effect. Nano-TiO 2 Due to its quantum size effect, the conduction band and valence band energy levels become discrete energy levels, the energy gap widens, the conduction band potential becomes more negative, and the ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems in the prior art, the present invention provides a method for preparing titanium dioxide with controllable particle size, which solves the problem of difficulty in controlling the particle size of existing nanometer titanium dioxide. Ethyl cellulose is used as a wrapping agent, and n-butyl titanate Wrapped to achieve the purpose of indirectly controlling the particle size of nano-titanium dioxide

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