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High-selectivity solar-driven carbon dioxide conversion composite material and preparation thereof

A nano-composite material, carbon-nitrogen compound technology, applied in the direction of carbon monoxide, physical/chemical process catalyst, energy input, etc., can solve the problems of instability of black phosphorus nanosheets, limited photocatalytic activity, and unfavorable industrial application, and achieves the improvement of electronic The effect of transmission efficiency, strong sunlight absorption ability, and good prospects for large-scale industrial application

Pending Publication Date: 2021-11-19
SUZHOU UNIV OF SCI & TECH
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Problems solved by technology

Therefore, the construction of black phosphorus / graphite carbon nitride heterostructure can effectively improve the photocatalytic activity, but the black phosphorus nanosheets are extremely unstable in the environment and easy to oxidize, thus limiting their photocatalytic activity.
In addition, there are many products in the solar-driven carbon dioxide conversion process, which is not conducive to its industrial application

Method used

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  • High-selectivity solar-driven carbon dioxide conversion composite material and preparation thereof
  • High-selectivity solar-driven carbon dioxide conversion composite material and preparation thereof
  • High-selectivity solar-driven carbon dioxide conversion composite material and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1. Preparation of two-dimensional black phosphorus materials

[0045] Disperse 20mg of bulk black phosphorus material into 25mL N-methylpyrrolidone, and use a cell disruptor to ultrasonically pulverize for 3 days with a power of 160W to obtain a two-dimensional black phosphorus N-methylpyrrolidone solution.

[0046] figure 1 It is a TEM image of two-dimensional black phosphorus. It can be seen from the picture that the black phosphorus presents a thin sheet structure.

[0047] 2. Preparation of cobalt phosphide@black phosphorus nanosheets

[0048] Take 10mL N-methylpyrrolidone solution of two-dimensional black phosphorus, wash it three times with N,N-dimethylformamide solution to obtain 10mL N,N-dimethylformamide solution of two-dimensional black phosphorus, add 35.6 1 mg of cobalt(II) acetylacetonate was uniformly dispersed and added to the reaction kettle, and argon gas was introduced into the reaction kettle, and then heated at 180°C for 4 hours. After the screenin...

Embodiment 2

[0057] A photocatalytic reactor is used for the photocatalytic reduction of carbon dioxide: 10mg embodiment 1 is prepared based on cobalt phosphide@black phosphorus / graphite phase carbon nitride nanocomposite material and 12mL mixed solution (acetonitrile: deionized water: triethanolamine= 3:2:1) After mixing evenly, put it into the photocatalytic reactor, pass condensed water to keep the temperature at 5°C, turn on the xenon lamp light source, pass in carbon dioxide to make the internal pressure of the reaction system reach 80kPa, and start the solar-driven carbon dioxide conversion reaction ; The cobalt phosphide@black phosphorus / graphite phase carbon nitride nanocomposite material has high carbon dioxide reduction efficiency and selectivity to carbon monoxide.

[0058] Figure 5 and Figure 6 Production of carbon monoxide (CO) and methane (CH 4 ) renderings. Figure 7 Selectivity effect diagram for solar-driven carbon dioxide conversion, Figure 8 Schematic diagram of t...

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Abstract

The invention relates to a high-selectivity solar-driven carbon dioxide conversion composite material and preparation thereof, and belongs to the field of environment and new energy materials. The preparation method comprises the following steps: stripping a blocky black phosphorus material into two-dimensional black phosphorus nanosheets by a solvent stripping method; adding a precursor of cobalt phosphide into the black phosphorus nanosheet solution, uniformly dispersing, and preparing cobalt phosphide@black phosphorus under the protection of inert gas; preparing thin-layer graphite-phase carbon nitride nanosheets by taking a carbon-nitrogen compound as a precursor through high-temperature calcination and a thermal stripping method; and finally, compounding the graphite phase carbon nitride nanosheets with the black phosphorus@cobalt phosphide sheets by adopting a self-assembly method to obtain the cobalt phosphide@black phosphorus / graphite phase carbon nitride nano composite material. The cobalt phosphide@black phosphorus / graphite-phase carbon nitride nano composite material prepared by the invention has good carbon dioxide reduction performance under an illumination condition. The method has the advantages of simple synthesis steps, high selectivity of produced carbon monoxide and the like, and has a good industrial application prospect in the aspects of carbon dioxide emission reduction and clean energy production.

Description

technical field [0001] The invention relates to the technical field of environment and new energy materials, in particular to a composite material for carbon dioxide conversion driven by high-selectivity solar energy and its preparation. Background technique [0002] Due to the excessive consumption of fossil fuels, atmospheric carbon dioxide (CO 2 ) concentration has been increasing and has exceeded 400ppm, causing global energy crisis and ecological environment problems. In order to solve the above problems, my country has recently proposed a series of countermeasures, such as "carbon peak" and "carbon neutral" goals, and vigorously develop clean new energy. Therefore, reducing the content of carbon dioxide while developing clean energy has become one of the problems to be solved urgently in the world. At present, using solar energy to drive the conversion of carbon dioxide into high-value fuels or chemicals based on semiconductor materials has become a practical method....

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10C01B32/40
CPCB01J27/24C01B32/40B01J35/61B01J35/39Y02P20/133
Inventor 胡俊蝶阳婷玉李长明
Owner SUZHOU UNIV OF SCI & TECH
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