Catalytic titanium oxide nanoparticles and preparation method of dispersion liquid thereof

Abstract

The invention provides a method for preparing titanium oxide nanoparticles with catalytic function and its dispersion liquid. The present invention preforms an aqueous solution of silica sol, and adds a silver-containing titanium oxide precursor solution to the aqueous solution of silica sol, so that the hydrolysis process of the titanium oxide precursor and the generation of titanium oxide particles are limited by the silica sol network, thereby Overgrowth of titanium oxide particles is controlled. The particle diameter of the prepared nano-titanium dioxide is less than 3 nanometers, and there are two layers of self-assembled structures outside the nano-particles. The first layer is silicon dioxide crystals, and the obtained nano-titanium dioxide has a small particle size and stable dispersion.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, and in particular relates to a method for preparing titanium oxide nanoparticles with catalytic function and a dispersion liquid thereof. Background technique [0002] In 1967, Professor Kenichi Honda of the University of Tokyo and Akira Fujishima, a doctoral student, discovered that the electrolysis of water could be carried out by irradiating titanium dioxide electrodes with light. This is the famous photocatalytic reaction of "Hondo action", which catalyzes water or oxygen in the air into hydroxyl radicals (OH) and superoxide anion radicals (O2 ), active oxygen (HO2 ) with strong oxidation ability. , H2O2) and other photoactive groups with extremely strong oxidizing ability. The energy of these photoactive groups is equivalent to the high temperature of 3600K, and they have strong oxidizing properties. These strong oxidizing groups can effectively decompose various Organic compounds an...

AI Technical Summary

Problems solved by technology

[0003] 1. The particle size of the prepared titanium dioxide is relatively large, generally 5-100 nanometers, its specific surface area is small, the number of surface atoms is small, and the surface effect of ultrafine particles is not significant. On the one hand, the less light energy absorbed, the e- and The smaller the density of h+ pairs, the less the adsorbed reactants, and the less the concentration of oxidized or reduced substances, so the visible light catalytic activity will be low.

[0004] 2. High manufacturing cost, low processing effect and slow processing speed, which directly lead to increased processing cost and greatly reduced economic value

[0005] 3. The large particle size results in low adhesion. The nano-titanium dioxide prepared by the prior art needs to be added with an adhesive, which is poisonous to the human body and livestock, so it is limited in the application field.