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Porphyrin sensitization carbon nitride photocatalyst for producing hydrogen peroxide and preparation method of photocatalyst

A technology for porphyrin sensitization of carbon nitride and hydrogen peroxide, applied to organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, peroxides/peroxyhydrates/peroxyacids/super Oxides/ozonides and other directions can solve the problems of high photogenerated electron-hole pair recombination rate, low hydrogen peroxide production efficiency, and low quantum efficiency, and achieve low raw material cost, excellent visible light effect, and the effect of inhibiting recombination

Inactive Publication Date: 2019-08-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, carbon nitride still has the defects of high recombination rate of photogenerated electron-hole pairs and low quantum efficiency, so its efficiency of producing hydrogen peroxide is not high.

Method used

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  • Porphyrin sensitization carbon nitride photocatalyst for producing hydrogen peroxide and preparation method of photocatalyst
  • Porphyrin sensitization carbon nitride photocatalyst for producing hydrogen peroxide and preparation method of photocatalyst
  • Porphyrin sensitization carbon nitride photocatalyst for producing hydrogen peroxide and preparation method of photocatalyst

Examples

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Effect test

Embodiment 1

[0035] A method for preparing a porphyrin-sensitized carbon nitride composite photocatalyst for producing hydrogen peroxide, comprising the steps of:

[0036] (1) Take 5 g of melamine and place it in a muffle furnace, heat it up to 550 °C for 4 hours at a heating rate of 1 °C / min and calcinate it for 4 hours, grind the resulting solid into a fine powder with a particle size of 50 μm, and then heat it at a heating rate of 5 °C / min The heating rate is raised to 500°C for 2 hours and calcined to obtain carbon nitride nanosheets;

[0037] (2) Dissolve 5.58g of p-bromobenzaldehyde and 2.1mL of pyrrole in 150mL of nitrobenzene, add 225mL of acetic acid, mix well, and react at 120°C for 1 hour. After the reaction, filter the filter residue and use methanol and deionized Washed with water, then recrystallized with methanol and chloroform to obtain the product porphyrin;

[0038] (3) Dissolving the porphyrin obtained in step (2) in tetrahydrofuran to obtain a porphyrin solution, the c...

Embodiment 2

[0046] A method for preparing a porphyrin-sensitized carbon nitride composite photocatalyst for producing hydrogen peroxide, comprising the steps of:

[0047] (1) Take 5g of melamine and place it in a muffle furnace, heat up to 500°C for 3 hours at a heating rate of 0.5°C / min and calcinate for 3 hours. The heating rate was increased to 450°C for 2.5 hours and calcined to obtain carbon nitride nanosheets;

[0048] (2) Dissolve 3g of p-bromobenzaldehyde and 1.13mL of pyrrole in 150mL of nitrobenzene, add 150mL of acetic acid, mix well, and react at 130°C for 2 hours. After the reaction, filter the filter residue and wash it with methanol and deionized water Washing, then recrystallization with methanol and chloroform to obtain the product porphyrin;

[0049] (3) dissolving the porphyrin obtained in step (2) in tetrahydrofuran to obtain a porphyrin solution, the concentration of the porphyrin solution is 0.1 mg / mL;

[0050] (4) Take 0.15g of carbon nitride nanosheets and ultras...

Embodiment 3

[0053] A method for preparing a porphyrin-sensitized carbon nitride composite photocatalyst for producing hydrogen peroxide, comprising the steps of:

[0054] (1) Take 5g of melamine and place it in a muffle furnace, heat up to 600°C for 5 hours at a heating rate of 2°C / min and calcinate for 5 hours, grind the resulting solid into a fine powder with a particle size of 100 μm, and then heat it at a heating rate of 10°C / min The heating rate is raised to 400°C for 3 hours and calcined to obtain carbon nitride nanosheets;

[0055] (2) Dissolve 9g of p-bromobenzaldehyde and 3.37mL of pyrrole in 150mL of nitrobenzene, add 300mL of acetic acid, mix well, and react at 140°C for 3 hours. After the reaction, filter the filter residue and wash it with methanol and deionized water Washing, then recrystallization with methanol and chloroform to obtain the product porphyrin;

[0056] (3) The porphyrin obtained in step (2) is dissolved in tetrahydrofuran to obtain a porphyrin solution, and ...

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Abstract

The invention discloses a porphyrin sensitization carbon nitride composite photocatalyst for producing hydrogen peroxide and a preparation method of the photocatalyst. The method comprises the steps that a carbon nitride precursor is calcined in a muffle furnace for obtaining a carbon nitride nano sheet; then, bromobenzaldehyde and pyrrole are dissolved in an organic solvent, and under the catalytic effect of acid, through a reaction, porphyrin is obtained; the carbon nitride nano sheet is dispersed in ethyl alcohol, then a porphyrin solution is added to the mixed solution, and through a reaction at the normal temperature, the porphyrin sensitization carbon nitride composite photocatalyst for producing the hydrogen peroxide is prepared. The preparation method has the advantages of being simple in step, low in cost, high in controllability and the like, and the porphyrin sensitization carbon nitride composite photocatalyst has excellent photocatalysis and hydrogen peroxide production performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional materials, and in particular relates to a porphyrin-sensitized carbon nitride photocatalyst and a preparation method thereof. Background technique [0002] As a green and efficient redox agent, hydrogen peroxide has broad application prospects in wastewater treatment, medical treatment, chemical energy and other fields. At present, the synthesis methods of hydrogen peroxide mainly include electrochemical synthesis, alcohol oxidation and anthraquinone autoxidation. However, these methods need to consume a large amount of energy and organic reactants, and the addition of organic reactants will increase the cost of later product purification. Recently, it has been found that dissolved oxygen in water can be reduced to hydrogen peroxide by photocatalysis using suitable semiconductors. Compared with traditional methods, photocatalytic production of hydrogen peroxide can directly uti...

Claims

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Application Information

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IPC IPC(8): B01J31/02C01B15/027
CPCB01J31/0244C01B15/027B01J35/19B01J35/23B01J35/39
Inventor 黄洪徐佳杰董志勇司徒粤
Owner SOUTH CHINA UNIV OF TECH
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