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Porous cement-based photocatalytic material and preparation process thereof

A technology of cement-based materials and catalytic materials, which is applied in the directions of catalyst carriers, physical/chemical process catalysts, chemical instruments and methods, etc. Catalytic efficiency and other issues, to achieve the effect of increasing the loading and interfacial bonding force, improving the photocatalytic efficiency and long-term activity, and improving the photocatalytic efficiency

Active Publication Date: 2013-03-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The modification of photocatalytic materials has a certain effect on improving the utilization rate of visible light and photocatalytic activity, but since the photocatalytic materials are added in the process of preparing porous cement-based materials, it is not conducive to the dispersion of photocatalytic materials, making a large amount of Photocatalytic materials are wrapped by cement hydration products. In addition, due to the poor light transmission properties of ordinary Portland cement-based materials and dense hydration products, the wrapped photocatalytic materials cannot be rationally utilized and a large amount of waste is wasted. Photocatalytic materials, which increase the cost of photocatalytic materials and also reduce the photocatalytic efficiency of materials

Method used

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Examples

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Effect test

Embodiment 1

[0035] A porous cement-based photocatalytic material, which is prepared according to the following steps:

[0036] (1) Pretreatment of porous cement-based carrier: set the bulk density to 400kg / m 3 , Portland porous cement-based materials with an average pore diameter of less than 2mm (commercially available, silicate porous insulation bricks) are placed in an ultrasonic cleaner for ultrasonic cleaning and ultrasonic opening for 0.5h, then taken out, dried, and set aside;

[0037] (2) Interfacial activation treatment of porous cement-based carrier: place the Portland porous cement-based material pretreated in step (1) in 10 -4 mol / L sodium hydroxide solution for 1 hour after ultrasonic activation, take it out, dry it, and set it aside;

[0038] (3) Dispersion of photocatalyst: Put nano-titanium dioxide powder (commercially available, Degussa P25, rutile / anatase mixed crystal form) photocatalyst into an aqueous solution with a volume fraction of 50% absolute ethanol to make na...

Embodiment 2

[0043] A porous cement-based photocatalytic material, which is prepared according to the following steps:

[0044] (1) Pretreatment of porous cement-based carrier: set the bulk density to 400kg / m 3 , the sulphoaluminate porous cement-based material with an average pore diameter of less than 1mm (commercially available, sulphoaluminate porous insulation board) is placed in an ultrasonic cleaner for ultrasonic cleaning and ultrasonic opening for 12 hours, then taken out, dried, and set aside;

[0045](2) Interfacial activation treatment of porous cement-based carrier: place the sulfoaluminate porous cement-based material pretreated in step (1) in 10 -1 mol / L potassium hydroxide solution for 1 hour after ultrasonic activation, take it out, dry it, and set it aside;

[0046] (3) Dispersion of photocatalyst: Put nano-titanium dioxide powder (commercially available, Degussa P25, rutile / anatase mixed crystal form) photocatalyst into an aqueous solution with a volume fraction of 80% ...

Embodiment 3

[0050] A porous cement-based photocatalytic material, which is prepared according to the following steps:

[0051] (1) Pretreatment of porous cement-based carrier: set the bulk density to 200kg / m 3 , the magnesium oxychloride porous cement-based material (commercially available, magnesium oxychloride cement porous insulation board) with an average pore diameter of less than 0.2 mm is placed in an ultrasonic cleaner for ultrasonic cleaning and ultrasonic opening for 1 hour, then taken out, dried, and set aside;

[0052] (2) Interfacial activation treatment of porous cement-based carrier: place the magnesium oxychloride porous cement-based material pretreated in step (1) in silica sol with a solid content of 40% for ultrasonic activation for 1 hour, take it out, dry it, and set aside;

[0053] (3) Dispersion of photocatalyst: Put nano-titanium dioxide powder (commercially available, Degussa P25, rutile / anatase mixed crystal form) photocatalyst into 95% absolute ethanol aqueous s...

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Abstract

The invention discloses a porous cement-based photocatalytic material and a preparation process thereof. The porous cement-based photocatalytic material is prepared from a porous cement-based carrier, an interface processing agent and a photocatalytic agent. The preparation method comprises the following steps of pre-treatment of the porous cement-based carrier, interface activation treatment of the porous cement-based carrier, dispersion of the photocatalytic agent, loading of the photocatalytic agent and post-treatment of materials. The porous cement-based photocatalytic material and the preparation process thereof have the advantages that an ultrasonic pore opening manner is adopted to improve the through-hole rate of a porous cement-based material; a manner of combining the interface treatment and the negative-pressure loading is used for activating the surface property of the porous cement-based material and improving the loading amount and the uniformity, so as to improve the photocatalytic efficiency and the long-period activity; and furthermore, a coordination effect of the porous cement-based material and the photocatalytic material is combined to improve the treatment capability on harmful gas.

Description

technical field [0001] The invention relates to the technical field of novel environmental protection functional building materials, in particular to a porous cement-based photocatalytic material and a preparation process thereof. Background technique [0002] Porous cement-based material is a new type of environmentally friendly functional building material developed in recent years. It has many functions such as light weight, sound insulation, and heat insulation. At present, porous cement-based materials are mainly used in interior wall panels, house insulation, compensation foundations and roof slopes, etc. The excellent characteristics of porous cement-based materials will make them more widely used. Porous cement-based materials generally have abundant pores and can absorb a large amount of harmful gases, but they do not have the function of purifying gases, so their ability to deal with harmful gases is also limited. [0003] Photocatalytic purification technology is...

Claims

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Application Information

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IPC IPC(8): B01J35/10B01J32/00B01J21/08B01J21/14B01J21/06C04B28/04C04B28/06C04B28/32
Inventor 王发洲杨露胡曙光丁庆军关凌岳董跃
Owner WUHAN UNIV OF TECH
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