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A kind of porous carbon modified zno photocatalytic material and preparation method thereof

A technology of photocatalytic materials and porous carbon, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve unsatisfactory stability of photocatalytic performance , The specific surface area of ​​ZnO photocatalyst is not large enough, and the photocatalytic efficiency of ZnO is weakened, so as to achieve the effect of improving visible light response, good thermal and chemical stability, and inhibiting recombination

Inactive Publication Date: 2020-05-05
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, traditional ZnO is a wide bandgap (Eg=3.2eV) photocatalyst, which can only photocatalytically reduce CO under ultraviolet light irradiation. 2 Reaction, we all know that ultraviolet light only accounts for 5% of sunlight, while visible light accounts for 40% of sunlight, obviously, this will greatly weaken the overall photocatalytic efficiency of ZnO
At the same time, the stability in terms of photocatalytic performance is not satisfactory.
Moreover, the specific surface area of ​​ZnO photocatalysts reported in the literature is not large enough to capture CO efficiently. 2 reactive molecule
This greatly limits its photocatalytic reduction of CO 2 practical applications in the field

Method used

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  • A kind of porous carbon modified zno photocatalytic material and preparation method thereof
  • A kind of porous carbon modified zno photocatalytic material and preparation method thereof
  • A kind of porous carbon modified zno photocatalytic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The methanol solution of 2-methylimidazole was added dropwise to the methanol solution of zinc nitrate hexahydrate, magnetically stirred at room temperature for 1 h, and then left to age for 24 h. Finally, the obtained solution was centrifuged, washed with methanol and then dried at a drying temperature of 80° C., and the obtained white solid was ground to obtain ZIF-8 powder. Put the ZIF-8 powder in an alumina crucible, cover it and place it in a muffle furnace, heat it to 500°C at a rate of 5°C per minute and keep it at this temperature for 2 hours. The obtained powder is the porous carbon modified ZnO photocatalyst material. Its TEM(a) and HRTEM(b) pictures are as follows figure 2 shown by figure 2 (a) It can be seen that ZnO is in the form of nanoparticles, and its particle size is tens of nanometers (most of which do not exceed 50nm). Because of the cubic sodalite structure of ZIF-8, the metal ions are highly dispersed and separated by the connection of organi...

Embodiment 2

[0045] The methanol solution of 2-methylimidazole was added dropwise to the methanol solution of zinc nitrate tetrahydrate, magnetically stirred for 1 h at room temperature, and then left to age for 24 h. Finally, the obtained solution was centrifuged, washed with methanol and then dried at a drying temperature of 80° C., and the obtained white solid was ground to obtain ZIF-8 powder. Put the ZIF-8 powder in an alumina crucible, cover it and place it in a muffle furnace, heat it to 400°C at a rate of 5°C per minute and keep it at this temperature for 2 hours. The obtained powder is the porous carbon modified ZnO photocatalyst material. Reference Example 1 carries out XRD, ultraviolet-visible light absorption, specific surface area, aperture and CO 2 Adsorption test, the results are shown in image 3 , Figure 7 , Figure 8 and Figure 9 .

Embodiment 3

[0047] The methanol solution of 2-methylimidazole was added dropwise to the methanol solution of zinc nitrate hexahydrate, magnetically stirred at room temperature for 1 h, and then left to age for 24 h. Finally, the obtained solution was centrifuged, washed with methanol and then dried at a drying temperature of 80° C., and the obtained white solid was ground to obtain ZIF-8 powder. Put the ZIF-8 powder in an alumina crucible, cover it and place it in a muffle furnace, heat it to 600°C at a rate of 5°C per minute and keep it at this temperature for 2 hours. The obtained powder is the porous carbon modified ZnO photocatalyst material. Reference Example 1 carries out XRD, ultraviolet-visible light absorption, specific surface area, aperture and CO 2 Adsorption test, the results are shown in image 3 , Figure 7 , Figure 8 and Figure 9 and Table 1.

[0048] Table 1

[0049]

[0050]

[0051] PV: pore volume; APS: average pore size

[0052] The above results compr...

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Abstract

The invention relates to a ZnO photocatalytic material modified with porous carbon and a preparing method thereof. The ZnO photocatalytic material modified with porous carbon includes zinc oxide nanometer particles and amorphous porous nanometer carbon. The zinc oxide nanometer particles are covered with the amorphous porous nanometer carbon largely or the amorphous porous nanometer carbon is doped in gaps among the zinc oxide nanometer particles largely. The method has characteristics of a simple preparing process, mild reaction conditions, easy control, and the like. The material has a high specific surface area, high CO2 adsorptivity, visible-light response and charge transfer capabilities, effectively overcomes disadvantages which are a small specific surface area, a high photo-induced electron hole pair recombination rate and a low photocatalytic efficiency of a single zinc oxide photocatalyst, greatly increases the solar energy utilization efficiency, and has a wide application prospect in the fields of photocatalysis, electrochemistry, energy, environment, and the like.

Description

technical field [0001] The invention relates to a porous carbon-modified ZnO photocatalytic material and a preparation method thereof, belonging to the fields of material preparation and energy environment. Background technique [0002] With the shortage of fossil fuels and the continuous increase of carbon dioxide emissions, we urgently need to find new clean energy, especially to explore efficient CO 2 Ways to convert to new clean energy. Many photocatalysts, such as TiO 2 , ZnO, CdS, ZnGa 2 o 4 , g-C 3 N 4 and other semiconductors have been used to study the photocatalytic reduction of CO 2 field. In the past 30 years of research, ZnO has been widely studied as a photocatalyst due to its excellent structural characteristics and special photoelectrochemical properties. More importantly, compared to TiO 2 , ZnO is a typical direct bandgap semiconductor with 10 times that of TiO 2 Electron activity, so that the separation and transfer efficiency of electrons are im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/06
CPCB01J23/06B01J35/004B01J35/1014B01J35/1038B01J35/1061
Inventor 刘升卫王加慧余家国
Owner WUHAN UNIV OF TECH
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