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Photocatalytic cement mortar containing boron, carbon and nitrogen and preparation method thereof

A technology of cement mortar and boron carbon nitrogen, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc. Problems such as the contact area of ​​the light source and the production method of photocatalytic cement mortar have not been seen, so as to achieve the effect of promoting large-scale application, improving lubricity, and good adsorption performance

Active Publication Date: 2021-11-02
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) Due to the limitation of the band gap of the material itself, the photocatalysis of titanium dioxide mainly depends on ultraviolet rays, which account for about 4.5% of sunlight; graphite phase carbon nitride has no photocatalytic performance or mainly depends on the generation of blue-violet light in the solar spectrum Photocatalytic reaction, both materials have low utilization rate of sunlight, which to some extent hinders the popularization and application of photocatalytic cement mortar
[0004] (2) The common structural forms of titanium dioxide and graphite phase carbon nitride are mainly one-dimensional structure and two-dimensional structure, which determine that the specific surface area of ​​titanium dioxide and graphite phase carbon nitride is small, and photogenerated electrons and holes are easy to generate. Composite, poor photocatalytic effect
[0005] (3) At present, most nano-photocatalytic materials are directly mixed in cement. Since nano-materials are prone to agglomeration, it is difficult to mix them evenly with cement and sand, which not only affects the strength of cement mortar, but also reduces the strength of nano-photocatalysis. The contact area between the material and the light source affects the photocatalytic effect during use
[0006] Boron carbon nitrogen is an emerging non-metallic inorganic semiconductor material in recent years. It has been gradually used in lithium-ion batteries, gas adsorption and supercapacitors, etc. literature

Method used

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  • Photocatalytic cement mortar containing boron, carbon and nitrogen and preparation method thereof

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Experimental program
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Embodiment 1

[0044]In this embodiment, the raw material ratio of the cement mortar by weight is: 4 parts of cement, 10 parts of machine-made sand, 0.004 part of boron carbon nitrogen, 0.005 part of nano-montmorillonite, and 2 parts of deionized water.

[0045] In the present embodiment, the preparation method of photocatalytic cement mortar is carried out as follows:

[0046] Step 1: adding nano-montmorillonite to tap water, using a disperser to stir at a speed of 6000r / min for 30 minutes to obtain a film-attached liquid; the volume of the tap water is 0.5 times the volume of the machine-made sand;

[0047] Step 2: Stir the machine-made sand with a washing bucket for 5 minutes, put it on the mesh screen to dry for 25 minutes, and then place it in an oven to heat and dry; add the dried machine-made sand to the film-attached liquid and stir for 5 minutes, then Pour it into a tray and place it in an oven to heat and dry it, so that the nano-montmorillonite adheres to the surface of the machin...

Embodiment 2

[0052] In this embodiment, the raw material ratio of the cement mortar by weight is: 5 parts of cement, 15 parts of machine-made sand, 0.005 part of boron carbon nitrogen, 0.006 part of nano-montmorillonite, and 2.5 parts of deionized water.

[0053] In the present embodiment, the preparation method of photocatalytic cement mortar is carried out as follows:

[0054] Step 1: adding nano-montmorillonite to tap water, using a disperser to stir at a speed of 5500r / min for 40 minutes to obtain a film-attached liquid; the volume of the tap water is 0.52 times the volume of the machine-made sand;

[0055] Step 2: Stir the machine-made sand with a washing bucket for 5.5 minutes, put it on a mesh screen to dry for 30 minutes, and then place it in an oven to heat and dry; add the dried machine-made sand to the film-attached liquid and stir for 6 minutes, then Pour it into a tray and place it in an oven to heat and dry it, so that the nano-montmorillonite adheres to the surface of the ma...

Embodiment 3

[0060] In this embodiment, the raw material ratio of the cement mortar by weight is: 8 parts of cement, 25 parts of machine-made sand, 0.015 parts of boron carbon nitrogen, 0.011 parts of nano-montmorillonite, and 4.5 parts of deionized water.

[0061] In the present embodiment, the preparation method of photocatalytic cement mortar is carried out as follows:

[0062] Step 1: adding nano-montmorillonite to tap water, using a disperser to stir at a speed of 7000r / min for 30 minutes to obtain a film-attached liquid; the volume of the tap water is 0.6 times the volume of the machine-made sand;

[0063] Step 2: Stir the machine-made sand with a washing bucket for 6 minutes, put it on a mesh screen to dry for 35 minutes, and then place it in an oven to heat and dry; add the dried machine-made sand to the film-attached liquid and stir for 6.5 minutes, then Pour it into a tray and place it in an oven to heat and dry it, so that the nano-montmorillonite adheres to the surface of the m...

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Abstract

The invention relates to a boron, carbon and nitrogen-containing photocatalytic cement mortar and a preparation method thereof. The raw material ratio of the photocatalytic cement mortar includes 4 to 10 parts of cement, 10 to 35 parts of machine-made sand, and 0.004 to 0.004 parts of boron, carbon and nitrogen. 0.02 parts, 0.005-0.014 parts of nano-montmorillonite, 2-6 parts of deionized water; the preparation method is carried out as follows: Step 1: Prepare film-attaching liquid; Step 2: Attach film to the surface of machine-made sand; Step 3: Prepare solid mixed compound; step four: prepare boron carbon nitrogen dispersion liquid; step five: prepare photocatalytic cement mortar; the present invention adopts three-dimensional layered porous boron carbon nitrogen as the nano photocatalytic material of cement mortar, which can significantly improve degradation pollution under visible light irradiation The efficiency of the material; by adding boron, carbon and nitrogen into cement and water respectively, the dispersion of boron, carbon and nitrogen in cement mortar can be improved to ensure the effect of photocatalytic degradation of pollutants, and play a positive role in promoting the application of photocatalytic cement mortar .

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a photocatalytic cement mortar containing boron, carbon and nitrogen and a preparation method thereof. Background technique [0002] Cement mortar is an engineering material with strength after being mixed with cement, fine aggregate and water as the main raw materials. It is mainly used in masonry, plastering and decoration projects. Photocatalytic cement mortar is a composite material in which nano-photocatalytic materials are mixed in the process of preparing cement mortar to degrade pollutants under the action of sunlight. Photocatalytic cement mortar is mainly used in the surface of construction projects or pavement materials to purify the air. The application effect of photocatalytic cement mortar is directly affected by the properties of nano photocatalytic materials, the contact area with light source and the composite effect with cement and other materials. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B28/08C04B28/02C04B14/32B01J27/24C04B20/00
CPCC04B28/04C04B28/08C04B28/021C04B14/327B01J27/24C04B2111/00827B01J35/39C04B14/06C04B14/104C04B20/008C04B20/004
Inventor 王心晨杨政险阳灿卢林
Owner FUZHOU UNIV
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