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Carbon nitride composite photocatalyst based on oxygen doping as well as preparation method and application thereof

A carbon nitride and composite light technology, applied in the directions of carbon monoxide, physical/chemical process catalysts, chemical instruments and methods, can solve the problems of cumbersome preparation process, waste of time, poor catalytic performance, etc., and achieve simple and easy post-processing, Excellent performance and improved carrier transfer

Pending Publication Date: 2021-07-20
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cumbersome preparation process of oxygen-doped CN catalysts in the prior art leads to waste of time and raw materials, and the prepared O-doped CN materials are amorphous and have poor catalytic performance.

Method used

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  • Carbon nitride composite photocatalyst based on oxygen doping as well as preparation method and application thereof
  • Carbon nitride composite photocatalyst based on oxygen doping as well as preparation method and application thereof
  • Carbon nitride composite photocatalyst based on oxygen doping as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Dissolve 5.0 mmol of 1,3,5-trichlorotriazine CC in 50 mL of acetonitrile containing 0.5 mmol of dicyandiamide DCNA, subject the mixture to ultrasonic stirring for 10 min, and then transfer to a 100 mL Teflon-lined autoclave In the sterilizer, the autoclave was sealed and subjected to hydrothermal reaction at 180 °C for 22 h, cooled to room temperature after the reaction, washed with distilled water and ethanol, and vacuum-dried at 60 °C for 12 h to obtain the oxygen-doped nitriding Carbon composite photocatalyst, denoted as O-CN- 0.1 , where 0.1 is the raw material molar ratio of DCNA and CC.

[0039] figure 1 Schematic diagram of the process based on oxygen-doped carbon nitride composite photocatalyst, figure 2 It is the physical picture of the carbon nitride composite photocatalyst based on oxygen doping. As can be seen from the figure, figure 2 O-CN- prepared in c 0.25 The red is the deepest, which indicates that the content of CC has a great influence on the ...

Embodiment 2

[0041] Dissolve 5.0 mmol of 1,3,5-trichlorotriazine CC in 50 mL of acetonitrile containing 0.75 mmol of dicyandiamide DCNA, subject the mixture to ultrasonic stirring for 20 min, and then transfer to a 100 mL Teflon-lined autoclave In a sterilizer, the autoclave was sealed and subjected to hydrothermal reaction at 200 °C for 24 h, cooled to room temperature after the reaction, washed with distilled water and ethanol, and vacuum-dried at 60 °C for 12 h to obtain the oxygen-doped nitriding Carbon composite photocatalyst, denoted as O-CN- 0.15 .

[0042] image 3 a is the XRD spectrum of prepared different samples, as can be seen from the figure, pure g-C 3 N 4 There are two distinct peaks at 13.0 and 27.4, corresponding to the (100) and (002) planes, respectively, the diffraction peak at 27.4° of O-CN-x shifts to lower diffraction angles, and the peak at 13.0° Significantly weakened, indicating that O was successfully embedded in the CN lattice. This is because the electron...

Embodiment 3

[0044] Dissolve 5.0 mmol 1,3,5-trichlorotriazine CC in 50 mL acetonitrile containing 1.25 mmol dicyandiamide DCNA, subject the mixture to ultrasonic stirring for 20 min, and then transfer to a 100 mL polytetrafluoroethylene-lined autoclave In a sterilizer, hydrothermally reacted at 200 °C for 24 h, cooled to room temperature after the reaction, washed with distilled water and ethanol and dried in vacuum at 60 °C for 12 h to obtain the oxygen-doped carbon nitride composite photocatalyst, denoted as O -CN- 0.25 .

[0045] Figure 4 a is pure g-C 3 N 4 and O-CN- 0.25 The XPS figure, it can be seen from the figure that pure g-C 3 N 4 and O-CN- 0.25 The elements C, N and O can be detected in all, but O-CN- 0.25 The O 1s peak intensity of the O 1s is significantly higher than that of pure g-C 3 N 4 , which shows that O-CN- 0.25 Surface O atoms are more abundant. Figure 4 b is O-CN- 0.25 It can be seen from the figure that the peaks at 284.6 eV, 286.8 eV and 288.9 eV ar...

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Abstract

The invention provides a carbon nitride composite photocatalyst based on oxygen doping as well as a preparation method and application thereof, and belongs to the technical field of preparation of photocatalytic composite materials. According to the preparation method disclosed by the invention, dicyandiamide (DCNA) and trichlorotriazine (CC) are used as precursors, and the carbon nitride composite photocatalyst based on oxygen doping is prepared by a one-step hydrothermal method; wherein the light utilization rate, CO2 affinity and carrier transfer of the composite photocatalyst are greatly improved, so that the composite photocatalyst has good application in photocatalytic reduction of CO2 to high value-added fuel conversion.

Description

technical field [0001] The invention belongs to the technical field of preparation of photocatalytic composite materials, and in particular relates to an oxygen-doped carbon nitride composite photocatalyst and its preparation method and application. Background technique [0002] Existing photocatalysts have low charge separation efficiency and insufficient surface active sites, making it difficult to achieve CO 2 efficient photocatalytic conversion. Graphitized carbon nitride (g-C 3 N 4 ) is considered as a promising CO due to its low cost, high chemical stability, non-toxicity, and unique electronic band structure. 2 reduced photocatalyst, but g-C 3 N 4 The carrier recombination rate is high, and the limitation of the band structure reduces its effect on CO 2 recovery ability. [0003] In recent years, the technology of introducing heteroatoms to improve the performance of photocatalysts has received extensive attention. in g-C 3 N 4 Doping non-metal or metal elem...

Claims

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Application Information

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IPC IPC(8): B01J27/24C10L3/08C01B32/40
CPCB01J27/24C10L3/08C01B32/40B01J35/39
Inventor 唐旭朱志
Owner JIANGSU UNIV
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