Preparation method of spray-type cement concrete capable of degrading NOx

Abstract

The invention discloses a preparation method of spray-type cement concrete capable of degrading NOx, which comprises the following steps: (1) preparation of large-pore-size water-permeable cement concrete; (2) preparation of titanium dioxide water-based slurry: thoroughly mixing titanium dioxide powder and activated carbon to obtain a titanium dioxide powder-activated carbon mixture, mixing the cement-titanium dioxide powder-activated carbon mixture, a concrete penetrating and curing agent and a dispersing agent, and uniformly stirring with water to obtain the titanium dioxide water-based slurry; and (3) preparation of spray-type concrete: spraying the titanium dioxide water-based slurry to the surface layer of the large-pore-size water-permeable cement concrete until the titanium dioxide water-based slurry permeates into the surface layer by 8-12mm, and curing the cement concrete to obtain the spray-type cement concrete capable of degrading NOx. The test result indicates that the decomposition rate of the spray-type photocatalytic cement concrete for NOx is up to higher than 50%.

Description

technical field

[0001] The invention relates to the technical field of photocatalysis, in particular to a degradable NO X The preparation method of spraying type cement concrete. Background technique

[0002] With the continuous increase of the number of automobiles, the pollution problem caused by automobile exhaust emissions is becoming more and more serious, and the toxic gas mainly NOx in the pollutants has brought a huge threat to people's health. Therefore, the development of efficient and sustainable NOx degradation Environmentally friendly pavement materials are a key technology for effectively controlling exhaust pollution.

[0003] Nano-TiO 2 As a semiconductor photocatalyst, the material shows good prospects in environmental pollution control. Scholars at home and abroad for nano-TiO 2 In the process of research and development of photocatalytic materials, the problems that need to be broken through mainly come from two aspects: (1) nano-TiO 2 The agglomerati...

Examples

Embodiment 1

[0036] (1) TiO 2 Fully mix with activated carbon at a mass ratio of 1:1 to make nano-TiO 2 The material is not easy to agglomerate and easy to disperse.

[0037] (2) Cement, TiO 2 The mixture prepared in proportion with activated carbon, concrete penetration curing agent and dispersant polycarboxylate are mixed in a ratio of 1:0.06:0.03:0.06 by weight to make a nano-titanium dioxide aqueous slurry with a mass concentration of 5g / L.

[0038] (3) Make sand-free permeable cement concrete, adopt artificial molding, cover the surface with a plastic film after molding, and let it stand for one to two days and nights at a room temperature of 20°C ± 5°C and a relative humidity greater than 50%, and then demoulding. Then the prepared nano-TiO 2 The water-based slurry was sprayed on the surface of the permeable concrete specimen within a depth of 10mm, and finally the specimen was placed in a standard curing room (temperature 20°C ± 5°C, humidity greater than 95%) for 28 days.

[0...

Embodiment 2

[0041] (1) TiO 2 Fully mix with activated carbon at a mass ratio of 1:1 to make nano-TiO 2 The material is not easy to agglomerate and easy to disperse.

[0042] (2) Cement, TiO 2 The mixture prepared in proportion with activated carbon, concrete penetration curing agent and dispersant polycarboxylate are mixed in a ratio of 1:0.1:0.03:0.06 by weight to make a nano-titanium dioxide aqueous slurry with a mass concentration of 5g / L.

[0043] (3) To make sand-free permeable cement concrete, use artificial molding, cover the surface with plastic film after molding, and let it stand for one to two days and nights at a room temperature of 20°C ± 5°C and a relative humidity greater than 50%, and then demoulding. Then the prepared nano-TiO 2 The water-based slurry was sprayed on the surface of the permeable cement concrete specimen within a depth of 10 mm, and finally the specimen was placed in a standard curing room (temperature 20°C ± 5°C, humidity greater than 95%) for 28 days ...

technical field

[0001] The invention relates to the technical field of photocatalysis, in particular to a degradable NO X The preparation method of spraying type cement concrete. Background technique

[0002] With the continuous increase of the number of automobiles, the pollution problem caused by automobile exhaust emissions is becoming more and more serious, and the toxic gas mainly NOx in the pollutants has brought a huge threat to people's health. Therefore, the development of efficient and sustainable NOx degradation Environmentally friendly pavement materials are a key technology for effectively controlling exhaust pollution.

[0003] Nano-TiO 2 As a semiconductor photocatalyst, the material shows good prospects in environmental pollution control. Scholars at home and abroad for nano-TiO 2 In the process of research and development of photocatalytic materials, the problems that need to be broken through mainly come from two aspects: (1) nano-TiO 2 The agglomerati...

Examples

Embodiment 1

[0036] (1) TiO 2 Fully mix with activated carbon at a mass ratio of 1:1 to make nano-TiO 2 The material is not easy to agglomerate and easy to disperse.

[0037] (2) Cement, TiO 2 The mixture prepared in proportion with activated carbon, concrete penetration curing agent and dispersant polycarboxylate are mixed in a ratio of 1:0.06:0.03:0.06 by weight to make a nano-titanium dioxide aqueous slurry with a mass concentration of 5g / L.

[0038] (3) Make sand-free permeable cement concrete, adopt artificial molding, cover the surface with a plastic film after molding, and let it stand for one to two days and nights at a room temperature of 20°C ± 5°C and a relative humidity greater than 50%, and then demoulding. Then the prepared nano-TiO 2 The water-based slurry was sprayed on the surface of the permeable concrete specimen within a depth of 10mm, and finally the specimen was placed in a standard curing room (temperature 20°C ± 5°C, humidity greater than 95%) for 28 days.

[0...

Embodiment 2

[0041] (1) TiO 2 Fully mix with activated carbon at a mass ratio of 1:1 to make nano-TiO 2 The material is not easy to agglomerate and easy to disperse.

[0042] (2) Cement, TiO 2 The mixture prepared in proportion with activated carbon, concrete penetration curing agent and dispersant polycarboxylate are mixed in a ratio of 1:0.1:0.03:0.06 by weight to make a nano-titanium dioxide aqueous slurry with a mass concentration of 5g / L.

[0043] (3) To make sand-free permeable cement concrete, use artificial molding, cover the surface with plastic film after molding, and let it stand for one to two days and nights at a room temperature of 20°C ± 5°C and a relative humidity greater than 50%, and then demoulding. Then the prepared nano-TiO 2 The water-based slurry was sprayed on the surface of the permeable cement concrete specimen within a depth of 10 mm, and finally the specimen was placed in a standard curing room (temperature 20°C ± 5°C, humidity greater than 95%) for 28 days ...

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