Spherical mesoporous carbon nitride photocatalyst with multistage nano structure

Abstract

The invention discloses a spherical mesoporous carbon nitride photocatalyst with a multistage nano structure and a preparation method and application thereof and belongs to the technical field of material preparation and photocatalysis. The spherical mesoporous carbon nitride photocatalyst with the multistage nano structure is prepared by using cyanamide as a precursor, using spherical mesoporous silicon dioxide with a highly open structure as a hard template, carrying out thermal thermal polymerization and removing the hard template. The spherical mesoporous carbon nitride prepared by the preparation method has the characteristic that nanosheet or nanosheet-like small particles are uniformly diffused around from the sphere center to form a spherical micro nano structure of which the surface structure is highly open; compared with conventional bulk phase carbon nitride, the spherical mesoporous carbon nitride photocatalyst can obviously improve the specific surface area and the mass transfer effect and has efficient photocatalytic hydrogen production performance in the visible light. The spherical mesoporous carbon nitride photocatalyst adopts a simple synthetic process, has high catalysis efficiency and has wide application prospect in the field of catalysis / photocatalysis.

Description

technical field [0001] The invention belongs to the technical field of material preparation and photocatalysis, and in particular relates to a spherical mesoporous carbon nitride photocatalyst with a multi-level nanostructure and its preparation method and application. Background technique [0002] Energy is the material basis of human activities, and the development of human society is inseparable from the application and development of high-quality energy. Semiconductor photocatalysis technology, by using sunlight to drive chemical reactions, such as photocatalytic water splitting to produce hydrogen (Chem. Rev. 2010, 110, 6503), CO 2 Fixed reduction (Chem. Rev. 2001, 101, 953), selective organic redox reaction, pollutant degradation and mineralization (Chem. Rev. 1995, 95, 69), etc., convert low-density solar energy into high-density Chemical energy has broad application prospects in solving energy and environmental problems. At present, hundreds of photocatalytic mater...

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Problems solved by technology

However, at present, the surface structure of these traditional mesoporous carbon nitride nanomaterials is still relatively "closed", which cannot effectively promote the mass transfer and diffusion of reaction substrates in nanopores, and it is difficult to give full play to the special physical and chemical properties of polymer semiconductors to overcome polymer The purpose of the disadvantages of low photogenerated carrier mobility and serious recombination in semiconductors

For example, the hollow spherical carbon nitride with the highest photolysis efficiency at present, the nanopores on the wall will collapse when the template agent is removed, which hinders the chemical reaction on the inner surface, which is not conducive to the efficient progress of the photocatalytic reaction.

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