Polythiophene-carbon nitride composite photocatalyst as well as preparation method and application thereof

A technology of polythiophene and carbon nitride, which is applied in the field of photocatalysis, can solve the problems that cannot fully meet the application requirements, high electron-hole recombination efficiency, and poor visible light absorption ability, so as to improve photocatalytic performance, light absorption ability, low cost effect

Active Publication Date: 2022-05-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, common photocatalysts mainly include titanium dioxide, titanium carbide, bismuth oxide, bismuth tungstate, etc. These catalysts generally have problems such as poor visible light absorption ability and high electron-hole recombination efficiency, and the photocatalytic production of H2O2 is low and cannot fully meet the actual application requirements

Method used

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  • Polythiophene-carbon nitride composite photocatalyst as well as preparation method and application thereof
  • Polythiophene-carbon nitride composite photocatalyst as well as preparation method and application thereof
  • Polythiophene-carbon nitride composite photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of polythiophene-carbon nitride composite photocatalyst, its preparation method comprises the following steps:

[0044] 1) Add 10.0 g of melamine into the crucible and place it in a muffle furnace, raise the temperature to 550°C at a heating rate of 5°C / min, calcinate at a constant temperature for 4 hours, grind and pass through a 500-mesh sieve, and then obtain the calcined product (block carbon nitride) into the crucible, placed in a muffle furnace, raised to 500°C at a heating rate of 10°C / min, and calcined at a constant temperature for 2 hours to obtain carbon nitride nanosheets;

[0045] 2) Add 1mL of thiophene to 100mL of chloroform, stir evenly, then add 2.800g of ammonium persulfate and fill it with argon for protection, then put it in an oil bath, keep it warm at 60°C for 12h, then wash and centrifuge 3 times with methanol , and then vacuum-dried at 60°C for 12 hours to obtain polythiophene;

[0046] 3) Add 100 mg of polythiophene to 100 mL of tetrahydr...

Embodiment 2

[0058] A kind of polythiophene-carbon nitride composite photocatalyst, its preparation method comprises the following steps:

[0059] 1) Add 10.0 g of melamine into the crucible and place it in a muffle furnace, raise the temperature to 550 °C at a heating rate of 5 °C / min, calcinate at a constant temperature for 4 hours, grind and pass through a 500-mesh sieve, and then obtain the calcined product (block carbon nitride) into the crucible, placed in a muffle furnace, raised to 500°C at a heating rate of 10°C / min, and calcined at a constant temperature for 2 hours to obtain carbon nitride nanosheets;

[0060] 2) Add 1mL of thiophene to 100mL of chloroform, stir evenly, then add 2.800g of ammonium persulfate and fill it with argon for protection, then put it in an oil bath, keep it warm at 60°C for 12h, then wash and centrifuge 3 times with methanol , and then vacuum-dried at 60°C for 12 hours to obtain polythiophene;

[0061] 3) Add 100 mg of polythiophene to 100 mL of tetrahy...

Embodiment 3

[0065] A kind of polythiophene-carbon nitride composite photocatalyst, its preparation method comprises the following steps:

[0066] 1) Add 10.0 g of melamine into the crucible and place it in a muffle furnace, raise the temperature to 550 °C at a heating rate of 5 °C / min, calcinate at a constant temperature for 4 hours, grind and pass through a 500-mesh sieve, and then obtain the calcined product (block carbon nitride) into the crucible, placed in a muffle furnace, raised to 500°C at a heating rate of 10°C / min, and calcined at a constant temperature for 2 hours to obtain carbon nitride nanosheets;

[0067] 2) Add 1mL of thiophene to 100mL of chloroform, stir evenly, then add 2.800g of ammonium persulfate and fill it with argon for protection, then put it in an oil bath, keep it warm at 60°C for 12h, then wash and centrifuge 3 times with methanol , and then vacuum-dried at 60°C for 12 hours to obtain polythiophene;

[0068] 3) Add 100 mg of polythiophene to 100 mL of tetrahy...

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Abstract

The invention discloses a polythiophene-carbon nitride composite photocatalyst as well as a preparation method and application thereof. The polythiophene-carbon nitride composite photocatalyst comprises a carrier carbon nitride nanosheet and a loaded polythiophene nanosheet, and the preparation method of the polythiophene-carbon nitride composite photocatalyst comprises the following steps: 1) calcining melamine to prepare the carbon nitride nanosheet, and dispersing thiophene and an oxidizing agent in a solvent for polymerization reaction to prepare polythiophene; 2) dispersing polythiophene in a solvent to prepare a polythiophene dispersion liquid; and (3) dispersing the carbon nitride nanosheets in a solvent, dropwise adding the polythiophene dispersion liquid while stirring, carrying out constant-temperature reaction after the polythiophene dispersion liquid is added, separating out solids, washing and drying to obtain the polythiophene-carbon nitride composite photocatalyst. The polythiophene-carbon nitride composite photocatalyst has excellent photocatalytic performance, can be used as a catalyst for hydrogen peroxide production reaction, and is simple in preparation process, low in cost, high in controllability and suitable for large-scale production and application.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a polythiophene-carbon nitride composite photocatalyst and its preparation method and application. Background technique [0002] Hydrogen peroxide (H 2 o 2 ) is a clean oxidizing agent with strong oxidizing properties and is recognized as a low-toxic substance. It is widely used in industrial wastewater treatment (degradation of organic matter), medical sterilization, chemical energy and other fields. At present, the industrial production methods of hydrogen peroxide mainly include anthraquinone method, electrochemical synthesis method and alcohol oxidation method, etc. These methods generally have problems such as high energy consumption, complicated preparation process, and low atom utilization rate. [0003] In recent years, researchers have found that photocatalysts with suitable energy band structures can catalyze the reaction of oxygen and water to obtain H 2 o 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06C01B15/027
CPCB01J31/069B01J35/004C01B15/027Y02W10/37
Inventor 黄洪侯金醒司徒粤王久武
Owner SOUTH CHINA UNIV OF TECH
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