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Self-assembled tetrakis(4-carboxyphenyl)porphyrin/oxygen-doped carbon nitride nanosheet heterojunction photocatalyst and its preparation method and application

A technology of carboxyphenyl and photocatalyst, which is applied in the field of photocatalytic materials, can solve the problems that affect the application prospect of photocatalysis, high probability of recombination of photogenerated electron-hole pairs, weak photoreduction ability, etc., and achieve excellent degradation of pollutants and Oxygen production performance, improved migration ability, and the effect of expanding the spectral absorption range

Active Publication Date: 2021-12-21
JIANGNAN UNIV
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  • Summary
  • 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 tetrakis(4-carboxyphenyl)porphyrin/oxygen-doped carbon nitride nanosheet heterojunction photocatalyst and its preparation method and application
  • Self-assembled tetrakis(4-carboxyphenyl)porphyrin/oxygen-doped carbon nitride nanosheet heterojunction photocatalyst and its preparation method and application
  • Self-assembled tetrakis(4-carboxyphenyl)porphyrin/oxygen-doped carbon nitride nanosheet heterojunction photocatalyst and its preparation method and application

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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 tetrakis(4-carboxyphenyl)porphyrin / oxygen-doped carbon nitride nanosheet heterojunction photocatalyst and its preparation method and application. The photocatalyst is composed of self-assembled tetrakis(4-carboxyphenyl) Base) porphyrin (SA‑TCPP) and oxygen-doped carbon nitride nanosheets (O‑CN) are composited by electrostatic interaction and π‑π interaction, where the mass ratio of O‑CN to SA‑TCPP ranges from 1 : 0.001~0.8; The SA-TCPP is modified on the O-CN by the in-situ method. Compared with the prior art, the present invention has the following advantages: (1) the photocatalyst of the present invention has more excellent photocatalytic degradation of pollutants and photolysis compared to O-CN and SA-TCPP of the prior art (2) The method of the invention is green, safe, simple in process, low in cost, suitable for industrial mass production, and has 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 Patents(China)
IPC IPC(8): B01J31/02B01J27/24B01J37/10B01J37/08C01B13/02
CPCB01J31/0244B01J31/0254B01J27/24B01J35/023B01J35/004B01J37/10B01J37/08C01B13/0207
Inventor 徐婧王周平高遒竹
Owner JIANGNAN UNIV
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