Pre-radiation synthesis method for recycling-free natural polysaccharide hydrogel-base photocatalyst

Abstract

The invention provides a pre-radiation synthesis method for a recycling-free natural polysaccharide hydrogel-base photocatalyst, which belongs to the technical field of nuclear biology, and solves thetechnical problems that natural polysaccharide hydrogel-base photocatalyst prepared by virtue of existing methods is low in photocatalytic efficiency, difficult to recycle, poor in mechanical property and the like. The method comprises the following steps: mixing the main base materials including natural polysaccharide, an irradiation sensitizing agent, a pH adjuster, a nano-photocatalyst and thelike so as to form stable dispersion liquid, and carrying out circular freezing-unfreezing, so as to prepare a first-layer network structure of hydrogel; and preparing a prepolymer solution from low-dose pre-radiation monomers, enabling the prepolymer solution to infiltrate into the first-layer network structure of hydrogel, carrying out radiation crosslinking again on an obtained sample so as toobtain a second-layer network structure of hydrogel, so as to obtain the polymer, namely the dual-network recycling-free natural polysaccharide hydrogel-base photocatalyst. The method has the advantages of high photocatalytic efficiency, degradability, high strength, low cost and the like and does not need to be recycled.

Description

technical field [0001] The invention belongs to the technical field of nuclear biology, and relates to a pre-radiation synthesis method of a recovery-free natural polysaccharide hydrogel-based photocatalyst. Background technique [0002] Hydrogel is a three-dimensional interpenetrating network structure between liquid and solid. It is a hydrophilic polymer gel that can significantly swell in water but cannot be dissolved in water. Although hydrogel contains a lot of water, But it can show a certain shape like a solid. In particular, the double-network structure high-strength smart hydrogel based on natural polysaccharides is one of the key points and frontiers of polymer science research, and has extremely important research and development in medicine, catalysis, antibacterial, environmental protection and related fields. Value. [0003] Although various methods have been used to prepare hydrogels with different compositions, structures and properties, there are still som...

AI Technical Summary

Problems solved by technology

[0004] Due to the ubiquitous problems of hydrogel properties, the uniformity of the network structure is insufficient, and the stress is poor.

The inhomogeneity of the network structure is one of the key factors causing the low mechanical properties of traditional hydrogels. Hydrogels crosslinked by traditional chemical crosslinking agents may have inhomogeneity in the network structure during the preparation process, resulting in low gel strength. , brittle

Therefore, when an external force is applied, the distribution of stress in the network is not uniform, and the polymer chains are easily broken in the stress concentration area to form tiny cracks, and then the stress propagates along the cracks, eventually leading to hydrogel damage.