Method for loading metal clusters on photocatalyst

Abstract

The invention relates to the field of photocatalysis, and provides a method for loading metal clusters on a photocatalyst. According to the method, no additive is needed, metal particles and photocatalyst particles are adopted as precursors, and the metal cluster loaded composite photocatalyst can be obtained under the hydrothermal condition after the metal particles and the photocatalyst particles are mixed. According to the method, the metal particles with large particle sizes are oxidized and etched by utilizing the oxidability of thermally induced holes of the photocatalyst, then metal atoms enter a solution, and metal ions grow on the particles in a heterogeneous nucleation manner under the reduction action of a hydrothermal condition to form the metal clusters. Compared with the prior art, the loading process provided by the invention is extremely simple, the size of the loaded metal clusters is less than 2 nm, the loaded metal clusters are uniformly distributed on photocatalyst particles, and the catalytic activity of the photocatalyst is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a method for loading metal clusters on a photocatalyst. Background technique [0002] Photocatalytic technology based on photocatalyst and solar energy is considered to be an effective way to solve the problems of global energy crisis and environmental pollution due to its clean and recyclable characteristics. However, there are two bottlenecks in photocatalysis technology. One is that most photocatalysts have low response to visible light, which is the main component of sunlight, and cannot effectively use sunlight; It is easy to compound and cannot be effectively utilized, resulting in a low level of photocatalytic efficiency. In the past nearly two decades of research, various approaches have been developed to address these two issues. Among them, loading metal particles on the catalyst as a co-catalyst is considered to be the most effective way to improve...

AI Technical Summary

Problems solved by technology

It is difficult to accurately control the loading of precious metals by using this method of impregnation and calcination, and during the calcination process, the crystal grains are prone to agglomeration, the particle size is large and the uniformity is poor, and the purpose of maximizing the catalytic activity with the least amount of precious metals cannot be achieved.

[0004] Generally, the chemical reduction method is used to load noble metal particles on the photocatalyst particles. In this type of reduction process, the metal salt precursor must be reduced while protecting the photocatalyst from damage. Therefore, various protective agents are required in the process. After the reaction is completed It is difficult to completely remove the post-reductant and protective agent

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