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Preparation method and application of a carbon dot/graphite-like phase carbon nitride composite photocatalyst

A technology of graphite phase carbon nitride and composite light, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc. The left acupoint is seriously compounded and cannot effectively use sunlight, etc., to achieve the effect of high utilization rate of visible light, high degradation rate of organic matter and obvious effect

Active Publication Date: 2020-09-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, g-C 3 N 4 As a photocatalyst, there are still some problems: photogenerated electron left hole recombination is serious, quantum efficiency is low, the band gap is large, and sunlight cannot be effectively used, etc.
It is very meaningful to research and develop this new type of composite photocatalyst. At present, there is no report on carbon dot-doped carbon nitride composite photocatalyst.

Method used

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  • Preparation method and application of a carbon dot/graphite-like phase carbon nitride composite photocatalyst
  • Preparation method and application of a carbon dot/graphite-like phase carbon nitride composite photocatalyst
  • Preparation method and application of a carbon dot/graphite-like phase carbon nitride composite photocatalyst

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preparation example Construction

[0027] A CDs / g-C of the present invention 3 N 4 The preparation method of composite photocatalyst comprises the following steps:

[0028] (1) Preparation of carbon dots: Mix glucose solution and sodium hydroxide solution and sonicate for 0.5-5 hours, and take the mixed solution. Add hydrochloric acid (the concentration of hydrochloric acid is 0.01~1mol / L, pH=6~8), adjust the pH, add 50~300mL of dehydrated alcohol in the state of stirring, then add magnesium sulfate, magnesium sulfate (0.5wt%~30wt% ) is added in an amount of 1-50mg. After filtration, a clear solution is obtained by stirring and standing. The stirring time is 0.5-5h, and the standing time is 1-48h. Heating at 50-100°C, the solution changes color and solids are produced. The solid is ground to a powder. The concentration of the glucose solution is 0.1-5 mol / L, the concentration of the sodium hydroxide solution is 0.01-1 mol / L, and the molar ratio of the glucose solution and the sodium hydroxide solution is 1-2...

Embodiment 1

[0032] Preparation of carbon quantum dots

[0033] To prepare carbon quantum dots, take 100ml of 1mol / L glucose solution, add 50ml of 1mol / L sodium hydroxide solution, mix and sonicate for 1 to 5 hours, take 20mL of the mixed solution, add hydrochloric acid, adjust pH=7, and add 100mL of absolute ethanol, then add a certain amount of magnesium sulfate, stir for 20min, let stand for 24h, remove excess salt and water, filter to obtain a clear solution, heat at 100°C for 3-5h, the solution turns brown-black and solid carbon is produced . The solid is ground to a powder. From the XRD pattern ( figure 1 ), it can be seen that there is a visible diffraction peak around 2θ=20.7°, indicating that the carbon dots were successfully synthesized.

[0034] g-C 3 N 4 preparation of

[0035] Take a certain amount of melamine and place it in a porcelain crucible with a cover, then put it into a muffle furnace and raise the temperature to 500°C at a rate of 5°C / min, and keep it warm for ...

Embodiment 2

[0037] Preparation of carbon quantum dots

[0038]To prepare carbon quantum dots, take 10ml of 5mol / L glucose solution, add 300ml of 0.5mol / L sodium hydroxide solution, mix and sonicate for 1h, take 20mL of the mixed solution, add hydrochloric acid, adjust pH=6, add 100mL under stirring Then add a certain amount of magnesium sulfate, stir for 20min, let it stand for 24h, remove excess salt and water, filter to obtain a clear solution, heat at 50°C for 3-5h, the solution turns brown-black and solid carbon is produced. The solid is ground to a powder.

[0039] CDs / g-C 3 N 4 Preparation of Binary Compound Semiconductor Materials

[0040] CDs / g-C 3 N 4 Binary compound semiconductor materials are prepared by high-temperature solid-state method. Take a certain amount of prepared carbon dots and mix them with melamine, where CDs / g-C 3 N 4 The mass ratio of composite materials is 5:1 respectively. Grind with an agate mortar for 30 minutes. Then put it in a porcelain crucible...

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Abstract

The invention discloses a preparation method and applications of a carbon dot / graphite like phase carbon nitride composite photocatalyst. The preparation method comprises following steps: 1, carbon dots are prepared, wherein a glucose solution and an alkaline solution are subjected to mixing ultrasonic treatment so as to obtain a mixed solution, the pH value of the mixed solution is adjusted withhydrochloric acid to 6 to 8, absolute ethyl alcohol is added wit stirring, magnesium sulfate is added, stirring is carried out, an obtained mixture is allowed to stand, and is filtered so as to obtaina settled solution, the settled solution is heated to 50 to 100 DEG C until the color of the settled solution is changed and a solid substance is generated, the solid substance is filtered, and is grinded into powder so as to obtain carbon dots; 2, the carbon dots are mixed with melamine at a mass ratio of (0.01-5) : (1-100), and an obtained product is delivered into a muffle furnace for calcining at 200 to 700 DEG C so as to obtain the CDs / g-C3N4 composite photocatalyst. Carbon dots possess excellent up conversion properties, so that the CDs / g-C3N4 composite photocatalyst is capable of conversing absorbed light with long wave length into light with short wave length, increasing visible light utilization rate, and increasing photocatalytic activity.

Description

technical field [0001] The invention belongs to the technical field of visible light catalyst materials, and relates to a CDs (carbon dot) / g-C 3 N 4 (Graphite-like carbon nitride) composite photocatalyst preparation method. Background technique [0002] In recent years, the resource crisis and environmental pollution problems faced by people have become more and more serious. The impact of air pollution and water pollution on human life is becoming more and more obvious. Photocatalysts use sunlight to effectively degrade pollutants in the environment. In addition, photocatalysts are also widely used in splitting water to produce hydrogen energy. Recently, graphitic carbon nitride (g-C 3 N 4 ) has attracted great attention as a metal-free semiconductor photocatalyst. Graphite phase carbon nitride can be obtained by thermal condensation polymerization and electropolymerization of nitrogen-rich substances, the preparation process is simple, and the raw materials are cheap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/38
Inventor 樊国栋樊苗苗郭萌田孖存
Owner SHAANXI UNIV OF SCI & TECH
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