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Method for preparing photo-catalytic cement-based material and method for preparing photocatalyst

A cement-based material and photocatalyst technology, applied in the field of photocatalysis, can solve the problems of high recombination efficiency, easy agglomeration, and inability to effectively disperse, and achieve the effect of improving photocatalytic efficiency and specific surface area

Active Publication Date: 2011-08-17
安徽海螺材料科技股份有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

In this method, due to the high recombination efficiency of the photogenerated electron-hole pairs of titanium dioxide, the photocatalytic performance is not outstanding; and, due to the wide band gap of titanium dioxide, for example, anatase is 3.2eV, and rutile is 3.0eV , can only absorb ultraviolet light with a wavelength of less than 380nm in sunlight, but the ultraviolet light in sunlight only accounts for 3-5%, therefore, the utilization rate of solar energy is low, and the photocatalytic activity is low under the action of visible light
In addition, this method uses activated carbon as a carrier, therefore, titanium dioxide is easy to agglomerate in cement-based materials and cannot be effectively dispersed, and is easily wrapped by cement hydration products and loses good photocatalytic performance.

Method used

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preparation example Construction

[0032] The invention discloses a preparation method of a photocatalytic cement-based material, comprising:

[0033] Provide up-conversion materials;

[0034] Mixing nano-titanium dioxide and fly ash to obtain nano-titanium dioxide loaded with fly ash;

[0035] Composite the up-conversion material and nano-titanium dioxide loaded with fly ash to obtain a composite, and heat and calcinate the composite to obtain a photocatalyst;

[0036] The photocatalyst is mixed with cement to obtain a photocatalytic cement-based material.

[0037] The up conversion material is preferably Er 0.01 Y 0.99 AlO 3 , the Er 0.01 Y 0.99 AlO 3 Preferably prepared according to the method of nitric acid-citric acid, specifically:

[0038] Will Er 2 o 3 and Y 2 o 3 Dissolve in nitric acid, add aluminum nitrate under stirring conditions to obtain a mixed solution;

[0039] adding citric acid into the mixed solution and heating to obtain a sol;

[0040] The sol is dried and ground to obtain a...

Embodiment 1

[0057] 0.19g of Er with a purity of 99.99wt% 2 o 3 and 10.39 g of Y with a purity of 99.99 wt% 2 o 3 Dissolved in 12.6ml of nitric acid to obtain yttrium nitrate solution and erbium nitrate solution, the aluminum nitrate solution was mixed with yttrium nitrate solution and erbium nitrate solution under stirring conditions to obtain a mixed solution;

[0058] Add solid citric acid to the mixed solution, wherein the total molar ratio of citrate and Er, Y and Al ions is 3:1, and then evaporate in a water bath at 85 °C until a light yellow, viscous sol is produced ;

[0059] Dry the sol in an oven at 130°C for 24 hours, then grind it into powder, and burn the ground powder in a tube furnace at 1200°C for two hours to obtain Er 0.01 Y 0.99 AlO 3 ;

[0060] Anatase-type nano-titanium dioxide and fly ash with a particle size of 300 mesh were mixed for 2 hours in a mass ratio of 1:2 to obtain nano-titanium dioxide loaded with fly ash;

[0061] The Er was ultrasonically 0.01 Y...

Embodiment 2

[0065] Adopt the method in embodiment 1 to prepare Er 0.01 Y 0.99 AlO 3 ;

[0066] Anatase-type nano-titanium dioxide and fly ash with a particle size of 320 mesh were mixed for 2 hours in a mass ratio of 1:2 to obtain nano-titanium dioxide loaded with fly ash;

[0067] The Er was ultrasonically 0.01 Y 0.99 AlO 3 Composite with the loaded titanium dioxide at a mass ratio of 1:15 to obtain a composite, put the obtained composite into a crucible and heat it in a muffle furnace, then dry it at 100°C for 24 hours, grind it and place it in a muffle furnace Calcining at 550°C for 50 minutes in a Furnace to obtain a photocatalyst;

[0068] The photocatalyst was mixed with Portland cement, water, sand and stone at a mass ratio of 1:10:3:8:15 to make a photocatalytic cement-based material, which was cured for 12 days and then air-dried for 2 days.

[0069] When the photocatalytic cement-based material is irradiated by sunlight, when the concentration of benzene in industrial was...

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Abstract

The embodiment of the invention discloses a method for preparing a photo-catalytic cement-based material and a method for preparing a photocatalyst. The method comprises the steps of mixing nanometer titanium dioxide and coal ash to obtain coal ash loaded nanometer titanium dioxide; compounding an up-conversion material with the coal ash loaded nanometer titanium dioxide; then heating and calcining to obtain a photocatalyst; and mixing the photocatalyst with cement to obtain a photo-catalytic cement-based material. Because a visible light can be converted to an ultraviolet light by the up-conversion material, the up-conversion material is compounded with the nanometer titanium dioxide to increase the photocatalysis efficiency of the photo-catalytic cement-based material. In addition, the specific surface area of the titanium dioxide can be increased by the coal ash so that the TiO2 is preferably dispersed in the cement, and thereby the photocatalysis efficiency of the photo-catalytic cement-based material is increased. Proved by experimental results, the photo-catalytic cement-based material prepared by using the preparation method disclosed by the invention obtains a disintegration rate of more than 80% to substances such as nitric oxide, benzene, formaldehyde and the like.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, more specifically, to a method for preparing a photocatalytic cement-based material and a method for preparing a photocatalyst. Background technique [0002] With the development of social economy, the pollution of human living environment is becoming more and more serious. For example, automobile exhaust emits a large amount of harmful organic substances and nitrogen oxides, and interior decoration materials also volatilize a large amount of harmful organic substances, which brings great harm to people's life and health. Therefore, the key to effectively control air pollution is to develop environmentally friendly materials with high efficiency, environmental protection and no secondary pollution. [0003] As a commonly used engineering material, cement-based materials are gradually developing in the direction of high performance and multifunctionality, such as thermal insulation, light w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00B01J23/10
CPCC04B28/02Y02W30/91C04B14/305C04B18/08C04B20/008C04B22/06
Inventor 李成武赵洪义朱化雨
Owner 安徽海螺材料科技股份有限公司
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