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Preparation method and application of rare earth vanadate two-dimensional nanosheet photocatalytic material

A rare-earth vanadate and two-dimensional nanotechnology, which is applied in the preparation/separation of ammonia, chemical instruments and methods, and catalysts for physical/chemical processes, etc., to achieve small band gap, excellent performance, and favorable light penetration Effect

Pending Publication Date: 2022-01-28
江苏纳欧新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the application of two-dimensional rare earth vanadates with upconversion effect for photocatalytic nitrogen fixation to ammonia synthesis has not been reported

Method used

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  • Preparation method and application of rare earth vanadate two-dimensional nanosheet photocatalytic material
  • Preparation method and application of rare earth vanadate two-dimensional nanosheet photocatalytic material
  • Preparation method and application of rare earth vanadate two-dimensional nanosheet photocatalytic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 100mL of Sm(NO 3 ) 3 ·6H 2 O and NH 4 VO 3 Mix in deionized water (both concentrations are 0.001mol / L), ultrasonicate until completely dissolved, add 0.001mol organic template polyvinylpyrrolidone under heating and magnetic stirring conditions, and adjust the pH of the solution to 1 with hydrochloric acid, and then mix the solution Transfer to a sealed Teflon autoclave and react at 120°C for 2 hours under microwave hydrothermal conditions. After naturally cooling to room temperature, the resulting precipitate was collected by centrifugation and washed several times with deionized water. Finally, dry at 80°C for 12 hours to obtain SmVO 4 Two-dimensional nanosheet materials.

[0027] figure 1 is SmVO 4 The XRD patterns and SmVO 4 PDF card (JCPDS No.17-0876). It can be seen from the figure that the three strong peaks at 2θ = 24.9°, 33.2°, 48.6° correspond to SmVO 4 The (200), (112), (312) planes determine the SmVO 4 the existence of species. In addition, there...

Embodiment 2

[0032] 100mL of Ce(NO 3 ) 3 ·6H 2 O and NH 4 VO 3Mix in deionized water (both concentrations are 0.1mol / L), ultrasonicate until completely dissolved, add 0.01mol organic template polyvinylpyrrolidone under heating and magnetic stirring conditions, and adjust the pH of the solution to 4 with nitric acid, and then mix the The solution was transferred to a sealed Teflon autoclave, and reacted for 1 hour under the condition of microwave hydrothermal heating at 180°C. After naturally cooling to room temperature, the resulting precipitate was collected by centrifugation and washed several times with deionized water. Finally, dry at 80°C for 12 hours to obtain CeVO 4 Two-dimensional nanosheet materials.

[0033] The invention also provides the above material for photocatalytic synthesis of ammonia. Under full-spectrum irradiation of 300W xenon lamp, CeVO 4 The ammonia yield of nanosheets reached 116umolg -1 h -1 , under the irradiation of near-infrared light after 780nm, Ce...

Embodiment 3

[0035] 100mL of Pr(NO 3 ) 3 ·6H 2 O and NH 4 VO 3 Mix in deionized water (both concentrations are 0.01mol / L), ultrasonicate until completely dissolved, add 0.005mol organic template polyvinylpyrrolidone under heating and magnetic stirring conditions, and adjust the pH of the solution to 3 with nitric acid, and then mix the The solution was transferred to a sealed Teflon autoclave, and reacted for 1.5 hours under the condition of microwave hydrothermal heating at 140°C. After naturally cooling to room temperature, the resulting precipitate was collected by centrifugation and washed several times with deionized water. Finally, dry at 80°C for 12 hours to obtain PrVO 4 Two-dimensional nanosheet materials.

[0036] The invention also provides the above material for photocatalytic synthesis of ammonia. Under the full spectrum irradiation of 300W xenon lamp, PrVO 4 The ammonia yield of nanosheets reached 112umolg -1 h -1 , under the irradiation of near-infrared light after...

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Abstract

The invention belongs to the field of two-dimensional material synthesis, and particularly relates to a preparation method and application of a rare earth vanadate two-dimensional nanosheet photocatalytic material. The preparation method comprises the steps: mixing a proper amount of rare earth nitrate and NH4VO3 in deionized water, carrying out ultrasonic treatment till complete dissolution is achieved, adding an organic template agent polyvinylpyrrolidone under heating and magnetic stirring conditions, adjusting the pH value of the solution to 1-4 by using an inorganic acid, then transferring the mixed solution into a high-pressure kettle, and reacting under a microwave hydrothermal condition; and after naturally cooling to room temperature, centrifugally collecting the obtained precipitate, washing, and drying to obtain the rare earth vanadate two-dimensional nanosheet material. According to the invention, the obtained two-dimensional rare earth vanadate has an ultrathin structure and a large specific surface area, provides abundant reaction sites for catalytic reaction, has a good up-conversion effect, fully absorbs and utilizes near-infrared light, and has an excellent effect of synthesizing ammonia by photocatalytic nitrogen fixation.

Description

technical field [0001] The invention belongs to the field of two-dimensional material synthesis, and in particular relates to a preparation method and application of a rare earth vanadate two-dimensional nanosheet photocatalytic material. Background technique [0002] Ammonia (NH 3 ) is one of the most important commodity chemicals in the chemical industry today, and is a key raw material for the synthesis of urea, ammonium nitrate, nitric acid and various nitrogen-containing compounds. In industry, NH 3 N via the Haber-Bosch process 2 Produced by hydrogenation, it consumes about 2% of the global energy consumed by humans each year and releases large amounts of the greenhouse gas CO into the atmosphere 2 . Recently, research in the field of heterogeneous catalysis has shifted its focus to green and sustainable technologies and processes. Currently, there is great interest in developing efficient semiconductor photocatalysts, but the current rate of photocatalytic ammonia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22C01C1/04
CPCB01J23/22C01C1/0411B01J35/39Y02P20/52
Inventor 李霞章姚超吴凤芹左士祥孙利国王灿王亮
Owner 江苏纳欧新材料有限公司
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