Photocatalyst and preparation method thereof

A photocatalyst and composite material technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., can solve the problem of high cost, small specific surface area and no reactive active sites. and other problems, to achieve the effects of mild reaction conditions, cheap and easy-to-obtain raw materials, and broad application prospects.

Inactive Publication Date: 2020-12-25
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small specific surface area of ​​a single bismuth-based photocatalyst, there are not enough reactive sites, and its own structure is not conducive to the transfer and storage of electrons, and cannot effectively transfer photogenerated carriers, resulting in the easy recombination of photogenerated electrons and holes. thereby reducing the photocatalytic activity of the catalyst
Patent CN108017086A discloses a preparation method of bismuth oxycarbonate-graphene oxide nanocomposite, which is to mix solid-phase raw materials sodium bismuthate dihydrate, oxalic acid dihydrate and graphene oxide nanosheets, and then carry out ball milling solid-phase reaction,

Method used

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Examples

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Example Embodiment

[0034]Example 1

[0035]An embodiment of the photocatalyst preparation method of the present invention. The preparation method of the photocatalyst in this embodiment includes the following steps:

[0036]1. Preparation of Graphene Oxide:

[0037](1) Put 20mL H2SO4(Mass concentration 98%), 3 grams K2S2O8, 3g P2O5Mix 3 grams of graphite in a flask, mix well with a magnetic stirrer, and keep the reaction system at 80°C for 6 hours in a water bath;

[0038](2) After the reaction, add 500mL deionized water for dilution, and then statically age for 12h at room temperature;

[0039](3) After aging, vacuum filter with glass fiber filter paper, collect the black precipitate, and dry it in an oven at 105°C for 24 hours to obtain a pre-oxidized sample;

[0040](4) Put 3.6 grams of pre-oxidized sample, 120 milliliters of H2SO4(Mass concentration 98%) and 15 grams of KMnO4Slowly add it to the flask, stir magnetically to 10°C in an ice bath to obtain a reaction mixture;

[0041](5) After the reaction mixture obtaine...

Example Embodiment

[0055]Example 2

[0056]An embodiment of the preparation method of the photocatalyst of the present invention, the preparation method of the photocatalyst in this embodiment includes the following steps:

[0057]1. The preparation method of graphene oxide is the same as in Example 1;

[0058]2.Bi2O2CO3-Synthesis of GO composite materials:

[0059](1) Put 5.09g Bi(NO3)3·5H2O is fully dissolved in 10mL dilute HNO with a mass concentration of 10%3In solution, get solution;

[0060](2) Add 1.47g of citric acid to the above solution, and stir the solution until a transparent solution is formed;

[0061](3) Add 1.36 mL of the prepared GO solution to the above transparent solution and ultrasonically treat it for 55 minutes, and further magnetically stir the solution for 60 minutes to obtain a uniform suspension;

[0062](4) Use NaOH solution to adjust the pH of the above suspension to 7.5;

[0063](5) After adjusting the pH value of the suspension, it is transferred to an autoclave and reacted at 190°C for 11 hou...

Example Embodiment

[0070]Example 3

[0071]An embodiment of the preparation method of the photocatalyst of the present invention, the preparation method of the photocatalyst in this embodiment includes the following steps:

[0072]1. The preparation method of graphene oxide is the same as in Example 1;

[0073]2.Bi2O2CO3-Synthesis of GO composite materials:

[0074](1) Put 15gBi(NO3)3·5H2O is fully dissolved in 10mL dilute HNO with a mass concentration of 10%3In solution, get solution;

[0075](2) Add 2g of citric acid to the above solution, and stir the solution until a transparent solution is formed;

[0076](3) Add 2 mL of the prepared GO solution to the above-mentioned transparent solution for ultrasonic treatment for 60 minutes, and further magnetically stir the solution for 80 minutes to obtain a uniform suspension;

[0077](4) Use NaOH solution to adjust the pH value of the above suspension to 8.0;

[0078](5) After adjusting the pH value of the suspension, it is transferred to an autoclave and reacted at 200°C for 10...

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Abstract

The invention relates to a photocatalyst and a preparation method thereof, and belongs to the technical field of nano composite material photocatalysis. Bi2O2CO3 is used as a catalyst substrate, GO and PDA are doped onto Bi2O2CO3, and the GO is doped onto Bi2O2CO3, so that the electron capture capacity can be improved, an active center can be provided, and the photocatalytic performance can be improved; meanwhile, the PDA encapsulates and reduces the GO, so that the binding force of Bi2O2CO3 and rGO (redox graphene oxide) is increased, the charge transfer capability is improved, and the catalytic activity is improved. The preparation process of the photocatalyst is green and environment-friendly, the reaction conditions are mild, the used raw materials are cheap and easy to obtain, and thephotocatalyst has a wide application prospect in organic degradation.

Description

technical field [0001] The invention relates to a photocatalyst and a preparation method thereof, and belongs to the technical field of nanocomposite photocatalysis. Background technique [0002] With the rapid development of industry, energy shortage and environmental pollution are two important global problems today. Among them, dyes are representative organic pollutants widely used in industry. These pollutants cannot be effectively degraded when conventional degradation techniques are used, thus causing significant environmental risks. As an important renewable energy on the earth, light energy has played an important role in replacing non-renewable energy. Photocatalysts can produce strong oxidizing substances (such as hydroxyl radicals, oxygen, etc.) under light irradiation, and can be used to decompose organic compounds, some inorganic compounds, bacteria and viruses, etc., so as to achieve the purpose of purifying pollutants. One of the important applications of p...

Claims

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Application Information

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IPC IPC(8): B01J31/26B01J31/06C02F1/30C02F101/38
CPCB01J31/06B01J31/26B01J35/0033B01J35/004C02F1/30C02F2101/38C02F2305/10
Inventor 苏敏华欧涛徐锐冰陈迪云
Owner GUANGZHOU UNIVERSITY
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