g-C3N4-CNTs heterojunction photo catalyst and preparation method thereof

A photocatalyst and heterojunction technology, applied in the field of photocatalytic materials, can solve the problems of easy recombination of photogenerated electrons and holes, low photocatalytic efficiency and photocatalytic activity, and achieve high practical value and application prospects, rich in strong pollutants. The effect of gathering ability and easy availability of raw materials

Active Publication Date: 2018-01-05
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to solve g-C in the prior art 3 N 4 The photocatalytic efficiency and photocatalytic activity of the photocatalyst are low, and the photogenerated electrons and holes are easy to recombine. The present invention provides a g-C with tight heterogeneous amide bond chemical bonding 3 N 4 -CNTs composite photocatalyst and its preparation method

Method used

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  • g-C3N4-CNTs heterojunction photo catalyst and preparation method thereof
  • g-C3N4-CNTs heterojunction photo catalyst and preparation method thereof
  • g-C3N4-CNTs heterojunction photo catalyst and preparation method thereof

Examples

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Effect test

Embodiment 1

[0027] Example 1g-C 3 N 4 – Preparation of CNTs heterojunction photocatalyst:

[0028] (1) After uniformly mixing 30 g of melamine and 1 g of CNTs, they were placed in a tube furnace and calcined at 450 °C for 4 h in an air atmosphere to obtain g-C3 N 4 / CNTs.

[0029] (2) the g-C obtained in step (1) 3 N 4 / CNTs weighed 2.0g and added it to 40mL sulfuric acid / nitric acid (volume ratio: 1:2) mixed acid solution, reflux reaction at 40°C for 12h, washed the reacted product with distilled water and dried to obtain g-C 3 N 4 / CNTs-COOH.

[0030] (3) the g-C obtained in step (2) 3 N 4 Weigh 1.5g of / CNTs-COOH and add it to 150mL tetrahydrofuran solution, add 1g dicyclohexylcarbodiimide at the same time, heat and reflux at 50°C for 8 hours, wash and dry the reacted product to obtain g-C 3 N 4 – CNTs heterojunction photocatalyst.

Embodiment 2

[0031] Example 2g-C 3 N 4 – Preparation of CNTs heterojunction photocatalyst:

[0032] (1) After uniformly mixing 30 g of melamine and 1.5 g of CNTs, they were placed in a tube furnace and calcined at 500 °C for 4 h in an air atmosphere to obtain g-C 3 N 4 / CNTs.

[0033] (2) the g-C obtained in step (1) 3 N 4 / CNTs weighed 2.0g and added it to 40mL sulfuric acid / nitric acid (volume ratio: 1:2) mixed acid solution, reflux reaction at 45°C for 16h, washed the reacted product with distilled water and dried to obtain g-C 3 N 4 / CNTs-COOH.

[0034] (3) the g-C obtained in step (2) 3 N 4 Weigh 1.5g of / CNTs-COOH and add it to 150mL tetrahydrofuran solution, add 1.5g dicyclohexylcarbodiimide at the same time, heat and reflux at 55°C for 12h, wash and dry the reacted product to obtain g-C 3 N 4 – CNTs heterojunction photocatalyst.

Embodiment 3

[0035] Example 3g-C 3 N 4 – Preparation of CNTs heterojunction photocatalyst:

[0036] (1) After uniformly mixing 30 g of melamine and 2 g of CNTs, they were placed in a tube furnace and calcined at 520 ° C for 4 h in an air atmosphere to obtain g-C 3 N 4 / CNTs.

[0037] (2) the g-C obtained in step (1) 3 N 4 / CNTs weighed 2.0g and added it to 40mL sulfuric acid / nitric acid (volume ratio: 1:3) mixed acid solution, reflux reaction at 45°C for 24h, washed the reacted product with distilled water and dried to obtain g-C 3 N 4 / CNTs-COOH.

[0038] (3) the g-C obtained in step (2) 3 N 4 Weigh 1.5g of / CNTs-COOH and add it to 150mL tetrahydrofuran solution, add 2g dicyclohexylcarbodiimide at the same time, heat and reflux at 60°C for 12h, wash and dry the reacted product to obtain g-C 3 N 4 – CNTs heterojunction photocatalyst.

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Abstract

The invention discloses a preparation method of a g-C3N4-CNTs heterojunction photo catalyst. The method comprises the following steps: uniformly mixing melamine and carbon nanotube; then roasting at high temperature to obtain g-C3N4 / CNTs; treating g-C3N4 / CNTs through a mixed solution of sulfuric acid / nitric acid by acidizing and oxidizing to obtain surface-carboxylated g-C3N4 / CNTs-COOH; and thenreacting the obtained g-C3N4 / CNTs-COOH through a dehydrating agent to obtain the g-C3N4-CNTs heterojunction photo catalyst.

Description

technical field [0001] The invention relates to the field of photocatalytic materials, in particular to a g-C 3 N 4 -CNTs heterojunction photocatalyst and its preparation method. Background technique [0002] As an emerging and green technology, photocatalysis based on semiconductor materials has great potential in solving energy shortage and environmental problems. Graphite carbon nitride (g-C 3 N 4 ), as a completely non-metallic semiconductor, has the advantages of stable chemical properties, narrow bandgap, and strong compatibility, and has become the next nano-TiO 2 Then another star material in the field of photocatalysis. However, the study found that in the photocatalytic reaction, g-C 3 N 4 Surface photogenerated electrons and holes are easily recombined, resulting in low photon efficiency and inhibited photocatalytic activity. Therefore, on g-C 3 N 4 How to promote the separation of photogenerated electrons and holes on its surface has always been a hot r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30
Inventor 傅小飞高永马帅帅蒋莉张曼莹孔峰熊玉婷
Owner JIANGSU UNIV OF TECH
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