A preparation method of uniformly dispersed photocatalytic hydrogel

Abstract

The invention discloses a preparation method of a homodisperse photocatalytic hydrogel. The method includes: adding core-shell photocatalytic nanoparticles into hydrogel, then adding potassium persulfate and N, N-methylene bisacrylamide to prepare the composite hydrogel with photocatalytic effect under a UV irradiation condition. The method provided by the invention can prepare porous reticulatedhydrogel, which has the characteristics of uniform network, good dispersibility of nanoparticles, and excellent ability of photocatalytic degradation of pollutants. The preparation process is simple,the conditions are easily controllable, and the method is convenient for industrial application. The prepared hydrogel can effectively degrade formaldehyde, benzene, toluene, xylene, ammonia, TVOC andother pollutants, and has efficient and extensive disinfection properties.

Description

technical field [0001] The invention relates to a method for preparing a hydrogel, and more specifically, relates to a method for preparing a uniformly dispersed photocatalytic hydrogel. Background technique [0002] Hydrogel is a part of hydrophobic groups and hydrophilic residues introduced into the water-soluble polymer with network cross-linked structure. The hydrophilic residues combine with water molecules to connect the water molecules inside the network, while the hydrophobic residues Water-swellable cross-linked polymers are soft in nature, can maintain a certain shape, and can absorb a large amount of water. At present, artificially synthesized hydrogels usually have disadvantages such as low gel strength, poor toughness, and slow water absorption speed, which cannot meet the requirements. According to the requirements of use, researchers have carried out a lot of research work on improving the mechanical properties of hydrogels, and developed several new types of ...

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Problems solved by technology

[0002] Hydrogel is a part of hydrophobic groups and hydrophilic residues introduced into the water-soluble polymer with network cross-linked structure. The hydrophilic residues combine with water molecules to connect the water molecules inside the network, while the hydrophobic residues Water-swellable cross-linked polymers are soft in nature, can maintain a certain shape, and can absorb a large amount of water. At present, artificially synthesized hydrogels usually have disadvantages such as low gel strength, poor toughness, and slow water absorption speed, which cannot meet the requirements. According to the requirements of use, researchers have carried out a lot of research work on improving the mechanical properties of hydrogels, and developed several new types of gels with excellent mechanical properties, such as topological hydrogels, double-network hydrogels, and composite water gels. Gels, macromolecular microsphere composite hydrogels, hydrophobic association gels, and uniform chain structure hydrogels, etc. Among them, composite hydrogels have attracted extensive attention due to their high strength and diverse composite methods. In the preparation of hydrogel, it is difficult to disperse the inorganic nanoparticles uniformly into the organic polymer network. This is because the nanoparticles have a large interfacial free energy, which makes the particles easy to agglomerate. It is difficult to eliminate the inorganic nanoparticles by general stirring. There is a high interfacial energy difference between the particles and the polymer matrix, and there are also defects such as complicated process operation and difficult preparation through chemical methods

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