Quantum dot/TiO2 nano-composite hydrogel soft reactor and in-situ radiation preparation method thereof

Abstract

The invention discloses a quantum dot / TiO2 nano-composite hydrogel soft reactor and an in-situ radiation preparation method thereof. According to the in-situ radiation preparation method, physically crosslinked TiO2 composite hydrogel utilizing natural polysaccharides as a base material is prepared by virtue of cycle freezing, and after a quantum dot precursor and TiO2 nano-composite hydrogel are blended, quantum dots prepared through in-situ radiation of electron beams can be uniformly assembled to the surface of nano-TiO2 to effectively modify and sensitize the surface of nano-TiO2, so as to form a hydrogel 'soft reactor' catalytic material in which a quantum dot / TiO2 composite is effectively loaded into a hydrogel skeleton. Due to the organic unification of adsorption, photocatalysis, antibiosis and sterilization, the hydrogel soft reactor which is excellent in mechanical strength, high in expansion response speed and shrinkage response speed, capable of easily loading catalysts and stable in performance can be obtained. The quantum dot / TiO2 nano-composite hydrogel 'soft reactor'catalytic material prepared by virtue of the in-situ radiation preparation method can be widely popularized and applied to the fields of environmental sewage treatment, photocatalysis, antibiosis, sterilization and the like.

Description

technical field [0001] The present invention relates to a quantum dot / TiO 2 A nanocomposite hydrogel soft reactor and an in-situ radiation preparation method thereof, particularly a method for in-situ preparation of quantum dots by ionizing radiation and effectively modifying a nano-TiO2 composite hydrogel "soft reactor". Background technique [0002] Nano TiO 2 Semiconductor oxides have attracted great attention in the field of photocatalytic reactions. When TiO 2 After the semiconductor absorbs light energy with energy greater than the forbidden band width, the electrons in the valence band are excited to the conduction band, and electron-hole pairs are generated. , Photoorganic synthesis, etc. Nano TiO 2 Small particle size, large specific surface, high surface energy, nanoparticles are easy to agglomerate; on the other hand, nano-TiO 2 The affinity with the matrix with low surface energy ratio is poor, and the two cannot be miscible when they are mixed with each ot...

AI Technical Summary

Problems solved by technology

However, the hydrogel prepared by this method is not only easy to release the residual highly toxic cross-linking agent and reducing agent in the water body, but also has uneven cross-linking, local "burning phenomenon", and it is difficult to control the degree of cross-linking by chemical cross-linking. Secondly, the quantum dots prepared by the chemical reduction method not only cannot be uniformly distributed in the gel bone glue system, but also the force between them and the gel molecules is too weak or even non-existent, which makes it easy to lose from the gel pores, thus affecting the hydrogel. Catalytic stability restricts the application of hydrogels as multifunctional materials