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Carbon-rich graphitic carbon nitride (g-C3N4) nanosheet and preparation method thereof

A nanosheet, g-c3n4 technology, applied in the field of carbon-rich g-C3N4 nanosheets and its preparation, can solve the problems of complicated experimental operation, structure destruction, cumbersome process, etc., and achieves simple experimental operation, low recombination probability, photocatalysis Efficient effect

Inactive Publication Date: 2017-09-22
HEFEI UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

But by introducing foreign atoms or ions to prepare g-C 3 N 4 Photocatalyst, on the one hand, the experimental operation is more complicated and the process is more cumbersome, on the other hand, the introduction of foreign atoms or ions into g-C 3 N 4 Low success rate and can destroy g-C 3 N 4 own structure

Method used

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  • Carbon-rich graphitic carbon nitride (g-C3N4) nanosheet and preparation method thereof
  • Carbon-rich graphitic carbon nitride (g-C3N4) nanosheet and preparation method thereof
  • Carbon-rich graphitic carbon nitride (g-C3N4) nanosheet and preparation method thereof

Examples

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Embodiment 1

[0025] A carbon-rich g-C 3 N 4 Nanosheet and preparation method thereof, the specific steps are as follows:

[0026] (1) Primary thermal oxidation: take melamine as raw material, place the raw material in a burning boat, then place the burning boat in a muffle furnace, and keep the temperature at 550 °C for 4 hours in the air to obtain g-C 3 N 4 meal;

[0027] (2) Secondary thermal oxidation: with g-C in step (1) 3 N 4 Coarse powder is used as raw material, the raw material is placed in a burning boat, put into a closed tube furnace, nitrogen is used as a carrier gas, and nitrogen is passed through an ethanol solution with a concentration of 5% and then into the closed tube furnace, Then, it was kept at 500 °C for 2 h to obtain carbon-rich g-C 3 N 4 Nanosheets.

[0028] Carbon-rich g-C prepared in this embodiment 3 N 4 The carbon-nitrogen ratio of nanosheets is 0.90, and ultrathin g-C is obtained 3 N 4 Nanosheets, with high photocatalytic activity, can achieve comp...

Embodiment 2

[0030] Carbon-rich g-C in this example 3 N 4 The preparation method of nanosheets is the same as that in Example 1, except that the melamine in step (1) is changed to thiourea.

[0031] Carbon-rich g-C prepared in this example 3 N 4 The carbon-nitrogen ratio of the nanosheets is 0.88, and the morphology is flake-like g-C 3 N 4 Nanosheets, with high photocatalytic activity, can achieve complete degradation of 40 mg / L rhodamine B within 25 min under visible light conditions, and the efficiency of photo-splitting water for hydrogen production is 1576.43 μmol·g -1 ·h -1 .

Embodiment 3

[0033] Carbon-rich g-C in this example 3 N 4 The preparation method of the nanosheet is the same as that in Example 1, except that the melamine in step (1) is changed to cyanamide.

[0034] Carbon-rich g-C prepared in this example 3 N 4 The carbon-nitrogen ratio of the nanosheets is 0.92, and the morphology is flake-like g-C 3 N 4Nanosheets, with high photocatalytic activity, can achieve complete degradation of 40 mg / mL Rhodamine B within 25 min under visible light conditions, and the hydrogen production efficiency of photo-splitting water is 1584.43 μmol·g -1 ·h -1 .

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Abstract

The invention discloses a carbon-rich graphitic carbon nitride (g-C3N4) nanosheet and a prepration method thereof. The carbon-rich g-C3N4 nanosheet is of a high-dispersion nanosheet structure, and a C / N ratio of the carbon-rich g-C3N4 nanosheet is between 0.82 and 0.96. In preparation, a compound which can generate a structure containing a triazine ring through a polymerization effect is utilized as a raw material, ethanol water with different concentrations is utilized as a carbon source, and the carbon-rich g-C3N4 nanosheet can be obtained through twice thermal oxidation. Compared with g-C3N4 prepared in a traditional method, the ultrathin carbon-rich g-C3N4 nanosheet disclosed by the invention has a higher carbon nitrogen ratio, a high specific surface area, a wide light absorption region and stronger efficiency of photocatalytically splitting water into hydrogen.

Description

technical field [0001] The invention relates to the technical field of nanomaterials and photo-splitting water for hydrogen production, in particular to a carbon-rich g-C 3 N 4 Nanosheets and preparation methods thereof. Background technique [0002] Carbon nitride is considered to be a new material that can replace carbon materials because it can make up for many deficiencies in carbon materials. In different carbon nitride structures, the graphitic carbon nitride (g-C 3 N 4 ) is considered to be the most stable one. And because of the wide source of raw materials, simple preparation method, stable chemical properties and excellent semiconductor properties, it has broad application prospects in photocatalytic degradation of pollutants, photocatalytic synthesis of organic compounds and photocatalytic water splitting to produce hydrogen. [0003] g-C 3 N 4 The forbidden band width of the nanophotocatalyst is about 2.7eV, in which the conduction band and valence band ar...

Claims

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Application Information

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IPC IPC(8): B01J27/24C01B3/04C02F1/30B82Y40/00C02F101/34C02F101/36C02F101/38
CPCB82Y40/00C01B3/042C02F1/30B01J27/24C02F2101/34C02F2101/36C02F2101/38C02F2305/10B01J35/39B01J35/40Y02E60/36
Inventor 徐光青范程控冯强吕珺吴玉程
Owner HEFEI UNIV OF TECH
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