A nitrogen-doped graphite-like carbon nitride visible light catalyst and its preparation method and application

Abstract

The invention discloses a nitrogen-doped graphite-like phase carbon nitride visible light catalyst as well as a preparation method and application thereof. The method adopts the preparation method of thermal stripping-solvothermal combination, and the synthesized N-g-C 3 N 4 Has excellent photocatalytic properties. In this method, melamine is used as raw material, and organic solvents such as N,N-dimethylacetamide are commonly used to synthesize N-g-C by solvothermal reaction. 3 N 4 Photocatalyst has the advantages of simple operation, readily available raw materials, no additives, low cost, mild application conditions, and environmental friendliness. It provides a reference scheme for nitrogen atom doping. N-g-C of the present invention 3 N 4 The photocatalyst has excellent performance and good stability, and has great application potential in the photocatalytic degradation of organic pollutants. The photocatalytic degradation efficiency of rhodamine B and other organic dyes under visible light can reach more than 95%.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, in particular to a nitrogen-doped graphite-like carbon nitride (N-g-C 3 N 4 ) Visible light catalyst and its preparation method and application. Background technique [0002] Photocatalytic technology uses semiconductor materials as the catalyst carrier and uses a steady stream of sunlight as the light source. It has the advantages of high energy utilization rate, low energy consumption, and wide application range. It is one of the hot research fields for environmental pollution control today. [0003] Carbon nitride (g-C 3 N 4 ) as a metal-free visible light photocatalyst exhibits excellent stability, and also has the advantages of adjustable composition and flexible and adjustable energy band position. However, the current g-C 3 N 4 , there are problems such as small specific surface area and low energy utilization efficiency of visible light, which limit its application in photoca...

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Problems solved by technology

Because it is difficult to remove completely, the purity of nanomaterials is not high, and there is a certain waste of resources (see Energy&Fuels 2006, 20, 1275-1280); using dimethylformamide as a solvothermal reaction solvent, it can be used in g-C 3 N 4 The surface is doped with a nitrogen source, but dimethylformamide, as a commonly used high-temperature solvothermal reaction solvent, has stable chemical properties and cannot provide sufficient nitrogen source under high temperature conditions, resulting in the nitrogen doping on the surface only forming N-H bonds. Poor activity (see Applied Surface Science, 2018, 459, 845-852)

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