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A kind of graphitic nitrogen carbide nanosheet/zif-67 sheet structure composite material

A composite material and lamellar structure technology, applied in chemical/physical processes, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as low efficiency of quantum dots, few active sites, and small specific surface area. Achieve excellent photocatalytic performance, many sites, and large specific surface area

Inactive Publication Date: 2019-06-18
FUJIAN MEDICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, graphite-phase nitrogen carbide semiconductor materials, as a metal-free visible light photocatalyst, have attracted widespread attention from scientists and researchers, but there are still defects that cannot be ignored, such as small specific surface area and few active sites. , resulting in low efficiency of its quantum dots
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Method used

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  • A kind of graphitic nitrogen carbide nanosheet/zif-67 sheet structure composite material
  • A kind of graphitic nitrogen carbide nanosheet/zif-67 sheet structure composite material
  • A kind of graphitic nitrogen carbide nanosheet/zif-67 sheet structure composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Spread 2 g of melamine powder on the bottom of a 50 mL crucible, close the lid tightly, transfer to a muffle furnace, raise the temperature to 550 °C at a rate of 2.3 °C / min and keep it for 4 h, then increase the temperature at a rate of 2.3 °C / min Cool down to room temperature to get pale yellow g-C 3 N 4 powder;

[0028] 2) Take 0.3 g of g-C prepared above 3 N 4 powder, add 200 mL deionized water, 150 W ultrasonic stripping for 6 h, centrifuge the solution at 3000 rpm for 5 min, remove the unexfoliated solids in the lower layer, and freeze-dry the obtained supernatant to obtain g-C 3 N 4 Nanosheet solids.

Embodiment 2

[0030] 1) the obtained g-C of embodiment 1 3 N 4 The solid nanosheets were dissolved in a mixed solvent of methanol-ethanol (v:v=1:1), and dispersed by ultrasound to obtain g-C with a concentration of 1mg / mL 3 N 4 nanosheet dispersion;

[0031] 2) Add 150 mg Co(NO 3 ) 2 ·6H 2 O dissolved in 20 mL g-C 3 N 4 nanosheet dispersion to obtain solution A; take a 100 mL Erlenmeyer flask, and inject solution A into the bottom of the glass bottle;

[0032] 3) Dissolve 160 mg of 2-methylimidazole in 20 mL of methanol-ethanol mixed solvent with a volume ratio of 1:1 to obtain solution B;

[0033] 4) Rapidly inject solution B into solution A and stir vigorously for 30 s, then let it stand for 24 h;

[0034] 5) After the reaction was completed, the obtained purple powder was repeatedly washed with methanol and ethanol for 3-4 times, centrifuged at 8000 rpm for 5 min, and dried in vacuum at 100°C overnight to obtain g-C 3 N 4 Nanosheet / ZiF-67 composites.

[0035] figure 1 , 2 a...

Embodiment 3

[0036] Example 3 Photocatalytic carbon dioxide reduction experiment

[0037] At room temperature, 1 atm CO 2 Under the condition of , add 150 mg g-C in 80 mL reaction kettle 3 N 4The nanosheet / ZiF-67 composite was used as the catalyst, and 10 mL of deionized water was added as the reaction raw material, and the reaction was performed under magnetic stirring for 1 h. A 500 W Xe light source was used as a light source during the reaction, and a filter was used to filter out light below 420 nm. Final gaseous products were detected using an Agilent 7820A gas chromatograph. Simultaneously with g-C 3 N 4 Nanosheets, commercially available ZiF-67 and TiO 2 / ZiF-67 composite material, g-C 3 N 4 / UiO-66 (Zr) composite material, g-C 3 N 4 / CuBTC composites for comparison. see results image 3 .

[0038] Depend on image 3 Visible, with g-C 3 N 4 Compared with nanosheets, commercially available ZiF-67 and other composite materials, g-C prepared by the present invention ...

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Abstract

The invention discloses a graphite phase carbide nitride nanosheet / ZiF-67 lamellar structure composite material, and a preparation method and application thereof. The preparation method comprises the steps of adopting a stripped graphite phase carbide nitride nanosheet, metal and an organic ligand as raw materials, and directly reacting at normal temperature to prepare the graphite phase carbide nitride nanosheet / ZiF-67 composite material with a lamellar structure. The graphite phase carbide nitride nanosheet / ZiF-67 lamellar structure composite material provided by the invention is simple in process and low in cost; compared with a pure two-dimensional carbide nitride nano material, ZiF-67 sheets in the composite material obtained by the invention are uniformly attached onto the carbide nitride nanosheet, so that the specific surface area of the material and a screening ability on a catalyzed substrate can be effectively improved, and the composite material has much high-efficient photocatalytic performance, and can be used for carrying out photocatalytic reduction on carbon dioxide.

Description

technical field [0001] The invention belongs to the field of preparation of catalytic materials, and in particular relates to a graphite-phase nitrogen carbide nanosheet / ZiF-67 sheet structure composite material and a preparation method and application thereof. Background technique [0002] Using solar energy to solve global energy and environmental problems is an important research direction in the field of scientific research today. Semiconductor photocatalytic nanomaterials can make full use of solar energy at room temperature, and have many advantages such as low cost and no pollution. The problem of energy shortage is of great significance. For many years, researchers have been working on the development of stable and high-efficiency visible light catalysts. In recent years, graphite-phase nitrogen carbide semiconductor materials, as a metal-free visible light photocatalyst, have attracted widespread attention from scientists and researchers, but there are still defect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/10
CPCB01J27/24B01J35/004B01J35/10
Inventor 孙伟明李祥辉李春艳康杰
Owner FUJIAN MEDICAL UNIV
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