Porous sheet assembled three-dimensional NiO porous sphere and synthetic method thereof

A synthesis method and porous sheet technology, applied in the field of nanomaterials, can solve the problems of reduced surface active sites and catalytic activity, easy aggregation, and large specific surface energy of two-dimensional nanosheets, achieving low cost, improved diffusion efficiency, and difficult Aggregated effect

Active Publication Date: 2019-07-12
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ultrathin 2D nanosheets tend to aggregate due to their large specific surface energy, resulting in reduced surface active sites and catalytic activity.

Method used

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  • Porous sheet assembled three-dimensional NiO porous sphere and synthetic method thereof
  • Porous sheet assembled three-dimensional NiO porous sphere and synthetic method thereof
  • Porous sheet assembled three-dimensional NiO porous sphere and synthetic method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A method for synthesizing three-dimensional NiO porous spheres with porous sheet assembly: comprising the following steps

[0022] a. Dissolve 0.0290g of nickel nitrate hexahydrate and 0.0123g of isonicotinic acid in a mixed solution of N,N-dimethylformamide (9mL), absolute ethanol (5mL), deionized water (1mL), and stir Evenly, transfer the above mixed solution to an autoclave, and react in a 25mL polytetrafluoroethylene autoclave, heat to 150°C, and the reaction time is 6h;

[0023] b. Collect the product by centrifugation, then wash the product several times with absolute ethanol, and dry it in an oven overnight to obtain the isonicotinic acid coordination compound precursor of nickel. The SEM image is as follows figure 1 As shown in a, it can be seen from the scanning electron microscope that the obtained product is a porous ball structure assembled by smooth sheets, and the size of the porous spherical precursor is relatively uniform. XRD picture as shown figure 1...

Embodiment 2

[0026] A method for synthesizing three-dimensional NiO porous spheres with porous sheet assembly: comprising the following steps

[0027] a. Dissolve 0.0290g of nickel nitrate hexahydrate and 0.0123g of isonicotinic acid in a mixed solution of N,N-dimethylformamide (9mL), absolute ethanol (5mL), deionized water (1mL), and stir Evenly, transfer the above mixed solution to an autoclave, and react in a 25mL polytetrafluoroethylene autoclave, heat to 130°C, and the reaction time is 6h;

[0028] b. Collect the product by centrifugation, then wash the product several times with absolute ethanol, and dry it in an oven overnight to obtain the nickel isonicotinic acid coordination compound precursor;

[0029] c. Carry out high-temperature calcination on the obtained precursor in a vacuum atmosphere, the calcination temperature is 450°C, and the time is 2h. The SEM image of the obtained product is as follows Figure 4 As shown in a, from Figure 4 a It can be seen that the obtained pr...

Embodiment 3

[0031] A method for synthesizing a three-dimensional NiO porous sphere with porous sheet assembly: comprising the following steps

[0032] a. Dissolve 0.0290g of nickel nitrate hexahydrate and 0.0123g of isonicotinic acid in a mixed solution of N,N-dimethylformamide (9mL), absolute ethanol (5mL), deionized water (1mL), and stir Evenly, transfer the above mixed solution to an autoclave, and react in a 25mL polytetrafluoroethylene autoclave, heat to 160°C, and the reaction time is 4h;

[0033] b. Collect the product by centrifugation, then wash the product several times with absolute ethanol, and dry it in an oven overnight to obtain the nickel isonicotinic acid coordination compound precursor;

[0034] c. Carry out high-temperature calcination on the obtained precursor in a vacuum atmosphere, the calcination temperature is 550°C, and the time is 1h. The SEM image of the obtained product is as follows Figure 4 As shown in b, from Figure 4 b It can be seen that the obtained p...

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PUM

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Abstract

The invention discloses a synthetic method of porous sheet assembled three-dimensional NiO porous spheres. The synthetic method comprises the following steps: taking nickel nitrate hexahydrate and isonicotinic acid, dissolving nickel nitrate hexahydrate and isonicotinic acid into a mixed solution of N,N-dimethylformamide solution, ethanol and water, uniformly stirring and transferring the mixed solution to a 25mL polytetrafluoroethylene high-pressure reaction still for reaction; carrying out centrifugal separation and collecting a product, and washing the product with absolute ethyl alcohol for several times to obtain an isonicotinic acid coordination compound of nickel; calcining the obtained precursor in a vacuum atmosphere to obtain a NiO porous material with a three-dimensional structure. The synthetic method disclosed by the invention is simple in process and low in cost. The prepared three-dimensional NiO porous spheres are assembled by taking ultra-thin 2D nanosheets as a subunit, has the advantages of ultra-thin nanosheets, and also can expose more active sites for catalytic reaction; in addition, the sheets are not easy to aggregate in the reaction process; interconnectedmesopores in the three-dimensional structure can improve the diffusion efficiency of reaction molecules, improve the utilization efficiency of internal sheets and improve the performance of materials.

Description

technical field [0001] The invention relates to nanometer materials, in particular to a three-dimensional NiO porous ball assembled from porous sheets and a synthesis method thereof. Background technique [0002] NiO, as a p-type wide bandgap semiconductor, is non-toxic, has excellent chemical stability and good photocatalytic and photoelectrochemical properties, so it has been widely studied. Common NiO nanoparticles have a low surface-active site ratio, while large interfacial areas lead to slow charge carrier transport, thereby inducing rapid recombination of photogenerated carriers. Therefore, scientists hope to synthesize nickel oxide photocatalysts with porous, large specific surface and high proportion of active sites through rational experimental design to expand its application in the field of photocatalysis. Ultrathin two-dimensional nanosheet materials have the potential of high-efficiency photocatalysts due to their high specific surface area, which can provide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J35/08B01J35/10
CPCB01J23/755B01J35/08B01J35/10
Inventor 韩锡光袁玉胜展雯雯
Owner XUZHOU NORMAL UNIVERSITY
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