Method for preparing nano titanium dioxide heterogeneous composite membrane

Abstract

The invention relates to a method for preparing a nano titanium dioxide heterogeneous composite membrane. In the invention, strict process flow is adopted, and precision and purity of chemical materials are controlled. The method comprises the following steps: cutting, grinding, cleaning and drying flat glass; preparing titanium dioxide seven-element mixed sol; performing spin coating on titanium dioxide inorganic membrane in a layered manner; and carrying out vacuum evaporation of metallic copper membrane layer and vacuum heat treatment to obtain the nano titanium dioxide heterogeneous composite membrane, wherein the thicknesses of inorganic titanium dioxide membrane layer are 100nm and 80nm, the thickness of metallic copper membrane layer is 60nm, and the thickness of the total membrane layer is 240nm. The product prepared by the invention has the advantages of advanced technology, reasonable and strict membrane structure, high purity, and good photochemical catalysis performance under the sun. The membrane purity is up to 99.5%. The method is an ideal method for preparing nano titanium dioxide heterogeneous composite membrane.

Description

technical field The invention relates to a method for preparing a nano-titanium dioxide heterogeneous composite film, which belongs to the technical field of photocatalytic film preparation methods for inorganic semiconductor materials. Background technique Titanium dioxide is an inorganic semiconductor material with a wide band gap. The theoretical band gap is 3.2eV. Under ultraviolet light, electrons in the valence band of titanium dioxide can be excited to the conduction band to form separated electron-hole pairs. With strong oxidation and reduction ability, it can undergo oxidation and reduction reactions with organic pollutants, so as to achieve the purpose of degrading organic pollutants. Titanium dioxide is a white pigment with the advantages of non-toxicity, stable chemical properties, and low price. However, due to the high cost of ultraviolet light sources, the large-scale application of titanium dioxide in the field of environmental purification technology is lim...

AI Technical Summary

Problems solved by technology

Titanium dioxide is a white pigment with the advantages of non-toxicity, stable chemical properties, and low price. However, due to the high cost of ultraviolet light sources, the large-scale application of titanium dioxide in the field of environmental purification technology is limited. Due to the high recombination rate of separated charges, Also affects quantum yield issues

There are many methods for the preparation of titanium dioxide composite films, such as chemical vapor deposition, coating drying, etc., but these methods have some disadvantages and deficiencies, some of which are complex, and the product purity is low; Substrate connection strength is low, easy to fall off, and chemical and physical properties are unstable, etc.

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