Nitrogen-doped graphene quantum dot and graphite-phase carbon nitride composite photocatalyst and preparation method thereof

A technology of graphene quantum dots and graphitic carbon nitride is applied in the field of photocatalysis to achieve the effects of high catalytic activity, good stability, and improved activity and stability

Active Publication Date: 2016-09-28
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the combined application of N-GQDs and semiconductors in photocatalytic water splitting for hydrogen production is still rare.

Method used

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  • Nitrogen-doped graphene quantum dot and graphite-phase carbon nitride composite photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 0.21g (1mmol) of citric acid and 0.18g (3mmol) of urea and dissolve them in 30mL of distilled water, stir until a clear solution is formed, then transfer the solution to a 50mL polytetrafluoroethylene-lined stainless steel autoclave. Heating at 160°C for 4 hours at a constant temperature. Ethanol was added to the obtained product and centrifuged at 8000rpm for 10 minutes to obtain a solid, which was washed several times with ethanol and then dried at 60°C to obtain the final product N-GQDs. Disperse N-GQDs in water again, and its morphology is as figure 1 as shown in (a);

[0030] Dissolve 10 g of urea in a solution containing 17 mL of N-GQDs (0.2 mg / mL). After the sample is evaporated to dryness, it is calcined in a covered alumina crucible at 20 °C / min to 550 °C for 3 h, and then cooled to room temperature to obtain N-GQDs / g-C 3 N 4 complex, whose form is as figure 1 as shown in (b);

[0031] 1.32mL of H 2 PtCl 6Aqueous solution (7.723mmol / L) and 100mg o...

Embodiment 2

[0034] Weigh 0.63g (3mmol) of citric acid and 0.18g (3mmol) of urea and dissolve them in 30mL of distilled water, stir until a clear solution is formed, and then transfer the solution to a 50mL polytetrafluoroethylene-lined stainless steel autoclave. Heating at 160°C for 4 hours at a constant temperature. Ethanol was added to the obtained product and centrifuged at 8000rpm for 10 minutes to obtain a solid, which was washed several times with ethanol and then dried at 60°C to obtain the final product N-GQDs. The N-GQDs were dispersed into water again.

[0035] Put 10 g of urea into a covered alumina crucible and calcinate at 20 °C / min to 550 °C and maintain for 3 h. After cooling to room temperature, the solid product obtained can be ground to obtain pure g-C 3 N 4 sample.

[0036] Preparation of composite N-GQDs / g-C by traditional impregnation method 3 N 4 (D). 0.1g pure g-C 3 N 4 Mix with 5mL N-GQDs (0.2mg / mL) solution, stir magnetically at room temperature for 12h, c...

Embodiment 3

[0040] Weigh 0.315g (1.5mmol) of citric acid and 0.18g (3mmol) of urea and dissolve them in 30mL of distilled water, stir until a clear solution is formed, and then transfer the solution to a 50mL polytetrafluoroethylene-lined stainless steel autoclave. Heating at 160°C for 4 hours at a constant temperature. Ethanol was added to the obtained product and centrifuged at 8000rpm for 10 minutes to obtain a solid, which was washed several times with ethanol and then dried at 60°C to obtain the final product N-GQDs. The N-GQDs were dispersed into water again.

[0041] Dissolve 10 g of urea in a solution containing 25 mL of N-GQDs (0.2 mg / mL). After the sample is evaporated to dryness, it is calcined in a covered alumina crucible at 20 °C / min to 550 °C for 3 h, and then cooled to room temperature to obtain N-GQDs / g-C 3 N 4 Complex.

[0042] 1.98 mL of H 2 PtCl 6 Aqueous solution (7.723mmol / L) and 100mg of N-GQDs / g-C 3 N 4 The complex was added to 50mL of 20vol% ethanol aqueou...

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Abstract

The invention relates to a nitrogen-doped graphene quantum dot and graphite-phase carbon nitride composite photocatalyst and a preparation method thereof. The catalyst consists of the following components in percentage by mass: 95-98% of g-C3N4 and the balance of N-GQDs. The N-GQDs / g-C3N4 composite photocatalyst has the advantages of greater visible light response range, high catalytic activity, good stability, long service cycle and the like. According to the preparation method for the N-GQDs / g-C3N4 composite photocatalyst, precursor urea of N-GQDs and g-C3N4 is adopted to prepare the N-GQDs / g-C3N4 composite photocatalyst by roasting at a high temperature through one step, so that the conventional process of firstly preparing g-C3N4 and then compounding the N-GQDs with the g-C3N4 is reduced; and N-GQDs can be firmly compounded to the surface of g-C3N4, so that the activity and stability of the catalyst are improved.

Description

technical field [0001] The invention relates to a nitrogen-doped graphene quantum dot (abbreviated as N-GQDs) and graphite phase carbon nitride (abbreviated as g-C) for photocatalytic water decomposition to produce hydrogen 3 N 4 ) composite photocatalyst (denoted as N-GQDs / g-C 3 N 4 )Preparation. It specifically relates to a composite photocatalyst and a preparation method prepared by using urea and N-GQDs as reactants through one-step reaction of high-temperature roasting. After the complex was modified with a small amount of platinum (molecular formula: Pt) nanoparticles, compared with pure g-C 3 N 4 , visible light catalytic water splitting hydrogen production activity has been significantly improved, and has excellent photocatalytic stability. It belongs to the technical field of photocatalysis. Background technique [0002] With the continuous increase of the world population, the increasing level of industrialization and the massive exploitation and use of coal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
CPCB01J27/24B01J35/004B01J37/082
Inventor 牟志刚孙建华张慧刘奉
Owner JIANGSU UNIV OF TECH
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