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C3N4 nanosheet with molecular-scale thickness as well as preparation method and application thereof

A technology of C3N4 and nanosheets, which is applied in chemical instruments and methods, textile industry wastewater treatment, organic compound/hydride/coordination complex catalysts, etc., can solve the problem of toxic organic solvents, low concentration of suspensions, and nanosheets Low yield and other problems, to achieve the effect of avoiding the use of toxic organic solvents, high concentration, and large specific surface area

Inactive Publication Date: 2013-08-21
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a C 3 N 4 Nano sheet and its preparation method and application, solve the current preparation C 3 N 4 There are problems such as low stripping efficiency of nanosheets, too low concentration of suspension, low yield of nanosheets, use of toxic organic solvents, etc.

Method used

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  • C3N4 nanosheet with molecular-scale thickness as well as preparation method and application thereof
  • C3N4 nanosheet with molecular-scale thickness as well as preparation method and application thereof
  • C3N4 nanosheet with molecular-scale thickness as well as preparation method and application thereof

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Embodiment 1

[0021] First is bulk C 3 N 4 Precursor preparation, weigh 15 g of melamine in a crucible, place it in a muffle furnace for calcination at 550°C for 4 h, grind it for later use; put 0.5 g of bulk C in a beaker 3 N 4 Add 90 mL of deionized water and 105 mL of ethanol to the precursor, then place the beaker in an ultrasonic machine for 4 h, then place the beaker in a stirrer and stir for 14 h, and then sonicate for 4 h to obtain a suspension. Centrifuge at a speed of 3,000 rpm to remove the precipitate, and finally centrifuge at a high speed of 10,000 rpm to obtain molecular-level thickness C 3 N 4 Nanosheet photocatalysts.

Embodiment 2

[0023] First is bulk C 3 N 4 Precursor preparation, weigh 10 g of melamine in a crucible, place it in a muffle furnace for calcination at 550°C for 4 h, grind it for later use; put 0.3 g of bulk C in a beaker 3 N 4 Add 60 mL of deionized water and 70 mL of ethanol to the precursor, then place the beaker in an ultrasonic machine for 4 h, then place the beaker in a stirrer and stir for 5 h, and then sonicate for 4 h to obtain a suspension. Centrifuge at a speed of 10,000 rpm to remove the precipitate, and finally centrifuge at a high speed of 10,000 rpm to obtain molecular-level thick C 3 N 4 Nanosheet photocatalysts.

Embodiment 3

[0025] First is bulk C 3 N 4 Precursor preparation, weigh 15 g of melamine in a crucible, place it in a muffle furnace for calcination at 550°C for 4 h, grind it for later use; put 1.0 g of bulk C in a beaker 3 N 4 Add 90 mL of deionized water and 105 mL of ethanol to the precursor, then place the beaker in an ultrasonic machine for 5 h, then place the beaker in a stirrer and stir for 14 h, and then sonicate for 3 h to obtain a suspension. Centrifuge at a speed of 3,000 rpm to remove precipitates, and finally centrifuge at a high speed of 10,000 rpm to obtain molecular-level thick C 3 N 4 Nanosheet glue photocatalyst.

[0026] From figure 2 Molecular-scale thicknesses of C can be found in 3 N 4 The XRD diffraction peaks of the nanosheets were significantly weakened or even disappeared, indicating that the bulk C 3 N 4 Nanosheets with monolayer thickness have been successfully fabricated. From image 3 The prepared molecular-scale thickness of C can be found in 3 N...

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Abstract

The invention discloses a C3N4 nanosheet with a molecular-scale thickness as well as a preparation method and an application thereof, which belong to the technical fields of material preparation and photocatalysis. The C3N4 nanosheet photocatalyst with a molecular-scale thickness disclosed by the invention is prepared in a water / ethanol mixed system via an ultrasonic treatment-stirring combination method. The preparation method of the catalyst comprises the following two steps of: step 1, synthesising a bulk-phase C3N4 precursor via a solid-phase thermal polymerization method; and step 2, stripping via ultrasonic treatment-stirring combination to prepare the C3N4 nanosheet. The C3N4 nanosheet photocatalyst prepared by the preparation method is high in specific surface area and photon-generated carrier separation efficiency, capable of efficiently degrading organic pollutants, and particularly efficiently decolouring printing and dyeing wastewater, and high in activity in the aspects of hydrogen production from photocatalytic water splitting and photocatalytic selective oxidation for alcohols simultaneously. The catalyst is simple in preparation process, low in cost, green and environment-friendly in production process, high in stability, capable of meeting actual production needs, and high in application potential.

Description

technical field [0001] The invention belongs to the technical field of material preparation and photocatalysis, and specifically relates to a C 3 N 4 Nano sheet and its preparation method and application in water / ethanol mixed system. Background technique [0002] Due to its thorough reaction, mild reaction conditions, and redox ability, photocatalytic technology has rapidly developed into a new technology that can use solar energy for environmental purification and energy conversion in recent years, and has become the most concerned research hotspot. However, there are still key core scientific problems such as low quantum efficiency in semiconductor photocatalysis, which greatly restricts its development. The key to the solution still lies in the photocatalyst. Therefore, scholars at home and abroad have done a lot of exploration work in improving the photon quantum efficiency of photocatalysts: for example, a lot of exploration has been done in the modification and modi...

Claims

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Application Information

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IPC IPC(8): C07D487/22B01J31/06C02F1/30C02F103/30
Inventor 梁诗景林秋燕毕进红刘明华
Owner FUZHOU UNIV
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