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Composite photocatalyst for producing hydrogen peroxide as well as preparation method and application thereof

A technology for producing hydrogen peroxide and recombining light, which is applied in the field of photocatalysis to achieve the effects of high photogenerated electron-hole separation efficiency, strong photocatalytic redox ability, and high light absorption efficiency

Active Publication Date: 2020-05-29
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, the application of bismuth oxybromide composite photocatalysts with oxygen vacancies modified by nitrogen-doped carbon quantum dots for the production of hydrogen peroxide has not been reported.

Method used

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  • Composite photocatalyst for producing hydrogen peroxide as well as preparation method and application thereof
  • Composite photocatalyst for producing hydrogen peroxide as well as preparation method and application thereof
  • Composite photocatalyst for producing hydrogen peroxide as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] A bismuth oxybromide composite photocatalyst with oxygen vacancies modified by nitrogen-doped carbon quantum dots, the bismuth oxybromide composite photocatalyst with oxygen vacancies modified by nitrogen-doped carbon quantum dots is supported by bismuth oxybromide with oxygen vacancies , Bismuth oxybromide is decorated with nitrogen-doped carbon quantum dots.

[0074] In this embodiment, the volume of the nitrogen-doped carbon quantum dot dispersion in the nitrogen-doped carbon quantum dot-modified bismuth oxybromide composite photocatalyst with oxygen vacancies is 6 mL.

[0075] In this embodiment, the nitrogen-doped carbon quantum dot-modified bismuth oxybromide composite photocatalyst with oxygen vacancies is a sheet material with a diameter of 3 μm-6 μm and a thickness of 100 nm-300 nm.

[0076] In this embodiment, the nitrogen-doped carbon quantum dots are spherical materials with a diameter of 2 nm to 10 nm.

[0077] The preparation method of the bismuth oxybrom...

Embodiment 2

[0119] Application of a nitrogen-doped carbon quantum dot modified bismuth oxybromide composite photocatalyst with oxygen vacancies in the production of hydrogen peroxide, comprising the following steps:

[0120] Weigh respectively BiOBr (comparative example 1), NB-6 (comparative example 2), OV-BiOBr (comparative example 3), NOB-6 (embodiment 1) of 0.05g, and add them to 100mL, volume concentration respectively In a 10% aqueous solution of isopropanol, stir magnetically for one hour in a dark place (that is, under dark conditions), turn on the light source after reaching adsorption equilibrium, and carry out a photocatalytic reaction under visible light (λ≥420nm) for 60 minutes to complete the production of hydrogen peroxide .

[0121] In this embodiment, 100 mL of isopropanol solution with a volume concentration of 10% without adding any material is used as a blank for comparison.

[0122] Determination of hydrogen peroxide production: absorb the photocatalytic reaction solu...

Embodiment 3

[0130] To investigate the reusability of nitrogen-doped carbon quantum dots modified bismuth oxybromide composite photocatalyst with oxygen vacancies in the process of photocatalytic production of hydrogen peroxide, including the following steps:

[0131] (1) Weigh 0.05g of the bismuth oxybromide composite photocatalyst (NOB-6) with oxygen vacancies modified by nitrogen-doped carbon quantum dots prepared in Example 1, add to 100mL, volume concentration of 10% isopropanol In aqueous solution, the reaction system was obtained.

[0132] (2) Place the reaction system (isopropanol solution with NOB-6 added) obtained in step (1) on a magnetic stirrer, and stir for 1 h in the dark to achieve adsorption equilibrium, and take 3 mL of the solution to represent the The initial solution, that is, the solution when the reaction time is 0min, after filtration and color development, measure its concentration with a UV-visible spectrophotometer and convert it into output.

[0133] (3) The re...

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Abstract

The invention discloses a composite photocatalyst for producing hydrogen peroxide as well as a preparation method and application of the composite photocatalyst, and belongs to the technical field ofphotocatalysis. The composite photocatalyst is a bismuth oxybromide composite photocatalyst which is modified by nitrogen-doped carbon quantum dots and has oxygen vacancies. The composite photocatalyst has the advantages of being environmentally friendly, high in photo-induced electron-hole separation efficiency, wide in light absorption range, good in photocatalytic performance stability, good inreusability and the like, and the preparation method of the composite photocatalyst has the advantages that the preparation process is simple, operation conditions are easy to control, raw materialsare simple and easy to obtain, and the preparation cost is low. The composite photocatalyst disclosed by the invention can be used for producing hydrogen peroxide, has the advantages of simple application method, high yield and good reusability, and has a very good practical application prospect.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and relates to a composite photocatalyst for producing hydrogen peroxide, a preparation method and application thereof. Background technique [0002] With the development of modern industry, the problems of energy crisis and environmental pollution are becoming more and more serious. Among them, energy shortage and environmental degradation are major problems that human beings face and need to be solved urgently in the 21st century. Therefore, new energy utilization and environmental pollution control are of great significance to the national sustainable development strategy. Due to its low cost, no pollution and high efficiency, photocatalytic technology has broad application prospects in energy storage, conversion and environmental protection. [0003] Bismuth oxybromide (BiOBr) is a photocatalytic material with visible light response, which has been widely used in photocatalysis due to...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/02C01B15/026
CPCB01J27/24C01B15/026B01J35/40B01J35/39
Inventor 袁兴中于瀚博蒋龙波张进熊婷陈浩云
Owner HUNAN UNIV
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