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Self-assembled tetra (4-carboxyphenyl) porphyrin/oxygen-doped carbon nitride nanosheet heterojunction photocatalyst as well as preparation method and application thereof

A carboxyphenyl, photocatalyst technology, applied in the field of photocatalytic materials, can solve the problems of high photo-generated electron-hole pair recombination probability, affecting the application prospect in the field of photocatalysis, weak photoreduction ability, etc. gap, enhance the effect of light absorption

Active Publication Date: 2020-12-25
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the recombination probability of photogenerated electron-hole pairs of SA-TCPP is high and the photoreduction ability is weak, which affects its application prospect in the field of photocatalysis.

Method used

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  • Self-assembled tetra (4-carboxyphenyl) porphyrin/oxygen-doped carbon nitride nanosheet heterojunction photocatalyst as well as preparation method and application thereof
  • Self-assembled tetra (4-carboxyphenyl) porphyrin/oxygen-doped carbon nitride nanosheet heterojunction photocatalyst as well as preparation method and application thereof
  • Self-assembled tetra (4-carboxyphenyl) porphyrin/oxygen-doped carbon nitride nanosheet heterojunction photocatalyst as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0037] A self-assembled four (4-carboxyphenyl) porphyrin / oxygen-doped carbon nitride nanosheet heterojunction photocatalyst, the preparation method of the photocatalyst comprises the following steps:

[0038] First, put 3-amino-1,2,4-triazole in a crucible, put it into a muffle furnace, heat up to 550°C at a rate of 2°C / min and calcinate for 4 hours, and grind the product to obtain block nitride Carbon: Grind blocky carbon nitride, place it in a crucible, put it into a muffle furnace, heat up to 500°C at a rate of 5°C / min for secondary calcination for 2h, and grind the product to obtain carbon nitride nanosheets; 0.9g carbon nitride nanosheets dispersed in 100mL 30vol%H 2 o 2 Ultrasonic (560W, 40kHz) in aqueous solution for 30min, then transfer the dispersion to a hydrothermal kettle, heat at 120°C for 6h, centrifuge to collect the precipitate, wash the precipitate with water several times, dry and grind into powder, the obtained powder product is Oxygen-doped carbon nitride...

Embodiment 2

[0040] A self-assembled four (4-carboxyphenyl) porphyrin / oxygen-doped carbon nitride nanosheet heterojunction photocatalyst, the preparation method of the photocatalyst comprises the following steps:

[0041] First, put 3-amino-1,2,4-triazole in a crucible, put it into a muffle furnace, heat up to 450°C at a rate of 1°C / min and calcinate for 1 hour, and grind the product to obtain block nitride carbon: Grind blocky carbon nitride, place it in a crucible, put it into a muffle furnace, heat up to 450°C at a rate of 1°C / min for secondary calcination for 1h, and grind the product to obtain carbon nitride nanosheets; 1 g of carbon nitride nanosheets dispersed in 30 mL of 0.1 vol% H 2 o 2 Ultrasonic (200W, 10kHz) in the aqueous solution for 5min, then transfer the dispersion to a hydrothermal kettle, heat at 80°C for 2h, collect the precipitate by centrifugation, wash the precipitate with water several times, dry it and grind it into powder, the obtained powder product is Oxygen-d...

Embodiment 3

[0043] A self-assembled four (4-carboxyphenyl) porphyrin / oxygen-doped carbon nitride nanosheet heterojunction photocatalyst, the preparation method of the photocatalyst comprises the following steps:

[0044] First, put 3-amino-1,2,4-triazole in a crucible, put it into a muffle furnace, heat up to 600°C at a rate of 12°C / min and calcinate for 8 hours, and grind the product to obtain block nitride Carbon: Grind blocky carbon nitride, place it in a crucible, put it into a muffle furnace, heat up to 600°C at a rate of 12°C / min for secondary calcination for 8h, and grind the product to obtain carbon nitride nanosheets; 1g carbon nitride nanosheets dispersed in 150mL 40vol% H 2 o 2 Ultrasonic (800W, 50kHz) in aqueous solution for 60min, then transfer the dispersion to a hydrothermal kettle, heat at 150°C for 10h, collect the precipitate by centrifugation, wash the precipitate with water several times, dry it and grind it into powder, the obtained powder product is Oxygen-doped ca...

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Abstract

The invention discloses a self-assembled tetra (4-carboxyl phenyl) porphyrin / oxygen-doped carbon nitride nanosheet heterojunction photocatalyst as well as a preparation method and application thereof.The photocatalyst is formed by compounding self-assembled tetra (4-carboxyl phenyl) porphyrin (SA-TCPP) and an oxygen-doped carbon nitride nanosheet (O-CN) through electrostatic interaction and pi-piinteraction, the mass ratio of the O-CN to the SA-TCPP ranges from 1: 0.001 to 0.8; the SA-TCPP is modified on the O-CN through an in-situ method. Compared with the prior art, the photocatalyst disclosed by the invention has the following advantages that (1) compared with O-CN and SA-TCPP in the prior art, the photocatalyst disclosed by the invention has more excellent performances of photocatalytically degrading pollutants and photolyzing water to produce oxygen; and (2) the method disclosed by the invention is green, safe, simple in process, low in cost and suitable for industrial mass production, and has relatively high application prospect and practical value.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and relates to a heterojunction photocatalyst, specifically a self-assembled tetrakis(4-carboxyphenyl)porphyrin / oxygen-doped carbon nitride nanosheet heterojunction photocatalyst and a preparation method thereof and apply. Background technique [0002] Carbon nitride is a non-metallic n-type organic semiconductor visible light photocatalyst. It has the advantages of convenient synthesis, low cost, good stability, no biological toxicity, and easy structure regulation. Therefore, it is widely used in the degradation of pollutants and photolysis of water. However, the carbon nitride prepared by the traditional polycondensation method has large particle size, low specific surface area, low utilization rate of visible light, and high recombination probability of photogenerated electron-hole pairs, resulting in unsatisfactory photocatalytic activity. Therefore, it is of great signific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02B01J27/24B01J37/10B01J37/08C01B13/02
CPCB01J31/0244B01J31/0254B01J27/24B01J37/10B01J37/08C01B13/0207B01J35/39B01J35/40
Inventor 徐婧王周平高遒竹
Owner JIANGNAN UNIV
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