Large-specific surface area graphite-phase carbonitride photocatalyst and application thereof in photocatalytic degradation reaction of TCP and photocatalysis reaction for hydrogen production

Abstract

The invention belongs to the field of a semiconductor photocatalysis technology and specifically relates to a large-specific surface area graphite-phase carbonitride photocatalyst and its application in the photocatalytic degradation reaction of TCP and the photocatalysis reaction for hydrogen production. By a dielectric barrier discharge plasma generator, N2 is used as a discharge gas to discharge catalyst precursors such as melamine, dicyandiamide, urea and the like so as to carry out polycondensation on the precursors. The photocatalyst provided by the invention has advantages of simple operation, short consumed time, low energy consumption, high product catalyst activity, good stability and the like. As the catalyst prepared by the method has larger specific surface area, stronger visible light absorption capacity and higher electron-hole separating efficiency, the catalyst has strong catalytic degradation ability of organic pollutants and photocatalytic decomposition ability of water for hydrogen production under visible light illumination. The catalyst provided by the invention is used in the photocatalytic degradation process of TCP and the photocatalytic decomposition process of water for hydrogen production.

Description

technical field [0001] The invention belongs to the technical field of semiconductor photocatalysis, and in particular relates to a graphite-phase carbon nitride photocatalyst with a large specific surface area and its application in photocatalytic degradation of TCP reaction and photocatalytic hydrogen production reaction. Background technique [0002] Since the discovery of n-type TiO by Fujishima and Honda et al. 2 Since the phenomenon of hydrogen production by photo-induced splitting of water on semiconductor electrodes, heterogeneous photocatalytic technology has attracted the attention of many scholars in the fields of physics, chemistry, environmental protection, and materials. However, as a new environmentally friendly process technology, there are still two key scientific problems that have not been properly resolved: (1) Most semiconductor catalysts have a wide energy band and can only be excited by ultraviolet light, while sunlight reaching the ground Ultraviolet...

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Problems solved by technology

This method consumes a lot of energy, takes a long time, and the specific surface area of ​​the product g-C3N4 is small, so the photocatalytic performance is often not very ideal

For example, adding a template agent (SiO2 microspheres, etc.) during the polycondensation process can increase the specific surface area and thus improve the photocatalytic performance [Chem. Mater., 2009, 21, 4093-4095; J. Am. Chem. Soc., 2009, 131, 1680-1681.], however, this method has many steps and the preparation is relatively complicated

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