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A ZnO photocatalytic material modified with porous carbon and a preparing 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 the problem of insufficient specific surface area of ​​ZnO photocatalysts Unsatisfactory performance stability, weakening ZnO photocatalytic efficiency and other issues, to achieve the effect of improving visible light response, good thermal and chemical stability, and inhibiting recombination

Inactive Publication Date: 2017-11-21
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 ZnO photocatalytic material modified with porous carbon and a preparing method thereof
  • A ZnO photocatalytic material modified with porous carbon and a preparing method thereof
  • A ZnO photocatalytic material modified with porous carbon and a preparing 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 for 1 hour at room temperature, and then allowed to stand for 24 hours. Finally, the obtained solution is centrifuged, washed with methanol and dried at a drying temperature of 80°C, and the obtained white solid is ground into ZIF-8 powder. The ZIF-8 powder was placed in an alumina crucible, covered with a lid and placed in a muffle furnace, heated to 500°C at a heating rate of 5°C per minute and kept at this temperature for 2 hours. The obtained powder is the porous carbon modified ZnO photocatalyst material. The TEM(a) and HRTEM(b) diagrams are as follows figure 2 Shown by figure 2 (a) It can be seen that ZnO is in the form of nanoparticles, with a particle size of several tens of nanometers (mostly not exceeding 50 nm). Because of the cubic sodalite structure of ZIF-8, metal ions are highly dispersed and separated by organic ligan...

Embodiment 2

[0045] The methanol solution of 2-methylimidazole was added dropwise to the methanol solution of zinc nitrate tetrahydrate, magnetically stirred at room temperature for 1 hour, and then allowed to stand for 24 hours. Finally, the obtained solution is centrifuged, washed with methanol and dried at a drying temperature of 80° C., and the obtained white solid is ground into ZIF-8 powder. The ZIF-8 powder was placed in an alumina crucible, covered with a lid and placed in a muffle furnace, heated to 400°C at a heating rate of 5°C per minute and kept at this temperature for 2 hours. The obtained powder is the porous carbon modified ZnO photocatalyst material. Refer to Example 1 for XRD, UV-Vis absorption, specific surface area, pore size and CO 2 Adsorption test, see the results separately image 3 , Figure 7 , Figure 8 with Picture 9 .

Embodiment 3

[0047] The methanol solution of 2-methylimidazole was added dropwise to the methanol solution of zinc nitrate hexahydrate, magnetically stirred for 1 hour at room temperature, and then allowed to stand for 24 hours. Finally, the obtained solution is centrifuged, washed with methanol and dried at a drying temperature of 80°C, and the obtained white solid is ground into ZIF-8 powder. The ZIF-8 powder was placed in an alumina crucible, covered with a lid, and placed in a muffle furnace, heated to 600°C at a heating rate of 5°C per minute and kept at this temperature for 2 hours. The obtained powder is the porous carbon modified ZnO photocatalyst material. Refer to Example 1 for XRD, UV-Vis absorption, specific surface area, pore size and CO 2 Adsorption test, see the results separately image 3 , Figure 7 , Figure 8 with Picture 9 And table 1.

[0048] Table 1

[0049]

[0050]

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

[0052] The above results comprehensively show that ca...

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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 field 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 the search for efficient CO 2 A way to convert into 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 extensively studied by researchers as a photocatalyst due to its excellent structural properties and special photoelectrochemical properties. More importantly, compared to TiO 2 ZnO is a typical direct band gap semiconductor, with 10 times that of TiO 2 In this way, the separation and transfer efficiency of electrons are improved....

Claims

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Application Information

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IPC IPC(8): B01J23/06
CPCB01J23/06B01J35/39B01J35/613B01J35/633B01J35/647
Inventor 刘升卫王加慧余家国
Owner WUHAN UNIV OF TECH
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