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Graphite-phase carbon nitride (g-C3N4) material and preparation method and application thereof

A graphitic carbon nitride and carbon nitride technology, applied in chemical instruments and methods, nitrogen compounds, separation methods, etc., can solve the problems of affecting the degradation effect, complex control conditions, difficult operation, etc., to promote the reaction mass transfer, The effect of large active specific surface area and strong redox ability

Active Publication Date: 2015-12-09
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, organic carbon will remain in g-C during the synthesis process of soft template method 3 N 4 The surface affects the degradation effect (J.Mater.Chem.2011,21,3890-3894); when the silica template method is synthesized, it is necessary to use ammonia water or hydrofluoric acid to remove the silica, which is cumbersome and not environmentally friendly (J. Am.Chem.Soc.2009,131,1680-1681)
In addition, the g-C prepared by template method 3 N 4 The pore structure is relatively regular and limited by the template structure, the control conditions are complicated and the operation is difficult

Method used

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  • Graphite-phase carbon nitride (g-C3N4) material and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0052] A method for preparing graphite phase carbon nitride material, comprising the steps of:

[0053] (1) Weigh 10g of thiourea and ammonium chloride respectively, pour into a 100mL beaker, add 30mL of pure water to dissolve;

[0054] (2) Move the beaker to a magnetic stirring water bath, continue stirring at 70°C for 60 minutes, and evaporate most of the water to obtain a paste;

[0055] (3) Put the obtained paste-like object into a vacuum drying oven, and vacuum-dry it at 60° C. for 16 hours to completely remove water to obtain a solid;

[0056] (4) Put the obtained solid into a corundum crucible, place it in a muffle furnace, raise the temperature from room temperature to 550°C at a rate of 15°C / min, keep it for 2 hours and then cool it naturally, the obtained powder is honeycomb porous graphite phase nitrogen carbonized material (g-C 3 N 4 ).

Embodiment 2

[0060] A method for preparing graphite phase carbon nitride material, comprising the steps of:

[0061] (1) Take by weighing the mixture of 10g dicyandiamide and 15g ammonium carbonate and ammonium bicarbonate (mass ratio 1:1) respectively, dissolve in 60mL ethanol;

[0062] (2) The mixture of step (1) was continuously heated and stirred at 30° C. for 6 h, and most of the ethanol was removed by evaporation;

[0063] (3) Freeze and vacuum-dry the product of step (2) for 48 hours at -50° C., completely remove ethanol to obtain a solid;

[0064] (4) Put the dried solid in a corundum crucible, put it into a tube furnace and blow in air, raise the temperature to 550°C at a rate of 1°C / min, keep it for 4 hours and then cool it naturally, the obtained powder is honeycomb-shaped porous Graphite phase carbon nitride material (g-C 3 N 4 ).

Embodiment 3

[0068] A method for preparing graphite phase carbon nitride material, comprising the steps of:

[0069] (1) Weigh 20g of urea and 8g of ammonium oxalate respectively, pour them into a mixed solution of 40mL of ethanol and water, and the volume ratio of ethanol and water is 1:1;

[0070] (2) After the mixture in step (1) was continuously stirred at 90° C. for 0.5 h, most of the water and ethanol were evaporated to remove;

[0071] (3) The product of step (2) was vacuum-dried at 80° C. for 24 hours, and the ethanol was completely removed to obtain a solid;

[0072] (4) Put the dried solid in a corundum crucible, put it into a muffle furnace, raise the temperature from room temperature to 700°C at a heating rate of 8°C / min, and keep it for 1.5h, then cool naturally, and the obtained powder is honeycomb shape Porous graphitic carbon nitride material (g-C 3 N 4 ).

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Abstract

The invention relates to a method for preparing a graphite-phase carbon nitride (g-C3N4) material. The method includes the steps that a carbon nitride precursor and ammonium salt are evenly mixed, and then calcination is conducted so that the porous g-C3N4 material can be obtained. The ammonium salt is any one of ammonium base salts capable of generating ammonia gas through thermal decomposition or is the combination of at least two of the ammonium base salts. In the preparation process of the g-C3N4 material, the ammonium salt is added into the carbon nitride precursor to be mixed. In the high-temperature calcining process, the ammonium salt is subjected to pyrogenic decomposition to generate gas, a pore-forming effect on the g-C3N4 material is achieved, and the cellular porous g-C3N4 material is obtained. In the preparation process of the g-C3N4 material, template agents are not used, and thus the method is simple, efficient and environmentally friendly; the prepared g-C3N4 material is high in photocatalytic activity and can be used in the pollution control processes such as exhaust gas and wastewater treatment.

Description

technical field [0001] The invention relates to a visible light catalysis and ozone-visible light catalysis material with broad application prospects in the field of waste water and waste gas treatment, in particular to a graphite phase carbon nitride material, its preparation method and application, and in particular to a porous graphite phase nitrogen carbon dioxide (g-C 3 N 4 ) materials, their preparation methods and uses. Background technique [0002] Energy crisis and environmental pollution are two major problems faced by human beings in the new century. Visible light catalysis technology can use solar energy to effectively degrade pollutants in water or gas phase. Its development has positive significance for alleviating and synergistically solving these two problems. As the core of the research and development of visible light catalysis technology, it is particularly critical to develop a cheap, easy to obtain, efficient and stable visible light catalyst. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01B21/082B01D53/86B01D53/90B01D53/44C02F1/30C02F1/78C02F101/34
CPCC01B21/0605C01P2004/20C01P2006/12C01P2006/14C01P2006/16Y02W10/37
Inventor 谢勇冰曹宏斌肖家栋李玉平盛宇星
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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