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Flower-shaped structure photocatalyst for reducing carbon dioxide as well as preparation method and application of flower-shaped structure photocatalyst

A carbon dioxide and flower-like structure technology, applied in the field of photocatalysis, can solve the problems of low carrier mobility, preparation process load, and low catalytic efficiency, and achieve the effects of simple operation, low cost, and low working temperature

Active Publication Date: 2022-08-09
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently prepared carbon dioxide photocatalysts usually use transition metals to support composite materials, but there are problems of low preparation process loading and catalytic efficiency.
The problem of low quantum efficiency exhibited by carbon dioxide photocatalysts due to low carrier mobility needs to be solved urgently

Method used

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  • Flower-shaped structure photocatalyst for reducing carbon dioxide as well as preparation method and application of flower-shaped structure photocatalyst
  • Flower-shaped structure photocatalyst for reducing carbon dioxide as well as preparation method and application of flower-shaped structure photocatalyst
  • Flower-shaped structure photocatalyst for reducing carbon dioxide as well as preparation method and application of flower-shaped structure photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 0.233 g of cobalt nitrate, 0.15 g of aluminum nitrate, 0.15 g of ammonium fluoride and 1.7 g of urea were dissolved in 40 mL of deionized water and magnetically stirred at room temperature for one hour. The precursor was transferred to a 100-ml polytetrafluoroethylene stainless steel autoclave, and then placed in a constant temperature drying oven, sealed and heated at 90°C for 8 hours. After natural cooling to room temperature, rinse thoroughly with deionized water and ethanol. The obtained powder was dried in air at 60 °C for 12 h and named CoAl-LDHs.

[0036] Figure 7 show that the CH of the uncalcined precursor CoAl-LDHs catalyst 4and CO yields were 40.37 μmol / g and 20.24 μmol / g, respectively.

[0037] The obtained precursor powder was placed in a porcelain crucible under an air atmosphere at 5 °C min -1 The heating rate was heated in a muffle furnace, and calcined to 650 °C for 3 h, and the obtained product was named CoAl-650. The scanning electron microscope...

Embodiment 2

[0040] The method used in this example is the same as that used in Example 1, and the only difference is that the calcination procedure is different. In this example, the calcination was performed to 750° C., and the obtained product was named CoAl-750. The scanning electron microscope image of the thinner 3D flower-like CoAl-LDHs precursor obtained in Example 2 at 750 °C is as follows image 3 shown. Figure 4 The TEM image of the thinner 3D flower-like CoAl-LDHs precursor obtained in Example 2 calcined at 750°C. Figure 5 It is the X-ray diffraction pattern of the thin 3D flower-like CoAl-LDHs precursor obtained in Example 2 calcined at 750 ° C of the composite material; it can be seen from the figure that the ultrathin 3D porous CoAl 2 O 4 A composite material is formed. Example 2 to obtain 3D porous flower-like CoAl 2 O 4 The composites were irradiated with CO and CH under visible light at 200-800 nm for 7 hours 4 A comparison of yields such as Figure 7 shown.

[...

Embodiment 3

[0043] The method used in this example is the same as that used in Example 1, and the difference is only in the calcination procedure. In this example, the calcination was carried out to 850° C., and the obtained product was named CoAl-850. The scanning electron microscope image of the thinner 3D flower-like CoAl-LDHs precursor obtained in Example 3 calcined at 850 °C is as follows Image 6 shown. Example 3 to obtain 3D porous flower-like CoAl 2 O 4 The composites were irradiated with CO and CH under visible light at 200-800 nm for 7 hours 4 A comparison of yields such as Figure 7 shown.

[0044] Figure 7 shows that the 3D porous flower-like CoAl obtained by calcination at 850 °C 2 O 4 Catalyst CH 4 and CO yields were 46.12 μmol / g and 25.29 μmol / g, respectively.

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Abstract

The invention provides a flower-shaped structure photocatalyst for reducing carbon dioxide as well as a preparation method and application of the flower-shaped structure photocatalyst. According to the preparation method, the thinner 3D flower-shaped CoAl-LDHs are converted into ultrathin 3D porous CoAl2O4 by adopting treatment at different temperatures, so that the CO2 reduction catalysis efficiency of the photocatalyst is further improved while the defects of the CoAl-LDHs are overcome. When the composite material is used for photocatalytic CO2 reduction under the irradiation of visible light with the wavelength of 200-800nm, a heating system is not needed, detection can be carried out at room temperature, the working temperature is low, and the operation condition is mild; the maximum yields of the composite material for reducing and converting CO2 into CH4 and CO through photocatalysis are 58.98 mu mol / g and 33.11 mu mol / g respectively at the room temperature of 20-40 DEG C and under the irradiation of visible light, and the composite material has high stability. The invention provides a simple preparation method which is low in cost and convenient to popularize and apply.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a photocatalyst for reducing carbon dioxide with a flower-like structure and a preparation method and application thereof. Transforming thin 3D flower-like CoAl-LDHs into ultrathin 3D porous CoAl using different temperature treatments 2 O 4 , while improving the shortcomings of thinner 3D flower-like CoAl-LDH, and further improving the catalytic reduction efficiency of photocatalysts. Background technique [0002] In recent years, in response to global warming and climate change, researchers have created more efficient and productive carbon dioxide capture and storage technologies. Inspired by natural photosynthesis, artificial photocatalytic emission reduction has come into the field of researchers' vision. It can not only alleviate the resource depletion caused by the consumption of large amounts of fossil fuels, but also effectively solve the environmental...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J35/00B01J35/02B01J35/10B01J37/08C01B32/40C07C1/02C07C9/04
CPCB01J23/75B01J37/08C01B32/40C07C1/02B01J35/50B01J35/60B01J35/39C07C9/04Y02A50/20
Inventor 吕菲何浪赵焱
Owner WUHAN UNIV
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