Interior photocatalytic coating, preparation method and application thereof

Abstract

The invention relates to an interior photocatalytic coating, the preparation method and application thereof. The raw materials of the photocatalytic coating comprise titanium dioxide or a composite titanium dioxide sol containing other oxide and gold nanoparticles, wherein the content of the gold nanoparticles is 0.005-0.1g / 100mL. By the visible light absorption effect (the surface plasmon resonance effect) of Au nanoparticles, the photocatalytic coating undergoes a photocatalysis reaction under the effect of visible light. The disadvantages of using present titanium dioxide photocatalytic coatings usually outdoors (under sunshine irradiation) or exposed to ultraviolet rays are solved. The prepared photocatalytic coating containing Au nanoparticles can be used indoors and has functions of sterilization, pollutant oxidation and decomposition under the effect of visible light, greatly widening the application range of the photocatalytic coating.

Description

technical field [0001] The invention relates to indoor coatings in building materials, in particular to a photocatalytic coating capable of photocatalytic action under the action of indoor visible light, as well as its preparation method and application. Background technique [0002] How to make indoor building materials and sanitary utensils sterilize, inhibit bacteria and purify air is a goal pursued by the current environmental protection product research institute. For this reason, various techniques have been developed to achieve this goal. At present, the sterilization technologies used in the market mainly include: (1) Sterilization using inorganic heavy metal ions. For example, loading antibacterial metal salts on a pore size of (3-10)×10 -10 As an additive on the carrier of pigments, paints, paints, putty powder or building cement products, so that the building materials have a sterilizing function; The nanometer zinc-loaded composite antibacterial material can b...

AI Technical Summary

Problems solved by technology

[0003] Although the sterilizing coatings or sterilizing agents prepared by the above-mentioned technology have different degrees of sterilizing or bacteriostatic effects, there are still some insurmountable shortcomings: organic and inorganic sterilizing agents use their chemical interaction with bacteria to kill bacteria. Bacteria, but after the chemical interaction between these substances and bacteria, the activity is difficult to regenerate, so its sterilizing performance gradually fails; for TiO 2 Sterilization coatings that use photocatalysis can regenerate their sterilizing activity and have the effect of purifying air. However, when used indoors, the photocatalysis is difficult to fully exert due to the weak light.

And for directly adding silver nitrate aqueous solution in the titanium dioxide suspension solution, but this solution is poor in stability, easy to precipitate silver oxide, and when it is coated on the surface of the base material, the performance is the same as other methods of introducing silver ions, and the brownish color of silver oxide appears. black and affect the appearance, thus limiting the practical application of the composite technology

In order to solve the problems of poor stability and easy discoloration that affect the appearance during the combined use of this photocatalyst and metal ions, especially when it is coated on the surface of wall coatings, it is prone to oxidative discoloration and other phenomena. We have developed a New technology (patent CN200610018270.0), that is, silver ions are complexed or added in the form of silver iodide

However, in this technology, photocatalysis is limited and relies more on chemical action

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