A kind of preparation method of doped graphitic carbon nitride material

Abstract

The invention discloses a method for preparing doped graphite-like carbon nitride materials; using metal organic matter with sublimation or low boiling point characteristics (such as acetylacetone complex, bis(2,2,6,6-tetramethyl-3 , 5-heptanedione) copper, bis(hexafluoroacetylacetonate) copper, ferrocene, copper formate, metal carbonyl compound) in the polycondensation process of graphite carbon nitride nitrogen-rich precursor, metal ions and anions gas phase Co-doping control; during the heating and polycondensation process, the precursors of metal organic salts and graphite carbon nitride are partitioned, the control pressure is 0.1-20MPa, the heating rate is 1-30℃ / min, and the temperature is maintained at 450-600℃ for 2- 6h, the graphite carbon nitride is obtained. This method is based on a gas-phase co-doping method, which can efficiently and quickly obtain doped graphite-like carbon nitride with a hierarchical pore structure; the obtained material is highly active in the photocatalytic decomposition of water and the catalytic degradation of organic matter.

Description

technical field [0001] The present invention relates to the preparation of graphite-phase carbon nitride, in particular to a one-step preparation method for gas-phase doping of metal-organic salts based on sublimation characteristics and regulation and control of modified graphite-like carbon nitride materials, which is used for photocatalytic technology to decompose water to produce hydrogen, Photocatalytic decomposition of organic pollutants such as VOC, S-VOC in the field. Background technique [0002] In today's society, among the many ways to seek renewable energy, photocatalytic technology is considered to be one of the most promising technologies for converting sunlight energy into hydrogen energy, and it also provides a feasible idea for solving environmental problems. Graphite carbon nitride, as a non-metallic n-type semiconductor polymer, has many excellent electrical, optical and physicochemical properties. Photocatalysts based on graphitic carbon nitride have at...

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Problems solved by technology

[0004] However, the graphitic carbon nitride material prepared by traditional pyrolysis of nitrogen-rich organic matter has a small specific surface area, low photocatalytic activity, and almost no photocatalytic activity in the near-infrared region.

[0005] However, the existing methods for preparing doped and modified graphitic carbon nitride materials often have complicated steps, and it is difficult to realize the co-doping control of metal cations and anions, which limits the doping and modification of graphitic carbon nitride materials. Material properties

For example, the bimetallic ion-doped graphitic carbon nitride material mentioned in the patent CN105214709B requires a series of complex steps such as dissolving, stirring, drying, grinding and mixing, and fails to realize the co-doping regulation of metal cations and anions

Another example is the preparation method of inorganic ion-doped carbon nitride photocatalyst mentioned in the patent CN103301867A. The preparation process is also relatively cumbersome, and only the doping of specific ions is considered, and the co-doping regulation of metal cations and anions cannot be realized.

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