Nano photocatalysis porous concrete product and preparation method thereof

Abstract

The invention provides a nano photocatalysis porous concrete product and a preparation method thereof. The nano photocatalysis porous concrete product is prepared by the method comprising the following steps: curing press formed porous concrete for 1 to 7 days, then soaking the porous concrete in nano TiO2 dispersion liquid of which the mass concentration is between 2 and 10 percent for 1 to 5 minutes, and taking out the cured porous concrete to obtain the nano photocatalysis porous concrete product. The nano photocatalysis porous concrete product has the following main advantages: (1) compared with dense concrete, the nano photocatalysis porous concrete product has a larger contact area between the nano photocatalysis porous concrete product and polluted gas or liquid, has high photocatalysis efficiency, and can be applied to air purification treatment or water treatment; and (2) compared with P25, the nano photocatalysis porous concrete product adopts the P25 doped with nano titanium dioxide powder to have higher photocatalysis Nox degradation efficiency.

Description

(1) Technical field [0001] The invention relates to a nano photocatalytic permeable concrete product and a preparation method thereof. (2) Background technology [0002] Since the discovery of irradiated TiO by Fujishima et al. in 1972 2 Since the continuous redox reaction of water can occur on the surface, the elimination and degradation of pollutants by using the principle of photocatalytic reaction has become one of the most active research directions. As a photocatalyst, TiO 2 It is favored by people because of its high activity, safety, low price and no pollution. In recent years, people have paid attention to nano-TiO 2 And the research of nanotubes, nanowires, etc. has injected new vitality into this field. Studies have shown that TiO with a particle size of less than 15nm 2 The particles have obvious surface effects and quantum effects, and show extraordinary oxidation and reduction capabilities under the action of light, and the photocatalytic efficiency is grea...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the technical problems in the prior art that the inner surface area of ​​the dense concrete carrier is small, the contact area between the photocatalyst on the concrete surface and the polluted air is small, the contact time is short, and the photocatalytic efficiency and long-term performance of the nano-photocatalytic concrete material are poor, the present invention combines nano Photocatalytic technology is applied to concrete pavement bricks for sidewalks, providing a nano-photocatalytic permeable concrete with a large inner surface area of ​​the carrier, a large contact area between the photocatalyst and polluted air, and a long contact time, so it has good photocatalytic performance and long-lasting performance Products and their preparation methods, and the corresponding modification of the original photocatalytic technology to enhance its visible light excitation rate and photon generation rate, while improving its photocatalytic performance and its stability and long-term effect under alkaline conditions Finally, a nano-photocatalytic permeable concrete pavement preparation technology that can reduce or even eliminate harmful pollutants under sunlight conditions

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