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Full-crystal heterojunction photocatalysis material and preparation method and application thereof

A photocatalytic material and heterojunction technology, applied in the field of photocatalysis, can solve the problems of high recombination rate of photogenerated carriers and low catalytic efficiency

Active Publication Date: 2019-07-05
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although simple Bi 2 S 3 Can photocatalyze CO 2 Converted to methanol, but pure bismuth sulfide materials have the disadvantages of high recombination rate of photogenerated carriers and low catalytic efficiency

Method used

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  • Full-crystal heterojunction photocatalysis material and preparation method and application thereof
  • Full-crystal heterojunction photocatalysis material and preparation method and application thereof
  • Full-crystal heterojunction photocatalysis material and preparation method and application thereof

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preparation example Construction

[0031] The present invention also provides a method for preparing the all-crystal heterojunction photocatalytic material described in the above technical solution, comprising the following steps:

[0032] Mixing a bismuth nitrate solution and a sodium sulfide solution to obtain a mixed solution containing a precursor;

[0033] The mixed solution containing precursor, urea solution and WS 2 The quantum dot solution is mixed, and the hydrothermal reaction is carried out to obtain the all-crystal heterojunction photocatalytic material.

[0034] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0035] The present invention mixes bismuth nitrate solution and sodium sulfide solution to obtain a mixed solution containing a precursor; in the present invention, the solvent of the bismuth nitrate solution is preferably glycerol; the solute is preferably bismuth nitrate pentahyd...

Embodiment 1

[0058] 0.34gNa 2 WO 4 2H 2 O was dissolved in 25mL water, and the pH=6 was adjusted with HCl solution to obtain a sodium tungstate solution;

[0059] Dissolve 0.5g L-cysteine ​​in 50mL water, add it to sodium tungstate solution, ultrasonicate for 10min, carry out hydrothermal reaction (180°C, 36h), cool to room temperature, dialyze the product 4 times with a 200D dialysis bag, and depressurize Rotary evaporation, to obtain 5mg / mL of WS 2 Quantum dot solution;

[0060] 0.73gBi(NO 3 ) 3 ·5H 2 O was added in 5mL glycerol, stirred completely to dissolve, and obtained bismuth nitrate solution;

[0061] 1.5gNa 2 S·9H 2 O was dissolved in 10mL deionized water to obtain a sodium sulfide solution;

[0062] Dropping the sodium sulfide solution into the bismuth nitrate solution drop by drop, stirring to obtain a mixed solution containing a precursor;

[0063] 0.76gCO(NH 2 ) 2 Dissolve in 15mL deionized aqueous solution to obtain urea solution;

[0064] The urea solution is ...

Embodiment 2～5

[0066] The difference between Embodiments 2-5 and Embodiment 1 is only that WS 2 The addition amount of quantum dot solution;

[0067] WS in Examples 2-5 2 The amount of quantum dot solution added is: according to WS 2 Quantum dots and Bi 2 S 3 Theoretical mass ratios of materials were added in 2%, 3%, 4% and 5% respectively.

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Abstract

The invention relates to the technical field of photocatalysis, in particular to a full-crystal heterojunction photocatalysis material and a preparation method and application thereof. The full-crystal heterojunction photocatalysis material comprises a Bi2S3 nanotube and a WS2 quantum point embedded into the Bi2S3 nanotube; the mass ratio of the Bi2S3 nanotube to the WS2 quantum point is 100:(1-5). According to the embodiment, the full-crystal heterojunction photocatalysis material is used for catalyzing carbon dioxide, the yield of generated methyl alcohol is 20.5-29.2 micromol / gcat, and theyield of ethyl alcohol is 16.6-25.5 micromol / gcat.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to an all-crystal heterojunction photocatalytic material and its preparation method and application. Background technique [0002] At present, the global warming caused by the room temperature effect is becoming more and more serious, and carbon dioxide is the main greenhouse effect gas. Reducing the amount of carbon dioxide in the air is the key to controlling the greenhouse effect. Therefore, more and more people are now paying attention to the conversion of carbon dioxide into organic fuels through solar energy and photocatalysts. This method can not only reduce the content of carbon dioxide but also generate useful fuel resources for human use, and solve the current shortage of fossil fuels. [0003] Utilize solar energy resources and reduce CO 2 Converting to organic fuels and synthesizing new visible light catalysts is a hotspot of research. As a semiconductor with a ...

Claims

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Application Information

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IPC IPC(8): B01J27/047C07C31/04C07C29/153C07C31/08
CPCB01J27/047C07C29/153B01J35/39C07C31/04C07C31/08Y02P20/52
Inventor 代威力熊悟琬罗胜联罗旭彪杨丽霞邹建平
Owner NANCHANG HANGKONG UNIVERSITY
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