A kind of porous metal-doped titanium dioxide self-cleaning composite nano-coating and its preparation method and application

Abstract

The invention discloses a porous metal doped TiO2 self-cleaning composite nano coating material, and a preparation method and application thereof. The preparation method comprises the following steps: firstly, adding a pore forming agent during a process of preparing TiO2 sol, thus preparing the TiO2 sol mixed with the pore forming agent; then, successively doping nano ruthenium and nano bismuth into a TiO2 matrix through a polyalcohol reduction method; finally, adding a flatting agent for carrying out aging treatment, thus obtaining the porous metal doped TiO2 self-cleaning composite nano coating material. When TiO2 is turned into anatase through thermal treatment, the pore forming agent which is used as an easy-to-decompose organic matter can be decomposed within a range of 300 to 600 DEG C, and pores of which the size is the same with the molecular size of the organic matter are reserved in crystal lattices of the anatase, so that lower-concentration organic pollutants in air can be effectively captured; meanwhile, a formed TiO2-Ru-Bi network is capable of quickening the migration speed of charge reactants and resultants, and the visible-light catalytic activity is also further increased; the pores and the TiO2-Ru-Bi network are in synergistic interaction, and the self-cleaning effect can be remarkably increased.

Description

technical field [0001] The invention belongs to the technical field of nano-coatings, and in particular relates to a porous metal-doped titanium dioxide self-cleaning composite nano-coating and its preparation method and application. Background technique [0002] In recent years, with the rapid development of urbanization, my country's highway and high-speed rail traffic has developed rapidly, therefore, a large number of traffic lights are needed. Current traffic lights include incandescent lamps, low-voltage halogen tungsten lamps, and rapidly developing LED lamps. Due to long-term exposure to the outdoors, sun and rain, and air pollution, it is easy to form pollution on the outer surface of the signal light. Long-term use will easily lead to a decrease in the intensity of the signal light and affect the use effect. Therefore, it needs to be replaced or cleaned regularly, thereby increasing the cost of use and unsafety. Self-cleaning glass can use sunlight, air, and rain...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the low adsorption rate of titanium dioxide nano-coatings in the prior art, the complicated curing methods, the lack of microstructure control of the coating forming by the traditional sol-gel method, and the difficulty in preparing titanium dioxide coatings by hydrothermal synthesis. To provide a porous ruthenium-bismuth doped titanium dioxide self-cleaning composite nano coating with high adsorption rate, good photocatalytic degradation performance, strong self-cleaning ability, and easy industrial scale production, which can be applied to glass and other substrates The coating of materials, such as spraying on the surface of the glass lampshade of traffic lights, has good self-cleaning ability and the ability to absorb and degrade organic matter in the air

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