a g-c 3 n 4 --cnts heterojunction photocatalyst and preparation method thereof

A photocatalyst, g-c3n4 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 capacity and environmental pollution-free

Active Publication Date: 2020-02-14
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • a g-c <sub>3</sub> n <sub>4</sub> --cnts heterojunction photocatalyst and preparation method thereof
  • a g-c <sub>3</sub> n <sub>4</sub> --cnts heterojunction photocatalyst and preparation method thereof
  • a g-c <sub>3</sub> n <sub>4</sub> --cnts heterojunction photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1g-C 3 N 4 -CNTs heterojunction photocatalyst preparation:

[0028] (1) After uniformly mixing 30g of melamine and 1g of CNTs, place it in a tube furnace and calcinate at 450°C for 4h in an air atmosphere to obtain g-C 3 N 4 / CNTs.

[0029] (2) The g-C obtained in step (1) 3 N 4 / CNTs weighed 2.0g and added to 40mL sulfuric acid / nitric acid (volume ratio 1:2) mixed acid solution, refluxed for 12h at 40℃, 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 / CNTs-COOH Weigh 1.5g into 150mL tetrahydrofuran solution, and add 1g dicyclohexylcarbodiimide at the same time, heat and reflux for 8h at 50℃, wash and dry the reaction product to obtain g-C 3 N 4 -CNTs heterojunction photocatalyst.

Embodiment 2

[0031] Example 2g-C 3 N 4 -CNTs heterojunction photocatalyst preparation:

[0032] (1) After uniformly mixing 30g of melamine and 1.5g of CNTs, place it in a tube furnace and calcinate at 500°C for 4h 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 to 40mL sulfuric acid / nitric acid (volume ratio 1:2) mixed acid solution, refluxed at 45℃ for 16h, the product after the reaction was washed 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 / CNTs-COOH Weigh 1.5g into 150mL tetrahydrofuran solution, and at the same time add 1.5g dicyclohexylcarbodiimide, heat and reflux at 55℃ for 12h, wash and dry the reaction product to obtain g-C 3 N 4 -CNTs heterojunction photocatalyst.

Embodiment 3

[0035] Example 3g-C 3 N 4 -CNTs heterojunction photocatalyst preparation:

[0036] (1) After mixing 30g of melamine and 2g of CNTs uniformly, place it in a tube furnace and calcinate at 520℃ for 4h under 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 to 40mL sulfuric acid / nitric acid (volume ratio 1:3) mixed acid solution, refluxed for 24h at 45℃, washed the reacted product with distilled water and dried to prepare g-C 3 N 4 / CNTs-COOH.

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

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Abstract

The invention discloses a g-C 3 N 4 - Preparation method of CNTs heterojunction photocatalyst. The method comprises the steps of: uniformly mixing melamine and carbon nanotubes and calcining at high temperature to obtain g-C 3 N 4 / CNTs; the resulting g‑C 3 N 4 / CNTs are placed in a mixture of sulfuric acid / nitric acid for acidification and oxidation treatment to obtain surface carboxylated g‑C 3 N 4 / CNTs‑COOH; convert the resulting g‑C 3 N 4 / CNTs‑COOH reacts under the action of dehydrating agent to obtain g‑C 3 N 4 – CNTs heterojunction photocatalyst.

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 shortages and environmental problems. Graphite phase carbon nitride (g-C 3 N 4 ) As a completely non-metal semiconductor, it has the advantages of stable chemical properties, narrow band gap, and strong compatibility. 2 After that, another star material in the field of photocatalysis. However, studies have found that in the photocatalytic reaction, g-C 3 N 4 Surface photogenerated electrons and holes are very easy to recombine, resulting in low light quantum efficiency and inhibited photocatalytic activity. Therefore, in the g-C 3 N 4 In the research and development, how to promote the separation of photogenerated electrons and holes on its surface has ...

Claims

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Application Information

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Patent Type & Authority Patents(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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