High-activity graphite-phase carbon nitride material and preparation method thereof

Abstract

The invention belongs to the technical field of material preparation and photocatalysis, and discloses a high-activity graphite-phase carbon nitride material and a preparation method thereof. The preparation method comprises the following steps: forming a self-generated gas atmosphere a gas generated from a precursor by pyrolysis in the high-temperature calcining process under the control on an inert gas, and guiding synthesis of a carbon nitride material, thereby obtaining a flaky porous graphite-phase carbon nitride material. According to the preparation method, after the inert gas is not introduced any longer, a self-generated gas generated from the precursor is relatively uniform at different parts, and the carbon nitride material prepared with the preparation method is uniform in morphology and relatively good in crystal form; due to the escape of the self-generated gas, the material is effectively pored, and thus the specific surface area and the active sites of the material are increased; due to the self-generated gas atmosphere, the polymerization degree of the precursor is reduced, and the obtained carbon nitride material has a relatively large amount of unpolymerized amino or imino groups. The preparation method disclosed by the invention is simple, efficient and low in cost, and the carbon nitride material prepared with the preparation method is excellent in photocatalysis activity and very good in practicability.

Description

technical field [0001] The invention belongs to the technical field of material preparation and photocatalysis, and in particular relates to a highly active graphite phase carbon nitride material and a preparation method thereof. Background technique [0002] Environmental pollution and energy shortage are two major problems facing mankind at present, and photocatalytic technology can use solar energy to effectively degrade pollutants in water bodies, and its development has far-reaching significance for alleviating and synergistically solving these two problems. The core of photocatalytic technology is to design and develop a cheap, easy-to-obtain, efficient and stable photocatalyst. In recent years, non-metal semiconducting polymer graphitic carbon nitride photocatalysts have attracted extensive attention. This material has many outstanding advantages: (1) narrow bandgap width, capable of responding to visible light; (2) high thermodynamic and chemical stability; (3) wide...

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Problems solved by technology

[0004] To sum up, the problems existing in the prior art are: it is difficult to effectively control the preparation process of bulk graphite phase carbon nitride prepared by the conventional high-temperature thermal polymerization method, and the obtained product has poor uniformity, severe stacking, small specific surface area, and empty space for photogenerated electrons. Holes are easy to recombine, resulting in low efficiency of photocatalytic degradation of pollutants; in the preparation of graphite phase carbon nitride materials, as far as they are concerned, there are many factors that can affect its chemical structure to obtain materials with unique properties , such as selecting different reaction precursors, controlling different reaction temperatures, changing the duration of thermal polymerization, etc.

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