a g-c 3 no 4 -tio 2 Heterojunction photocatalyst and preparation method thereof

A photocatalyst, g-c3n4 technology, applied in the field of photocatalytic materials, can solve the problems of harsh conditions, low catalytic efficiency and photocatalytic activity, complex preparation process, etc., and achieve mild reaction conditions, good photocurrent response performance, and simple preparation method. Effect

Active Publication Date: 2020-07-28
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 the problem of TiO in the prior art 2 The photocatalyst has low catalytic efficiency and photocatalytic activity, complex preparation process, harsh conditions and other problems. The present invention provides a g-C with tight heterogeneous Ti-N chemical bonding 3 N 4 –TiO 2 Composite photocatalyst and preparation method thereof, the present invention constructs TiO 2 with g-C 3 N 4 The chemical bonding between them forms a tight heterostructure, which is of great significance for the improvement of the photocatalytic activity of the coupling system and the application of improving the environment.

Method used

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  • a g-c <sub>3</sub> no <sub>4</sub> -tio <sub>2</sub> Heterojunction photocatalyst and preparation method thereof
  • a g-c <sub>3</sub> no <sub>4</sub> -tio <sub>2</sub> Heterojunction photocatalyst and preparation method thereof
  • a g-c <sub>3</sub> no <sub>4</sub> -tio <sub>2</sub> Heterojunction photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put 20g of melamine in a tube furnace and calcinate at 500°C for 4h in the air atmosphere to obtain g-C 3 N 4.

[0026] Mix 12 mL of n-butyl titanate and 24 mL of absolute ethanol, and add 2 g of g-C prepared in the above step 3 N 4 , configured as A mixed solution; 10mL of HNO with a concentration of 1mol / L 3 Mix it with 12mL of absolute ethanol to form a mixed solution of B; add the mixed solution of B to the mixed solution of A dropwise while stirring to form a sol; transfer the sol into the reaction kettle, and carry out hydrothermal synthesis at 90°C. After 24 hours, the cooled product was filtered and separated, and the separated solid matter was washed and dried to obtain g-C 3 N 4 / TiO 2 catalyst of light.

[0027] 4g of g-C prepared in the above steps 3 N 4 / TiO 2 Add it to 150mL tetrahydrofuran, then add 1.5g dicyclohexylcarbodiimide, heat and reflux at 50°C for 5h, wash and dry the reacted product to obtain g-C 3 N 4 –TiO 2 heterojunction photoca...

Embodiment 2

[0029] Put 20g of melamine in a tube furnace and calcinate at 520°C for 4h under air atmosphere to obtain g-C 3 N 4 .

[0030] Mix 12 mL of n-butyl titanate and 24 mL of absolute ethanol, and add 3 g of g-C prepared in the above step 3 N 4 , configured as A mixed solution; 10mL of HNO with a concentration of 1mol / L 3 Mix it with 12mL of absolute ethanol to prepare B mixture; add B mixture dropwise to A mixture while stirring to form a sol; After 24 hours, the cooled product was filtered and separated, and the separated solid matter was washed and dried to obtain g-C 3 N 4 / TiO 2 catalyst of light.

[0031] 4g of g-C prepared in the above steps 3 N 4 / TiO 2 Add to 150mL tetrahydrofuran, then add 2g dicyclohexylcarbodiimide, heat and reflux at 55°C for 8 hours, wash and dry the reacted product to obtain g-C 3 N 4 –TiO 2 heterojunction photocatalysts.

Embodiment 3

[0033] Put 20g of melamine in a tube furnace and calcinate at 540°C for 4h in the air atmosphere to obtain g-C 3 N 4 .

[0034] Mix 12 mL of n-butyl titanate and 24 mL of absolute ethanol, and add 4 g of g-C prepared in the above step 3 N 4 , configured as A mixed solution; 10mL of HNO with a concentration of 1mol / L 3 Mix it with 12mL of absolute ethanol to form a mixed solution of B; add the mixed solution of B to the mixed solution of A dropwise while stirring to form a sol; transfer the sol into the reaction kettle, and carry out hydrothermal synthesis at 120°C. After 24 hours, the cooled product was filtered and separated, and the separated solid matter was washed and dried to obtain g-C 3 N 4 / TiO 2 catalyst of light.

[0035] 4g of g-C prepared in the above steps 3 N 4 / TiO 2 Add to 150mL tetrahydrofuran, then add 2.5g dicyclohexylcarbodiimide, heat and reflux at 60°C for 10h, wash and dry the reacted product to obtain g-C 3 N 4 –TiO 2 heterojunction photoca...

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Abstract

The invention discloses a g-C 3 N 4 –TiO 2 Heterojunction photocatalyst and preparation method thereof. The method comprises the steps of: calcining melamine at a high temperature to obtain g-C 3 N 4 ; the resulting g‑C 3 N 4 with TiO 2 Precursors mixed to obtain g-C by sol-hydrothermal method 3 N 4 / TiO 2 Photocatalyst; The resulting g-C 3 N 4 / TiO 2 React under the action of shrinkage agent to get g‑C 3 N 4 –TiO 2 heterojunction photocatalysts. g-C of the present invention 3 N 4 –TiO 2 The composite catalyst has a compact heterojunction structure, which has a high photocurrent response capability under light conditions, and the heterojunction structure can effectively inhibit the recombination of photogenerated electron-holes. At the same time, the preparation method of the invention has easy-to-obtain raw materials, low cost, mild reaction conditions and no pollution to the environment, and has good application prospects.

Description

technical field [0001] The invention relates to the field of photocatalytic materials, in particular to a g-C 3 N 4 –TiO 2 Heterojunction photocatalyst and preparation method thereof. Background technique [0002] With the rapid increase of the world's population and the rapid development of modern industry, energy shortage and environmental pollution have become two major problems faced by today's society. As an emerging and green technology, photocatalysis based on semiconductor materials has great potential in solving energy and environmental problems. In recent decades, among many semiconductors, TiO 2 Because of its stable chemical properties, mild reaction conditions, strong oxidation-reduction properties, and low secondary pollution, it has always been a hot research area for researchers. However, pure TiO 2 Photogenerated electrons and holes are easily recombined in the photocatalytic reaction, resulting in low photon quantum efficiency and inhibited photocatal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C02F1/30
CPCB01J27/24B01J35/004C02F1/30C02F2305/10
Inventor 傅小飞高永蒋莉张曼莹孔峰马帅帅蒋敏
Owner JIANGSU UNIV OF TECH
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