Composite photocatalyst as well as preparation method and application thereof

A technology of catalyst and composite light, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of poor hydrogen production activity, achieve low cost, improve electron-hole separation efficiency, and operate Simple and convenient effect

Pending Publication Date: 2022-07-01
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the above deficiencies in the prior art, the purpose of the present invention is to provide a composite photocatalyst and its preparation method and application, aiming to solve the problem of poor hydrogen production activity of existing photocatalysts

Method used

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  • Composite photocatalyst as well as preparation method and application thereof
  • Composite photocatalyst as well as preparation method and application thereof
  • Composite photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Fe in this example 2 O 3 / g-C 3 N 4 The preparation steps of the composite photocatalyst are as follows:

[0058] g-C 3 N 4 Preparation of materials: put 10 g of urea in a crucible, and place it in a muffle furnace for calcination at 550°C for 2 hours, with a heating rate of 5°C / min. The calcined product is washed with distilled water, filtered, dried in an oven and ground to obtain g-C 3 N 4 Material.

[0059] Vapor intercalation exfoliation g-C 3 N 4 Materials and Fe 2 O 3 Precursor preparation: 200 mg g-C 3 N 4 The material, 1 g of ammonium chloride and 100 mg of ferric chloride were dissolved in 30 mL of deionized water and sonicated for 10 minutes until uniformly dispersed. It was then placed in a fume hood and heated at 90°C with constant stirring with a glass rod until the precursor was obtained.

[0060] Fe 2 O 3 / g-C 3 N 4 Preparation of composite photocatalyst: The precursor was placed in a porcelain boat, calcined in a muffle furnace at 600...

Embodiment 2

[0062] This example ZnO / g-C 3 N 4 The preparation steps of the composite photocatalyst are as follows:

[0063] g-C 3 N 4 Preparation of materials: put 10 g of urea in a crucible, and place it in a muffle furnace for calcination at 550°C for 2 hours, with a heating rate of 5°C / min. The calcined product is washed with distilled water, filtered, dried in an oven and ground to obtain g-C 3 N 4 Material.

[0064] Vapor intercalation exfoliation g-C 3 N 4 Materials and ZnO precursor preparation: 200 mg g-C 3 N 4 The material, 1.4 g of ammonium nitrate and 75 mg of zinc nitrate were dissolved in 30 mL of deionized water and sonicated for 10 minutes until uniformly dispersed. It was then placed in a fume hood and heated at 75°C with constant stirring with a glass rod until the precursor was obtained.

[0065] ZnO / g-C 3 N 4 Preparation of composite photocatalyst: The precursor was placed in a porcelain boat, calcined at 500 °C for 2 h in a muffle furnace, and the heating ...

Embodiment 3

[0067] This example NiO / g-C 3 N 4 The preparation steps of the composite photocatalyst are as follows:

[0068] g-C 3 N 4 Preparation of materials: put 10 g of urea in a crucible, and place it in a muffle furnace for calcination at 550°C for 2 hours, with a heating rate of 5°C / min. The calcined product is washed with distilled water, filtered, dried in an oven and ground to obtain g-C 3 N 4 Material.

[0069] Vapor intercalation exfoliation g-C 3 N 4 Materials and NiO precursor preparation: 200 mg g-C 3 N 4 The material, 1.3 g of ammonium acetate and 80 mg of nickel acetate were dissolved in 30 mL of deionized water and sonicated for 10 minutes until uniformly dispersed. It was then heated at 80°C in a fume hood with constant stirring with a glass rod until the precursor was obtained.

[0070] NiO / g-C 3 N 4 Preparation of composite photocatalyst: The precursor was placed in a porcelain boat, calcined in a muffle furnace at 600 °C for 2 h, and the heating rate was ...

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Abstract

The invention discloses a composite photocatalyst as well as a preparation method and application thereof. The method comprises the following steps: dissolving a g-C3N4 material, ammonium salt and transition metal salt in water, heating and stirring to obtain a precursor; and calcining the precursor to obtain the transition metal oxide/g-C3N4 nanosheet composite photocatalyst. The preparation method comprises the following steps: peeling a g-C3N4 material through gas phase intercalation to obtain a g-C3N4 nanosheet, loading a transition metal oxide on the g-C3N4 nanosheet through a calcination method, and carrying out secondary peeling on the g-C3N4 nanosheet through water vapor generated by decomposition of the transition metal oxide during calcination to obtain the ultrathin g-C3N4 nanosheet. The method is simple to operate, and the stripping degree can be controlled by adjusting the ammonium salt adding proportion and the heating temperature. The transition metal oxide cocatalyst is simple, convenient and efficient in synthesis method, low in cost and high in carrier mobility, surface hydrogen production active sites are remarkably increased, and the electron hole separation efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of photocatalysts, in particular to a composite photocatalyst and a preparation method and application thereof. Background technique [0002] Hydrogen energy has many advantages as a clean and carbon-free energy source and is an ideal substitute for fossil fuels, but existing industrial technologies are not suitable for producing hydrogen for fuel purposes. The use of solar photocatalytic water splitting to produce hydrogen is considered to be one of the most promising ways to produce hydrogen, which is expected to fundamentally solve the problems of energy shortage and environmental pollution. [0003] Photocatalytic reaction is a reaction process in which solar energy is converted into chemical energy with high energy density and stored in chemical bonds using the structural properties of semiconductors. Semiconductor materials have a discontinuous band structure, ie, a vacant conduction band (CB) with hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/08B01J37/34C01B3/04
CPCB01J27/24B01J35/004B01J35/0013B01J37/082B01J37/343B01J37/088C01B3/042
Inventor 马松
Owner TCL CORPORATION
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