A kind of preparation method of nano titanium dioxide photocatalytic coating

Abstract

The invention discloses a preparation method of a novel nano-titania photocatalysis coating. The method comprises the steps that through a flame thermal spraying method, a pre-prepared suspension solution containing metal powder and nano-titania powder is used as a spraying raw material and sprayed on a pretreated matrix, and the nano-titania photocatalysis coating is obtained, wherein the solid-liquid mass ratio of the suspension solution is (1-50):100; the mass ratio of the nano-titania powder to the metal powder is (1-10):1. The preparation method has the advantages of easy operation, few technical processes, low cost and the like and is suitable for industrial production. By means of the preparation method, the thickness of the obtained nano-titania photocatalysis coating is 5-100 microns, the coating is good in photocatalytic performance and particularly good in photocatalytic organism degradation performance, the bonding strength of the coating with the matrix is high, and the coating is high in stability and has high application value and good market prospects in the field of photocatalytic degradation of organic pollutants.

Description

technical field [0001] The invention belongs to the field of photocatalytic coating preparation, and in particular relates to a preparation method of a nano-titanium dioxide photocatalytic coating using metal powder as a binder. Background technique [0002] 70% of the earth's surface area is covered by water bodies, but 97.47% of them are salt water, which cannot be used for people's daily life and industrial production. People can only rely on groundwater above 800m, rivers, lakes and water vapor, and the total amount of this part of water is less than 3% of the total water on the earth, and the limited fresh water resources are often wasted or polluted, making water resources increasingly tense. [0003] At present, commonly used sewage chemical treatment technologies include flocculation and sedimentation technology (corrosion inhibitors, scale inhibitors, bactericides, flocculants), oxidation technologies (supercritical water oxidation, photocatalytic oxidation, ultraso...

AI Technical Summary

Problems solved by technology

[0007] However, the use of nano-powder to disperse into a suspension, the combination of the secondary particles loaded on the matrix at high temperature and the matrix material is very loose, the catalytic coating is easy to fall off, and its practical application is difficult; the current solution mostly adopts the introduction of binder materials Increase the bonding strength between the coating and the substrate, but the coating effect of ordinary adhesives on nano-catalysts will reduce the photocatalytic activity of the photocatalytic coating (CN101264455A), affecting the overall performance and application of the coating