Covalent triazine organic framework composite photocatalyst with surface confinement monodisperse Pt nanoparticles as well as preparation method and application of covalent triazine organic framework composite photocatalyst

Abstract

The invention discloses a covalent triazine organic framework composite photocatalyst with surface confinement monodisperse Pt nanoparticles as well as a preparation method and application of the covalent triazine organic framework composite photocatalyst, and belongs to the technical field of material preparation and photocatalysis. According to the preparation method, a covalent triazine organicframework is used as a carrier, residual cyano groups in the covalent triazine organic framework are converted into scaffold carboxyl through alkaline hydrolysis, Pt nanoparticles are anchored to thescaffold carboxyl through a photodeposition method, and the covalent triazine organic framework composite photocatalyst Pt-CTF-COOH with the surface confinement monodisperse Pt nanoparticles is prepared. According to the method, carboxyl functionalization is carried out on a covalent triazine organic framework, Pt is immobilized on a carboxyl support, monodispersion of Pt nanoparticles is achieved, and the efficiency of photocatalytic decomposition of water into hydrogen is effectively improved. The photocatalyst is good in stability and long in service life, the synthesis method is simple and convenient, the problems that in the prior art, a photocatalyst preparation process is tedious, poor in stability and the like are solved, the actual production requirement is met, and great application potential is achieved.

Description

technical field [0001] The invention belongs to the technical field of material preparation and photocatalysis, and in particular relates to a covalent triazine organic framework composite photocatalyst with surface-confined monodisperse Pt nanoparticles, a preparation method and application thereof. Background technique [0002] Photocatalytic water splitting for hydrogen production is a clean hydrogen energy production technology, which provides a new way for solar energy conversion, and the key to efficient photocatalytic water splitting for hydrogen production lies in the rational design of photocatalysts. Since the discovery of TiO in 1972 2 Since Pt can realize photocatalytic water splitting to produce hydrogen, a large number of photocatalysts have been designed and synthesized. From the analysis of the energy band structure, although these photocatalysts meet the requirements of splitting water to produce hydrogen, due to their low surface work function and poor hyd...

AI Technical Summary

Problems solved by technology

However, in most current photocatalytic water splitting hydrogen production systems, cocatalysts are simply supported on the surface of photocatalysts through weak electrostatic adsorption or van der Waals forces.

Although the photocatalytic activity of the obtained composite photocatalyst has been improved to a certain extent, due to the weak interaction, the composite photocatalyst is often unstable, and the surface co-catalyst is easy to aggregate and leach.

In addition, the weak interaction also greatly limits the high charge transfer between photocatalyst and cocatalyst

These deficiencies, coupled with the randomly distributed morphology of the co-catalysts, make the overall catalytic effect of the composite photocatalytic system unsatisfactory.

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