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A kind of all crystal heterojunction photocatalytic material and its preparation method and application

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

Active Publication Date: 2021-05-25
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of all crystal heterojunction photocatalytic material and its preparation method and application
  • A kind of all crystal heterojunction photocatalytic material and its preparation method and application
  • A kind of all crystal heterojunction photocatalytic material and its preparation method and application

Examples

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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 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 ad...

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 present invention relates to the technical field of photocatalysis, in particular to an all-crystal heterojunction photocatalytic material and its preparation method and application. The all-crystal heterojunction photocatalytic material provided by the present invention includes Bi 2 S 3 Nanotubes and embedded Bi 2 S 3 WS of nanotubes 2 quantum dot; the Bi 2 S 3 Nanotubes and WS 2 The mass ratio of quantum dots is 100:(1-5). According to the description of the examples, the all-crystalline heterojunction photocatalytic material of the present invention is used to catalyze carbon dioxide, and the yield of methanol is 20.5-29.2 μmol / g cat , the yield of ethanol is 16.6~25.5μmol / g cat .

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, synthetic visible photocatalysts are a hot research topic. As a semiconductor with a narrow band...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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