Gold nanoparticle-loaded cerium dioxide nanosheet material as well as synthesis method and application thereof

A technology of gold nanoparticles and ceria, applied in the field of nanomaterial preparation and carbon monoxide oxidation catalytic reaction, can solve the problem of difficulty in synthesizing two-dimensional ceria nanosheets

Inactive Publication Date: 2021-05-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still great challenges in the synthesis of 2D ceria nanosheets
Because the cerium oxide crystal structure is not layered, but a typical fluorite structure, the space group is Fm3m (Jiang, S, et al. Promoting Formation of Oxygen Vacancies in Two-Dimensional Cobalt-Doped Ceria Nanosheets for Efficient Hydrogen Evolution. J Am Chem Soc 2020, 142(14), 6461-6466.), traditional methods for preparing two-dimensional materials, such as ultrasonic exfoliation, hydrothermal method, etc., are difficult to synthesize uniform two-dimensional cerium oxide nanosheets

Method used

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  • Gold nanoparticle-loaded cerium dioxide nanosheet material as well as synthesis method and application thereof
  • Gold nanoparticle-loaded cerium dioxide nanosheet material as well as synthesis method and application thereof
  • Gold nanoparticle-loaded cerium dioxide nanosheet material as well as synthesis method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042]A kind of synthetic method of gold nanoparticle loaded on ceria nano sheet material, can refer to figure 1 shown, including the following steps:

[0043] (1) Add 50mg graphene oxide into 50ml water, ultrasonically disperse evenly (the time is 15min), then add 2.5mmol cerium nitrate, stir and process (the time is 120min, the speed is 900r / min), centrifuge to take the precipitate (the speed is 9000r / min) min), washed 3 times with deionized water to obtain the precursor;

[0044] (2) Add the precursor described in step (1) into 15ml of water, and disperse evenly by ultrasonic (the time of ultrasonic is 20min), to obtain the precursor dispersion liquid, carry out freezing treatment with liquid nitrogen (time is 10-20s), at a temperature of Freeze-drying at -50°C for 3 days to obtain a dried product; heating the dried product for calcination treatment, the temperature of the calcination treatment was 400°C, the time of the calcination treatment was 2 hours, and the atmospher...

Embodiment 2

[0047] (1) Add 100mg graphene oxide into 50ml water, ultrasonically disperse evenly (time is 15min), then add 5mmol cerium nitrate, stir treatment (time is 120min, speed is 900r / min), centrifuge to take the precipitate (speed is 9000r / min ), washed 3 times with deionized water to obtain the precursor;

[0048] (2) Add the precursor described in step (1) into 15ml of water, and disperse evenly by ultrasonic (the time of ultrasonic is 20min), to obtain the precursor dispersion liquid, carry out freezing treatment with liquid nitrogen (time is 10-20s), at a temperature of Freeze-drying at -50°C for 3 days to obtain a dried product; the dried product was heated up for calcination treatment, the temperature of the calcination treatment was 400°C, the time of the calcination treatment was 4 hours, and the atmosphere of the calcination treatment was air atmosphere to obtain two Dimensional ceria nanosheets;

[0049] (3) Mix 675 μl polyvinyl alcohol solution (concentration is 0.5wt%)...

Embodiment 3

[0051] (1) Add 100mg graphene oxide into 50ml water, ultrasonically disperse evenly (the time is 15min), then add 2.5mmol cerium nitrate, stir and process (the time is 120min, the rotating speed is 900r / min), and the precipitate is collected by centrifugation (the rotating speed is 9000r / min) min), washed 3 times with deionized water to obtain the precursor;

[0052] (2) Add the precursor described in step (1) into 15ml of water, and disperse evenly by ultrasonic (the time of ultrasonic is 20min), to obtain the precursor dispersion liquid, carry out freezing treatment with liquid nitrogen (time is 10-20s), at a temperature of Freeze-drying at -50°C for 3 days to obtain a dried product; the dried product was heated up for calcination treatment, the temperature of the calcination treatment was 600°C, the time of the calcination treatment was 4h, and the atmosphere of the calcination treatment was air atmosphere, to obtain two Dimensional ceria nanosheets;

[0053] (3) Mix 675 μ...

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Abstract

The invention discloses a gold nanoparticle-loaded cerium dioxide nanosheet material as well as a synthesis method and application of the material. The method comprises the following steps: adding graphene oxide into water, uniformly conducting dispersing, adding cerium nitrate, and conducting stirring to obtain a precursor; adding the precursor into water to obtain a precursor dispersion liquid, and freezing and drying the precursor dispersion liquid with liquid nitrogen to obtain a dried product; raising the temperature and carrying out calcination treatment to obtain a two-dimensional cerium oxide nanosheet; and adding a polyvinyl alcohol solution and a chloroauric acid solution into water, adding a sodium borohydride solution, uniformly conducting mixing to obtain a mixed solution, adding a two-dimensional cerium oxide nanosheet into the mixed solution, conducting stirring and filtering, and taking a precipitate to obtain the gold nanoparticle-loaded cerium dioxide nanosheet material. The synthesized gold nanoparticle-loaded cerium dioxide nanosheet has a large specific surface area and high-concentration Ce<3+>, the concentration of oxygen vacancies on the surface of cerium oxide is improved, and the gold nanoparticle-loaded cerium dioxide nanosheet shows excellent catalytic performance when being used for catalyzing a carbon monoxide oxidation reaction and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation and carbon monoxide oxidation catalytic reaction, and specifically relates to a gold nanoparticle loaded on ceria nanosheet material and its synthesis method and application. Background technique [0002] Cerium oxide has excellent redox ability, oxygen storage and oxygen exchange ability, and is an important rare earth material, which is widely used in automobile exhaust treatment, fuel cells, gas sensors, polishing agents and other fields. In recent years, a large number of researchers have synthesized cerium oxide nanomaterials with various shapes (particles, cubes, rods, wires, flowers, spheres, flakes), which are widely used in methane due to their special physical and chemical properties. Reforming, CO oxidation, water gas shift and other reactions. A large number of studies have shown that the performance of catalytic reactions such as CO oxidation and water-gas shift is r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/66B01J35/02B01J35/10B01D53/86B01D53/62
CPCB01D53/864B01J23/66B01J35/023B01J35/026B01J35/1019Y02A50/20
Inventor 梁振兴吕建广谭爱东
Owner SOUTH CHINA UNIV OF TECH
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