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Two-dimensional nonmetal photocatalytic composite and preparation method and application thereof

A composite material and photocatalytic technology, which is applied in the field of two-dimensional non-metallic photocatalytic composite materials and its preparation, can solve the problems of difficult to achieve photocatalytic hydrogen production efficiency, low utilization rate of visible light, small specific surface area of ​​materials, etc., and achieve improved separation and transmission, low cost, simple preparation process

Inactive Publication Date: 2019-05-10
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the small specific surface area of ​​CN bulk materials, slightly larger band gap, and low utilization of visible light make it difficult to achieve higher photocatalytic hydrogen production efficiency.

Method used

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  • Two-dimensional nonmetal photocatalytic composite and preparation method and application thereof
  • Two-dimensional nonmetal photocatalytic composite and preparation method and application thereof
  • Two-dimensional nonmetal photocatalytic composite and preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0051] The present invention also provides a method for preparing the above-mentioned two-dimensional non-metallic photocatalytic composite material, which includes the following steps:

[0052] Red phosphorus and an organic solvent are mixed to obtain a suspension, and the suspension undergoes a hydrothermal reaction under certain temperature and pressure conditions to obtain the two-dimensional non-metallic photocatalytic composite material. The hydrothermal method adopted by the preparation method can realize rapid conversion between different crystal phases of the same element.

[0053] As a preferred embodiment, the concentration of the suspension is 5 to 37.5 g / L, so that the red phosphorus can be fully dispersed in the solvent.

[0054] As a preferred embodiment, the temperature of the hydrothermal reaction is 120-200°C; within this temperature range, red phosphorus can undergo a phase transition to transform into black phosphorus.

[0055] As a preferred embodiment, the time f...

Embodiment approach

[0062] As a preferred embodiment, the photocatalytic total water splitting includes the following steps:

[0063] The two-dimensional non-metallic photocatalytic composite material and water are mixed ultrasonically to obtain a reaction liquid; an inert gas is introduced, and the product is irradiated with a light source.

[0064] As a preferred embodiment, the ultrasound time is not less than 30 minutes, so that the catalyst is well dispersed in the water, which is beneficial for the catalyst to activate water molecules.

[0065] As a preferred embodiment, the inert gas is argon.

[0066] As a preferred embodiment, the light source is a 200W xenon lamp, and the light intensity of the xenon lamp is relatively stable, which reduces the influence of unstable light intensity on the evaluation of catalyst activity.

[0067] As a preferred embodiment, the product includes hydrogen and hydrogen peroxide.

[0068] In the present invention, the preparation methods are conventional methods unless...

Embodiment 1

[0072] The preparation of the two-dimensional non-metallic photocatalytic composite material includes the following steps:

[0073] Weigh 800mg of red phosphorus and add it to 40ml of ethylenediamine and stir evenly to obtain a suspension. Transfer the suspension to a 50ml autoclave for sealing; heat the suspension in the autoclave at 140°C The hydrothermal reaction is carried out for 12 hours under the conditions; the product after the reaction is centrifuged, washed with deionized water and ethanol successively, washed three times, and dried in vacuum. The obtained material is a two-dimensional non-metallic photocatalytic composite material.

[0074] figure 1 This embodiment is a flow chart for preparing a two-dimensional non-metallic photocatalytic composite material;

[0075] figure 2 This is the X-ray diffraction pattern of the two-dimensional non-metallic photocatalytic composite material prepared in this example. The resulting spectrum has a peak consistent with the pure phas...

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Abstract

The invention discloses a two-dimensional nonmetal photocatalytic composite and a preparation method and application thereof. The two-dimensional nonmetal photocatalytic composite is formed by combining two phosphorus allotropes, black phosphorus and red phosphorus, wherein the two-dimensional nonmetal photocatalytic composite is a direct Z-type heterojunction material. The invention also providesa preparation method of the two-dimensional nonmetal photocatalytic composite, which comprises the steps of mixing red phosphorus and an organic solvent to obtain a suspension, and subjecting the suspension to hydrothermal reaction at a certain temperature to obtain the two-dimensional nonmetal photocatalytic composite. The invention also provides application of the two-dimensional nonmetal photocatalytic composite in photocatalytic full decomposition of water. The two-dimensional nonmetal photocatalytic composite provided herein can ensure a wide light response range and provide better separation and transport of photo-generated carriers, and is a two-dimensional nonmetal photocatalyst material with high photocatalytic activity.

Description

Technical field [0001] The invention relates to the technical field of photocatalytic two-dimensional non-metallic nano materials. More specifically, it relates to a two-dimensional non-metallic photocatalytic composite material and its preparation method and application. Background technique [0002] Energy shortage and environmental pollution have become two major issues that restrict the development of human society. In order to meet this challenge, the development and utilization of new clean and renewable energy is extremely urgent. As an inexhaustible clean energy, solar energy is an ideal substitute for fossil energy and will occupy an important position in the future energy structure. The use of solar energy for photocatalytic decomposition of water to produce hydrogen is one of the effective methods that are expected to solve the problem of energy depletion. However, the catalytic efficiency and cost issues greatly limit its application in actual industrial production....

Claims

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Application Information

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IPC IPC(8): B01J27/14C01B3/04
Inventor 陈勇刘福来石睿
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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