Amorphous TiO2/Ag composite nanoparticles as well as preparation method and application thereof

Abstract

The invention relates to amorphous TiO2 / Ag composite nanoparticles as well as a preparation method and application thereof. The method comprises the following following steps: (1) preparing a titanium dioxide solution: dissolving a dispersant into a solvent, dropwise adding a titanium source and deionized water, and stirring to obtain a solution A; (2) preparing a silver nano solution: adding fructose and a silver source into a solvent, and stirring until the fructose and the silver source are completely dissolved to obtain a solution B; and (3) preparing the amorphous TiO2 / Ag composite nano-particles: mixing the solution A and the solution B, illuminating to obtain a product solution, centrifugally washing and drying to obtain the amorphous TiO2 / Ag composite nano-particles, and applying the composite nano-particles to photoelectrocatalysis. Compared with the prior art, the method has the advantages of simplicity, rapidness, high yield and the like.

Description

technical field [0001] The invention relates to the technical field of functional nanomaterials, in particular to an amorphous TiO 2 / Ag composite nanoparticle and its preparation method and application. Background technique [0002] Titanium dioxide is one of the most studied compounds in materials science. It is a semiconductor material with extremely low cost, strong chemical inertness and good photostability. Because of its good physical and chemical properties, it has become one of the most promising materials in terms of "energy" and "environment", and is widely used in photocatalytic hydrogen production, photocatalytic carbon dioxide reduction, bacterial inactivation, dye degradation, etc. Among them, semiconductor photocatalysis technology is the most widely used. Solar energy is used as an excitation source, and titanium dioxide produces photoelectron-hole pairs, photogenerated electrons have high reducibility, and hole pairs have strong oxidative properties. Li...

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Problems solved by technology

Similarly, titanium dioxide as a photocatalytic material also has significant disadvantages

The photoresponse range of titanium dioxide material is narrow, and the utilization rate of light is low; the band gap is too wide, and the excitation is difficult; the photogenerated electron-hole pairs are easy to recombine, reducing the catalytic activity and other problems are current research problems.

The amorphous titanium dioxide prepared by CN 109529872A has a high specific surface area, but the problem of the forbidden band width has not been overcome, and it is necessary to improve the utilization rate of solar energy through the bandgap coupling and complementary interaction with different nanoparticles

[0005] Many of the above preparation methods and ideas have fully considered the improvement of the photocatalytic performance of noble metal deposition and amorphous titanium dioxide, but most of the experimental methods have low yields, high equipment requirements, and complicated processes, which are not suitable for large-scale production.

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