Ternary composite photocatalyst as well as preparation method and application thereof

A photocatalyst and ternary composite technology, applied in the field of photocatalysis, can solve the problems of low activity and low activity of hydrogen production from water splitting, and achieve the effect of improving dissociation and interface migration efficiency and reducing overpotential.

Active Publication Date: 2021-10-22
SHENZHEN INST OF ADVANCED TECH
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AI Technical Summary

Problems solved by technology

As the most stable structure of carbon nitride compounds, graphitic carbon nitride (g-C3N4) has been reported to have visible light photocatalytic activity, however, the activity of pure g-C3N4 to split water into hydrogen is very small, which is due to the photogenerated electrons and The holes in g-C3N4 are easy to recombine quickly and released in the form of heat or light energy, resulting in very little activity of pure g-C3N4 photocatalyst for splitting water to produce hydrogen. Therefore, in order to improve the photocatalytic efficiency of g-C3N4, it is necessary to Modification of g-C3N4 to improve the photocatalytic efficiency of the material

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  • Ternary composite photocatalyst as well as preparation method and application thereof
  • Ternary composite photocatalyst as well as preparation method and application thereof
  • Ternary composite photocatalyst as well as preparation method and application thereof

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[0033] 1. Some embodiments of the present invention provide a method for preparing a novel ternary composite photocatalyst comprising graphite phase carbon nitride, comprising steps:

[0034] (1) Preparation of two-dimensional black phosphorus / transition metal heterojunction.

[0035] (1-1) Preparation of two-dimensional black phosphorus flakes: two-dimensional black phosphorus flakes were prepared by mechanical exfoliation, liquid phase exfoliation, and electrochemical exfoliation to clean blocky black phosphorus crystals.

[0036] The stripping method of bulk black phosphorus is a prior art, therefore, the present invention does not describe this operation too much.

[0037] (1-2) Mix the transition metal salt solution with the two-dimensional black phosphorus flakes to obtain a mixed solution.

[0038] The transition metal cation in the selected transition metal salt solution is any one of all transition metal cations in different valence states. Transition metals include...

Embodiment 1

[0063] (1) Stripping of two-dimensional thin-layer black phosphorus sheets: use bulk black phosphorus as a working electrode, connect it with an inert electrode with a wire, and then immerse it in N containing 0.05M (M is the abbreviation of mol / L) tetrabutylammonium cation. , in N-dimethylformamide electrolyte, after 20V continuous energization for 3min, after cleaning the expanded black phosphorus block several times, 300W ultrasonic vibration for 2min, centrifugation at 500rpm for 3min, after centrifugation, take the supernatant to obtain For the two-dimensional black phosphorus flakes, the obtained two-dimensional black phosphorus flakes were centrifuged at 12000 rpm for 10 min and washed twice with ultrapure water.

[0064] (2) Take 0.5mg of two-dimensional black phosphorus flakes and add 1mL of 0.005M NiCl 2 solution, add 4 mL of ultrapure water to form a mixed solution. Add a small magnet to the quartz tube containing the obtained mixed solution, seal the quartz tube w...

Embodiment 2

[0069] (1) Stripping of two-dimensional thin-layer black phosphorus sheets: use bulk black phosphorus as a working electrode, connect it with an inert electrode with a wire, and then immerse it in N,N-dimethylformamide containing 0.05M tetrabutylammonium cation for electrolysis In the solution, after 20V continuous power-on for 3min, after cleaning the expanded black phosphorus block several times, 300W ultrasonic vibration for 2min, and centrifugation at 500rpm for 3min, after centrifugation, take the supernatant to obtain two-dimensional black phosphorus flakes. The two-dimensional black phosphorus flakes were centrifuged at 12000rpm for 10min and washed twice with ultrapure water.

[0070] (2) Take 0.5mg of two-dimensional black phosphorus flakes and add 1mL of 0.005M CoCl 2 solution, add 4 mL of ultrapure water to form a mixed solution. Add a small magnet to the quartz tube containing the obtained mixed solution, seal the quartz tube with a rubber stopper and paraffin; us...

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Abstract

The invention discloses a ternary composite photocatalyst as well as a preparation method and application thereof, wherein the ternary composite photocatalyst comprises graphite phase carbon nitride and a two-dimensional black phosphorus/transition metal heterojunction which are mixed with each other, and the two-dimensional black phosphorus/transition metal heterojunction comprises a two-dimensional black phosphorus sheet and transition metal particles loaded on the two-dimensional black phosphorus sheet. Transition metal particles (TM) are loaded on the surface of a two-dimensional black phosphorus (BP) sheet to serve as a cocatalyst, which can serve as capture sites of photon-generated carriers to improve the dissociation and interface migration efficiency of the carriers and can also serve as active sites of an oxidation-reduction reaction to reduce the overpotential of a photocatalytic reaction, and the photocatalytic efficiency of graphite-phase carbon nitride is effectively improved.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a ternary composite photocatalyst, a preparation method and application thereof. Background technique [0002] With the rapid growth of population and economy, the world's energy consumption has doubled, which has accelerated the depletion of fossil fuels. It is urgent to develop new energy sources to replace fossil fuels. Among new clean energy sources, hydrogen energy is generally considered to be an ideal, pollution-free green energy source because the only product of hydrogen combustion is water. However, the traditional method of hydrogen production consumes a lot of energy, making hydrogen expensive, which seriously limits the wide application of hydrogen energy in various industries. Sunlight is a renewable energy source. Hydrogen is obtained from water through light and used as energy, and then returns to the form of water. Clean and environmentally friendly has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01B3/04
CPCB01J35/004B01J27/24C01B3/042C01B2203/0277C01B2203/1058C01B2203/1052C01B2203/107C01B3/04
Inventor 喻学锋杨娜温敏王佳宏
Owner SHENZHEN INST OF ADVANCED TECH
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