Surface spouting photocatalytic material enrichment method based on magnetic attraction

Abstract

The invention provides a surface spouting photocatalytic material enrichment method based on magnetic attraction. The method comprises the following steps: (1) preparing a hydrophilic magnetic composite nanometer photocatalyst with high-efficiency photocatalytic degradation performance; (2) preparing building surface spouting liquid containing the magnetic composite nanometer photocatalyst; (3) performing building surface pretreatment; (4) building surface slurry spraying; (5) performing magnetic attraction enrichment on a photocatalytic material in the surface spraying slurry; (6) spouting liquid curing. The hydrophilic magnetic composite nanometer photocatalyst is enriched on the coating surface under the effect of magnetic attraction of an applied magnetic field, a photocatalytic surface with high density, high abundance and high exposure area is formed, the material has strong adsorption and photocatalytic degradation performance on toxic pollutants, and environmental pollutants are efficiently removed at low consumption.

Description

technical field [0001] The invention relates to a method for enriching surface sprayed photocatalytic materials based on magnetic traction, and belongs to the technical field of preparation of decontamination materials. Background technique [0002] With the rapid development of economy and society, toxic and harmful pollutants from industrial and agricultural production seriously threaten the environment and human health. It is of great significance to seek a new and efficient environmental governance technology; photocatalytic technology is highly efficient, safe and , energy saving, environmental friendliness, complete degradation of pollutants, and natural light can be induced, etc., has become an emerging environmental governance technology with important application prospects. [0003] At present, methods such as internal mixing, external mixing, and surface coating are usually used in the preparation of photocatalytic building materials; the internal mixing method put...

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Problems solved by technology

[0003] At present, methods such as internal mixing, external mixing, and surface coating are usually used in the preparation of photocatalytic building materials; the internal mixing method puts a large amount of nanomaterials (usually at a concentration of 2%-8%) in the mixing water, and adds pre-mixed sand and cement In the mixture, because a large amount of nanomaterials are deposited inside the building materials, it is difficult to be exposed to light, and only a small amount of nanomaterials are attached to the surface of the building materials to participate in the photocatalytic reaction. The loss of nanomaterials is large and the reaction efficiency is low.

The nanomaterials are directly coated on the surface of building materials by the external mixing method, and the nanomaterials are easy to lose and fall off. The nanomaterials lost to the environment will have a potential impact on the environment, and the photocatalytic degradation performance will also be significantly affected; The material is bonded and fixed to the surface of the material, but there are a series of technical problems such as difficult control of the thickness of the coating, easy cracking and falling off of the coating, difficult repair and self-healing, and difficult fastening; in the process of preparing nanocomposites, how to improve the adhesion of nanoparticles on the surface of the material Exposure density, concentration and binding strength, thereby increasing the contact area with light and enhancing the photocatalytic degradation efficiency are current research hotspots and key technical bottlenecks