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A high-efficiency multi-purpose photocatalytic concrete

A photocatalytic and concrete technology, applied in the field of photocatalytic cement-based materials, can solve the problems of TiO2 peeling, reducing the specific surface area of ​​photocatalytic action, and no positive promotion effect, so as to improve photocatalytic performance, good market application prospects, The effect of improving the photocatalytic efficiency

Active Publication Date: 2021-05-07
SICHUAN COLLEGE OF ARCHITECTURAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, photocatalytic building materials have gradually played an important role in the field of environmental purification from scratch, and the preparation technology of photocatalytic building materials is also being continuously improved, but the current photocatalytic building materials still have the following problems , which limits its application: ① The highly alkaline environment of cement-based materials is harmful to TiO 2 ② The cement-based material itself is relatively dense and has a small specific surface area, so it has no positive effect on a reaction in which adsorption is dominant; ③ However, the method of directly mixing nano-TiO into cement 2 The loading method of the powder will cause the cement hydration products to wrap the nanoparticles, and the nanoparticles are easy to agglomerate and difficult to disperse in the environment with water, which reduces the specific surface area of ​​photocatalysis and reduces the photocatalysis efficiency; ④Secondly, there is no Nano-TiO encapsulated by cement hydration products 2 The combination with cement-based materials is mainly based on van der Mana, and the binding force is poor, which is a weak connection. After repeated use, TiO2 will appear. 2 peeling phenomenon, reducing its durability

Method used

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  • A high-efficiency multi-purpose photocatalytic concrete
  • A high-efficiency multi-purpose photocatalytic concrete
  • A high-efficiency multi-purpose photocatalytic concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A high-efficiency multi-purpose photocatalytic concrete, mainly including 1wt% photocatalytic aggregate, the photocatalytic aggregate is loaded with photocatalyst TiO 2 .

[0037] A preparation method of high-efficiency multi-purpose photocatalytic concrete mainly includes the following steps:

[0038] Step A1: Select natural zeolite with a particle size of 1-2cm, wash the sediment, dry, and weigh 500g for later use; weigh 10g butyl titanate, 80g deionized water, and 0.8g nitric acid; add all the nitric acid to deionized In water, then add butyl titanate drop by drop at a rate of 2-3 drops / second, stir while adding dropwise, and obtain a milky white suspension after the dropwise addition; place the milky white suspension in a water bath at 50°C Stir the reaction for 24 hours, and finally get light blue TiO 2 Sol;

[0039] Step A2: Pour 500g of natural zeolite into TiO 2 Stir in the sol for 45 minutes, then ultrasonically disperse for 1 hour, and place it in a vacuum...

Embodiment 2

[0047] A high-efficiency and multi-purpose photocatalytic concrete mainly includes 5wt% photocatalytic aggregate, and the photocatalytic aggregate is loaded with photocatalyst TiO 2 .

[0048] A preparation method of high-efficiency multi-purpose photocatalytic concrete mainly includes the following steps:

[0049] Step A1: Select natural zeolite with a particle size of 1-2cm, wash the sediment, dry, and weigh 500g for later use; weigh 10g butyl titanate, 80g deionized water, and 0.8g nitric acid; add all the nitric acid to deionized In water, then add butyl titanate drop by drop at a rate of 2-3 drops / second, stir while adding dropwise, and obtain a milky white suspension after the dropwise addition; place the milky white suspension in a water bath at 50°C Stir the reaction for 24 hours, and finally get light blue TiO 2 Sol;

[0050] Step A2: Pour 500g of natural zeolite into TiO 2 Stir in the sol for 45 minutes, then ultrasonically disperse for 1 hour, and place it in a ...

Embodiment 3

[0058] A high-efficiency multi-purpose photocatalytic concrete, mainly including 10wt% photocatalytic aggregate, the photocatalytic aggregate is loaded with photocatalyst TiO 2 .

[0059] A preparation method of high-efficiency multi-purpose photocatalytic concrete mainly includes the following steps:

[0060] Step A1: Select natural zeolite with a particle size of 1-2cm, wash the sediment, dry, and weigh 500g for later use; weigh 10g butyl titanate, 80g deionized water, and 0.8g nitric acid; add all the nitric acid to deionized In water, then add butyl titanate drop by drop at a rate of 2-3 drops / second, stir while adding dropwise, and obtain a milky white suspension after the dropwise addition; place the milky white suspension in a water bath at 50°C Stir the reaction for 24 hours, and finally get light blue TiO 2 Sol;

[0061] Step A2: Pour 500g of natural zeolite into TiO 2 Stir in the sol for 45 minutes, then ultrasonically disperse for 1 hour, and place it in a vacuu...

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Abstract

The invention discloses a high-efficiency multipurpose photocatalytic concrete. The photocatalytic concrete mainly includes 5wt%-10wt% photocatalytic aggregate. The invention prepares photocatalytic concrete by doping photocatalytic aggregate in concrete, effectively reducing the Alkaline destruction of TiO in cement 2 The catalytic efficiency can effectively improve the catalytic efficiency and service life of photocatalytic building cement. The present invention adopts sol-gel method to prepare TiO 2 Water sol, using negative pressure-saturation method to impregnate the aggregate, and preparing photocatalytic aggregate after calcination; the preparation method of the present invention avoids TiO 2 Nanoparticles agglomerate, making TiO 2 The particles are evenly dispersed in the aggregate, which increases the specific surface area of ​​photocatalysis, thereby effectively improving the photocatalysis efficiency; the present invention prepares photocatalytic aggregate after calcination, so that TiO 2 Produce chemical bonds on the surface of the aggregate to enhance the bonding force and improve durability.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic cement-based materials, and in particular relates to a high-efficiency multipurpose photocatalytic concrete. Background technique [0002] with TiO 2 The representative photocatalytic material has super strong catalytic oxidation function, and has been widely used in environmental purification since its birth. Building materials represented by cement concrete are used in large quantities and in a wide range of applications, and are ideal carriers for photocatalytic materials in the field of environmental purification. In recent years, photocatalytic building materials have gradually played an important role in the field of environmental purification from scratch, and the preparation technology of photocatalytic building materials is also being continuously improved, but the current photocatalytic building materials still have the following problems , which limits its application: ① The hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B20/10C04B20/04
CPCC04B20/04C04B20/1066C04B28/00C04B2111/00017C04B2111/00025C04B2111/00827C04B14/047C04B14/02
Inventor 廖刚
Owner SICHUAN COLLEGE OF ARCHITECTURAL TECH