Preparation method of nano-TiO2

Abstract

The invention belongs to the technical field of nano materials and particularly relates to a preparation method of nano-TiO2. The preparation method comprises steps as follows: step 1, N-butyl titanate is added to absolute ethanol and ultrasonically dispersed for 20-40 min, and a Ti alcohol solution is obtained; step 2, polyvinylpyrrolidone is added to the Ti alcohol solution and stirred until polyvinylpyrrolidone is completely dissolved, then sealed ultrasonic reaction is performed for 1-3 h, and a Ti alcohol dispersion is obtained; step 3, methylcellulose is added to water and stirred at constant temperature until methylcellulose is completely dissolved, and a dispersed aqueous solution is obtained; step 4, the dispersed aqueous solution is slowly dropwise added to the Ti alcohol dispersion and subjected to the ultrasonic reaction for 2-4 h, and a mixed slightly-turbid solution is obtained; step 5, the mixed slightly-turbid solution is added to a reaction kettle and stirred at the constant temperature to be gelatinized, a product is filtered while still hot and washed by absolute ethanol at the constant temperature, and gel is obtained; step 6, the gel is placed in aqueous ethanol, subjected to the ultrasonic reaction for 1-3 h and filtered, then ultraviolet light activation is performed, and nano-TiO2 is obtained.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a preparation method of titanium dioxide. 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 valence band potential becomes more pos...

AI Technical Summary

Problems solved by technology

However, the existing preparation methods of titanium dioxide powder, such as traditional solid-state reaction and sintering method and modern chemical vapor deposition method, physical vapor deposition method, chemical vapor infiltration method, sol-gel method, etc., these methods have complex processes, The disadvantage of high cost, while the particle size of titanium dioxide varies greatly, and the photocatalytic performance is unstable