Nano photocatalysis porous concrete product and preparation method thereof

A technology of permeable concrete and nano-light, which is applied in the field of nano-photocatalytic permeable concrete products and its preparation, can solve the problems of small internal surface area, long contact time, and short contact time, and achieve high photocatalytic degradation of NOX efficiency, large contact area, The effect of high photocatalytic efficiency

Inactive Publication Date: 2009-12-02
ZHEJIANG UNIV OF TECH +1
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  • Abstract
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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 conta...

Method used

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  • Nano photocatalysis porous concrete product and preparation method thereof

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Embodiment 1

[0027] Embodiment 1: Preparation of nitrogen-doped nano-titanium dioxide powder

[0028] Get 100g of anatase-type nano-titanium dioxide powder (P25, Shanghai Kaiyin Chemical Co., Ltd.), and take 10.34g of ammonium sulfate as 1:8 according to the material ratio of nitrogen and titanium, mix it and load it into a ball mill for 2 hours, and set the speed of the ball mill at 500-600 revolutions per minute;

[0029] Put the ball-milled powder in a muffle furnace, raise the temperature to 600°C, keep it warm for 5 hours, and get nitrogen-doped nano-titanium dioxide powder after cooling, which is ready for use.

Embodiment 2

[0031] Use 42.5-grade ordinary cement, natural sand with a gradation of 0.15-4.75mm that meets the requirements of national standards, SN-II naphthalene-based high-efficiency water reducer (Hangzhou Construction Engineering Building Materials Co., Ltd.) and water, according to aggregate: cement: water: Water reducer = 3.5:1:0.31:0.025 Prepare and stir to obtain ordinary concrete mixture, which is mechanically pressed to form a dense concrete product with a size of 60mm×100mm×200mm.

[0032] Using anatase nano-TiO 2 (P25) as photocatalyst, adopt SN-II naphthalene series high-efficiency water reducer (Hangzhou Construction Engineering Building Materials Co., Ltd.) as dispersant, the dosage of dispersant is 2.5% of P25 quality, add the measured P25 and dispersant into water, After stirring evenly, use a planetary ball mill to mill for 1 hour to obtain nano-TiO with a mass concentration of 5%. 2 Dispersions.

[0033] After dense concrete products are cured for 1 day, nano-TiO wi...

Embodiment 3

[0035] Use 42.5-grade ordinary cement, single-grain natural sand with a gradation of 0.3-0.6mm, SN-II naphthalene-based high-efficiency water-reducing agent (Hangzhou Construction Engineering Building Materials Co., Ltd.) and water, according to aggregate: cement: water: water-reducing Agent = 3.0: 1: 0.30: 0.025 was prepared and stirred to obtain a permeable concrete mixture, which was mechanically pressed to form a permeable concrete product with a size of 60mm×100mm×200mm.

[0036] Using anatase nano-TiO 2 (P25) as photocatalyst, adopt SN-II naphthalene series high-efficiency water reducer (Hangzhou Construction Engineering Building Materials Co., Ltd.) as dispersant, the dosage of dispersant is 2.5% of P25 quality, add the measured P25 and dispersant into water, After stirring evenly, use a planetary ball mill for 1 hour to obtain nano-TiO with a mass concentration of 2%. 2 Dispersions.

[0037] After curing permeable concrete products for 1 day, use nano-TiO with a mass...

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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...

Claims

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Application Information

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IPC IPC(8): C04B41/65
CPCC04B2111/00827C04B2103/302C04B28/02C04B2103/408
Inventor 孔德玉杨杨吴炎平余亚超李国华陈连禄
Owner ZHEJIANG UNIV OF TECH
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