a g-c 3 no 4 Nanosheet and its preparation method and application

A technology of g-c3n4 and nanosheets, which is applied in the field of nanomaterials and photodegradation, can solve the problems of high equipment requirements, low cost, and short cycle, and achieve the effects of efficient use of solar energy, less waste discharge, and simple processes

Active Publication Date: 2019-08-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this preparation method and other existing preparations of g-C 3 N 4 The methods of nanosheets all have the disadvantages of long processing time and high requirements for equipment in a concentrated acid environment, and cannot simultaneously meet the requirements of large size, controllable number of nanosheet layers, simple operation, short cycle, and low cost. A certain gap, so g-C 3 N 4 The preparation of nanosheets is still the focus of future research

Method used

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  • a g-c <sub>3</sub> no <sub>4</sub> Nanosheet and its preparation method and application
  • a g-c <sub>3</sub> no <sub>4</sub> Nanosheet and its preparation method and application
  • a g-c <sub>3</sub> no <sub>4</sub> Nanosheet and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0034] A g-C of the present invention 3 N 4 Nanosheets, sheet-like structures such as figure 1 As shown, the atomic force microscope (AFM) image is shown in Figure 4 As shown, the nitrogen adsorption curve is shown in Figure 5 shown. Depend on Figure 4 , Figure 5 It can be seen that the g-C prepared in this example 3 N 4 The thickness of the nanosheet is 3.07nm, and the specific surface area is 103.24m 2 / g.

[0035] g-C of this example 3 N 4 The preparation method of nano sheet, comprises the following steps:

[0036] (1) Weigh 2.31g of cyanuric acid and 0.26g of melamine (the molar ratio of cyanuric acid to melamine is 9:1) and mix and grind them in a mortar for 30min to prepare a precursor; (2) transfer the precursor to Put the crucible in a muffle furnace and calcinate at 550°C for 4h in an air atmosphere, and cool down to room temperature naturally to obtain g-C 3 N 4 Nanosheets.

[0037] Weigh 10 mg of the prepared material and disperse it in 100 mL of 1...

Embodiment 2

[0039] A g-C of the present invention 3 N 4 Nanosheets, sheet-like structures such as figure 2 As shown, the sheet thickness is 10nm, and the specific surface area is 31.21m 2 / g.

[0040] g-C of this example 3 N 4 The preparation method of nano sheet, comprises the following steps:

[0041] (1) Weigh 2.06g cyanuric acid and 0.52g melamine and mix and grind for 30min in a mortar, (the molar ratio of cyanuric acid and melamine is 4:1) to prepare a precursor; (2) transfer the precursor to Put the crucible in a muffle furnace and calcinate at 550°C for 4h in an air atmosphere, and cool down to room temperature naturally to obtain g-C 3 N 4 Nanosheets.

[0042] Weigh 10 mg of the prepared material and disperse it in 100 mL of 10 mg / L phenol solution. After 30 min of dark treatment, it begins to irradiate with visible light for 210 min. Samples are taken every 30 min for liquid chromatography analysis to obtain the degradation rate of phenol.

Embodiment 3

[0044] A g-C of the present invention 3 N 4 Nanosheets, whose sheet-like structure is as image 3 As shown, the sheet thickness is 20nm and the specific surface area is 24.37m 2 / g; combine figure 1 , figure 2 It can be seen that the g-C prepared in this example 3 N 4 Nano sheet is thicker than embodiment 1,2.

[0045] g-C of this example 3 N 4 The preparation method of nano sheet, comprises the following steps:

[0046] (1) Weigh 1.29g cyanuric acid and 1.26g dicyandiamide (the molar ratio of cyanuric acid to dicyandiamide is 2:3) and mix and grind for 30min in a mortar to prepare the precursor; (2) The precursor was transferred to a crucible, and the crucible was placed in a muffle furnace and calcined at 550 °C for 4 h in an air atmosphere, and cooled naturally to room temperature to obtain g-C 3 N 4 Nanosheets.

[0047] Weigh 10 mg of the prepared material and disperse it in 100 mL of 10 mg / L phenol solution. After 30 min of dark treatment, it begins to irradi...

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Abstract

The invention discloses a g-C3N4 nanosheet. The thickness of the nanosheet is 1-200nm and the specific surface area is 10-200m<2>g<-1>. The invention further provides a preparation method of the g-C3N4 nanosheet and an application of the g-C3N4 nanosheet in photocatalytic degradation of phenol in the field of sewage treatment. The preparation method comprises the following steps of (1) grinding and mixing a carbon-nitrogen-containing organic matter and cyanuric acid to prepare a precursor; and (2) pouring the precursor into a crucible for burning and reacting to obtain the g-C3N4 nanosheet. The prepared g-C3N4 nanosheet can be widely applied to photodegradation of water, organic matter preparation and sterilization in the fields of energy, environments and medicine. The g-C3N4 nanosheet has a visible-light response, an appropriate band gap and high specific surface area, is a photodegradable material with good property, and solar energy can be efficiently utilized. The preparation method is economical, environment-friendly, simple in process, few in discharged wastes in the preparation technology and suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of nanomaterials and photodegradation, in particular to a g-C 3 N 4 Nanosheets and their preparation methods and applications. Background technique [0002] The heterogeneous photocatalytic reaction using semiconductors as catalysts has great potential in solar energy conversion and environmental pollution control due to its unique advantages such as mild reaction conditions, direct use of sunlight, and deep mineralization. Semiconductor materials directly convert solar energy into energy fuels and chemical energy, which has been regarded as a green and sustainable way to deal with future energy and environmental crises. Photocatalytic reactions use sunlight as a driving force to perform a large number of catalytic reactions with appropriate semiconductor materials, such as water splitting to produce H 2 and O 2 , reduction of carbon dioxide to synthesize hydrocarbon fuels, degradation of organic pollutants, disin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/082B01J27/24B01J35/10C02F1/30C02F101/34B82Y40/00
CPCC01B21/0605C02F1/30B01J27/24C01P2004/24C01P2004/04C01P2004/03C02F2101/345C01P2006/12C02F2305/08C02F2305/10B01J35/40B01J35/613B01J35/39B01J35/615Y02W10/37
Inventor 刘素琴丁望袁修贵何震
Owner CENT SOUTH UNIV
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