Phenyl ring modified graphite-like carbon nitride photocatalyst, and preparation method and application thereof

A phase carbon nitride photocatalyst technology, used in physical/chemical process catalysts, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of low quantum efficiency, limitation, poor absorption performance in the visible light region, etc. Effective separation and widening of the visible light response range

Inactive Publication Date: 2016-12-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, g-C prepared by traditional methods 3 N 4 Poor absorption performance in the visible region, low quantum efficiency limits its practical application

Method used

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  • Phenyl ring modified graphite-like carbon nitride photocatalyst, and preparation method and application thereof
  • Phenyl ring modified graphite-like carbon nitride photocatalyst, and preparation method and application thereof
  • Phenyl ring modified graphite-like carbon nitride photocatalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method of a benzene ring-modified graphitic phase carbon nitride photocatalyst, comprising the following steps:

[0032] (1) Dissolving 10.0 g of urea in 50 mL of deionized water to obtain an aqueous urea solution;

[0033] (2) Add trimesic acid with a mass of 4mg into the above urea solution, stir and dissolve for 5min, and then place it in an oil bath at 100°C and evaporate to dryness;

[0034] (3) Put the evaporated powder above into a mortar and grind it evenly, then place it in a crucible, put it in a muffle furnace and bake it at 550°C for 4h, and the heating rate is 3°C / min to obtain benzene ring-modified graphite phase carbon nitride photocatalyst. The specific surface area of ​​the photocatalyst prepared in this embodiment is 102.7m 2 g -1 ; Its hydrogen production rate is about 72.5 μmol h -1 .

[0035] The structural characterization and performance testing of the benzene ring-modified graphite-like carbon nitride photocatalyst are as follo...

Embodiment 2

[0043] A preparation method of a benzene ring-modified graphitic phase carbon nitride photocatalyst, comprising the following steps:

[0044] (1) Dissolving 10.0 g of urea in 50 mL of deionized water to obtain an aqueous urea solution;

[0045] (2) Add trimesic acid with a mass of 2 mg to the above urea solution, stir and dissolve for 5 minutes, and then place it in an oil bath at 100°C and evaporate to dryness;

[0046] (3) Put the evaporated powder above into a mortar and grind it evenly, then place it in a crucible, put it into a muffle furnace and bake it at 550°C for 4h, and the heating rate is 10°C / min to obtain benzene ring-modified graphite phase carbon nitride photocatalyst. The specific surface area of ​​the photocatalyst prepared in this example is 93.1m 2 g -1 ; Its hydrogen production rate is about 42.7μmol·h -1 .

Embodiment 3

[0048] A preparation method of a benzene ring-modified graphitic phase carbon nitride photocatalyst, comprising the following steps:

[0049] (1) Dissolving 10.0 g of urea in 50 mL of deionized water to obtain an aqueous urea solution;

[0050] (2) Add trimesic acid with a mass of 6 mg to the above urea solution, stir and dissolve for 5 minutes, and then place it in an oil bath at 100°C and evaporate to dryness;

[0051] (3) Put the evaporated powder above into a mortar and grind it evenly, then place it in a crucible, put it in a muffle furnace and bake it at 550°C for 4h, and the heating rate is 3°C / min to obtain benzene ring-modified graphite phase carbon nitride photocatalyst. The specific surface area of ​​the photocatalyst prepared in this embodiment is 113.4m 2 g -1 , and its hydrogen production rate is about 46.2μmol·h -1 .

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Abstract

The invention belongs to the technical fields of material preparation and photocatalysis, and discloses a phenyl ring modified graphite-like carbon nitride photocatalyst, and a preparation method and an application thereof. The method comprises the following steps: 1, dissolving nitrogen-containing organic micro-molecules and a phenyl ring-containing compound in a solvent, and evaporating the obtained solution until the solution is dry in order to obtain a mixed precursor; and 2, roasting the mixed precursor to obtain the phenyl ring modified graphite-like carbon nitride photocatalyst, wherein the nitrogen-containing organic micro-molecules are one or more of urea and melamine; and the phenyl ring-containing compound is one or more of trimesic acid, phenol, benzoic acid and benzaldehyde. The electron structure of the photocatalyst is changed by phenyl ring modification, so the pi electron delocalization of graphite-like carbon nitride is excited, the absorption of visible lights is improved, compounding of photon-generated carriers is inhibited, and the photocatalytic hydrogen production performance is improved. The method has the advantages of simple preparation, no expensive device and good practical application prospect.

Description

technical field [0001] The invention belongs to the technical field of material preparation and photocatalysis, and specifically relates to a photocatalyst, in particular to a benzene ring-modified graphite phase carbon nitride photocatalyst and its preparation method and application. The photocatalyst is used in photocatalytic hydrogen production in the application. Background technique [0002] As a clean, renewable and environment-friendly energy, hydrogen can replace traditional fossil energy in the future and meet the growing energy demand of mankind. Efficient and economical conversion of solar energy into hydrogen energy is one of the trends in the development of hydrogen energy in the future. In 1973, Fujishima and Honda successfully used titanium dioxide electrodes to split water to produce hydrogen under the condition of ultraviolet light irradiation, which opened the door to photocatalytic hydrogen production (Nature 1972, 238, 37). Since then, researchers have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01B3/04
CPCB01J27/24C01B3/042C01B2203/1088Y02E60/36
Inventor 张伟德李馗
Owner SOUTH CHINA UNIV OF TECH
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