Preparation method of nanometer titanium dioxide

Abstract

The invention belongs to the technical field of environment-friendly materials, and particularly relates to a preparation method of nanometer titanium dioxide. The preparation method comprises the following steps: 1, adding n-butyl titanate into absolute ethanol, then adding a dispersing agent, ultrasonically dispersing till complete dissolution to obtain n-butyl titanate alcohol dispersion; 2, adding a polymer surfactant into distilled water, uniformly stirring till complete dissolution to obtain a dropping solution; 3, slowly dropwise adding the dropping solution into the n-butyl titanate alcohol solution, sealing, slightly heating while stirring for 1-3 hours to obtain a suspension; 4, placing the suspension in a reaction kettle, performing a vacuum distillation reaction for 1-3h, cooling, then filtering at low temperature to obtain a wrapped titanium dioxide precipitate; 5, adding the wrapped titanium dioxide precipitate into an aqueous ethanol solution, performing an ultrasonic reaction for 10-20min, then taking and drying at a high temperature to obtain the nanometer titanium dioxide. Through hydrolysis of the n-butyl titanate, and by virtue of the dual action of polyvinylpyrrolidone and sodium lauryl sulfate, a good dispersion system can be formed, so that agglomeration of titanium dioxide is prevented.

Description

technical field [0001] The invention belongs to the technical field of environmental protection materials, and in particular relates to a preparation method of nano titanium dioxide. Background technique [0002] TiO as one of 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...

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 is that the resulting mixed crystal form and uneven particle size are often obtained, because the photocatalytic degradation activity of rutile titanium dioxide and amorphous titanium dioxide is very poor

Images