Environment-friendly artificial aggregate capable of degrading gas pollutants by photocatalysis and preparation method of environment-friendly artificial aggregate

Abstract

The invention relates to an environment-friendly artificial aggregate capable of degrading gas pollutants by photocatalysis and a preparation method of the environment-friendly artificial aggregate. The gas pollutant degrading aggregate is composed of a base material core and a photocatalysis aggregate coating layer. The production formula of the environment-friendly artificial aggregate includes a base material, photocatalysis aggregate coating pulp, organic dispersing agent and the like; the key components include a photocatalyst, functional additives (stabilizing additives, modifying additives, decorative additives), and the like. The preparation method of the environment-friendly artificial aggregate comprises the following steps of: (1), preparing base material particles; (2), preparing photocatalysis aggregate coating pulp; (3), packaging the surfaces of the base material particles; and (4), roasting and preserving the heat. The environment-friendly artificial aggregate is strong in practicability, energy-saving and environment-friendly and high in operability of the implementation method. The product is good in mechanical performances, safe and non-toxic, corrosion resistant, free of secondary pollution, capable of degrading and purifying main harmful substances of the gas pollutant under the excitation of natural light and efficient and lasting in purifying capacity. Besides, the environment-friendly artificial aggregate can be used as the material for being extensively applied to constructing the facilities including a road, a building, an ornament and the like rich in gas pollutants.

Description

technical field [0001] The invention belongs to the field of environment-friendly materials, and in particular relates to an environment-friendly artificial aggregate capable of degrading gas pollutants through photocatalysis and a preparation method thereof. Background technique [0002] With the rapid development of the global economy, the problem of air pollution caused by gas pollutants emitted in the process of industrial production, automobile driving, and building decoration has become increasingly serious. [0003] The main components of gas pollutants include CO (carbon monoxide), NO x (nitrogen oxides, especially NO and NO 2 ), SO x (SO 2 Sulfur dioxide, SO 1 Sulfur monoxide), HS (hydrogen sulfide), incompletely combusted HC (hydrocarbons), particulate matter PM, etc. Pollution gases contribute to the greenhouse effect, acid rain and urban photochemical smog, and deposit harmful substances in the soil. Most gas pollutants are toxic, and have carcinogenic, ter...

AI Technical Summary

Problems solved by technology

This type of method makes the photocatalyst powder almost completely dispersed and wrapped in the cement matrix, and it is difficult for the photocatalyst to fully contact with the gas pollutants, resulting in low degradation efficiency of the photocatalyst

At the same time, similar to sprayed products, with the wear of the road structure surface, a large amount of aggregate is exposed, and the contact surface between the photocatalyst and the polluted gas and excitation energy (sunlight) will be further reduced, which will seriously hinder the photocatalytic reaction and reduce gas pollution. degradation rate

[0008]In addition, unmodified TiO2 and other photocatalysts are mostly used alone in the prior art, and there are still the following disadvantages: the catalyst can only Utilizing the ultraviolet part which accounts for 4% of the solar spectrum range, the spectral response range is narrow, and the effective utilization rate of solar energy is low; the immobilization conditions of TiO2 are harsh, and it is difficult to maintain high catalytic activity while satisfying Under the premise of specific material physical and chemical performance requirements, evenly and firmly load on the surface of different materials

However, the modification of photocatalytic materials by doping rare earth materials requires high-temperature calcination and long-term reaction, so the preparation of modified TiO2, Bi2O 3 and other photocatalysts consume a lot of energy, and the economic cost is too high, so it is not easy to promote

[0010] In addition to the above technologies, so far there is no road, building aggregate products and preparation technologies related to the degradation of gaseous pollutants