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Carbon dot modified oxygen-doped carbon nitride photocatalyst as well as preparation method and application thereof

A carbon nitride light and oxygen doping technology, applied in the field of photocatalysis, can solve the problems of high recombination rate of photogenerated electrons and holes, limit the practical application of photocatalysis technology, and cannot effectively use visible light, etc., and achieve low cost and high efficiency. Application potential and use value, effects of strong electronic storage and transfer capabilities

Inactive Publication Date: 2018-12-14
GUANGDONG UNIV OF 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 It can only absorb light within 475nm and cannot effectively use visible light
Moreover, the recombination rate of photogenerated electrons and holes of carbon nitride is high, which leads to the inhibition of its catalytic activity.
At present, commercially produced photocatalytic materials can only use ultraviolet light, which greatly limits the practical application of photocatalytic technology. Therefore, the development of high-efficiency photocatalytic materials is also the key to the further application of photocatalysis in environmental pollution control.

Method used

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  • Carbon dot modified oxygen-doped carbon nitride photocatalyst as well as preparation method and application thereof
  • Carbon dot modified oxygen-doped carbon nitride photocatalyst as well as preparation method and application thereof
  • Carbon dot modified oxygen-doped carbon nitride photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A CDs / O-C 3 N 4 The preparation of composite photocatalyst comprises the following specific steps:

[0033] 1. Weigh 3g of citric acid and 1g of urea, add 10ml of ultrapure water to them, dissolve them by ultrasonic waves, transfer them to a polytetrafluoroethylene reactor and react at 180°C for 5h; wait for them to cool to room temperature to obtain a brown aqueous solution, and dissolve the solution Centrifuge to remove large particles, and obtain a 20 g / L CDs solution at constant volume.

[0034] 2. Weigh 120g of semicarbazide hydrochloride and place it in a good-quality alumina crucible, transfer it into a muffle furnace and calcine it at 550°C for 5 hours at a heating rate of 5°C / min. After it is cooled to room temperature, agate grinding Bowl grinding, sieving to obtain oxygen-doped carbon nitride photocatalyst (O-C 3 N 4 ).

[0035] 3. Weigh 0.8gO-C 3 N 4 Place in an alumina crucible, add 15mL of ultrapure water, 5mL of ethanol and 0.2mL of CDs solution in...

Embodiment 2

[0042] 1. Weigh 2g of citric acid and 1g of urea, add 6ml of ultrapure water to it, dissolve it with ultrasonic waves, transfer it to a polytetrafluoroethylene reactor and react at 170°C for 3 hours; wait for it to cool to room temperature, and obtain a brown aqueous solution. Centrifuge to remove large particles to obtain CDs solution.

[0043] 2. Weigh 80g of semicarbazide hydrochloride and place it in a good-quality alumina crucible, transfer it into a muffle furnace and calcine it at 560°C for 3 hours with a heating rate of 4°C / min. Bowl grinding, sieving to obtain oxygen-doped carbon nitride photocatalyst (O-C 3 N 4 ).

[0044] 3. Weigh 1gO-C 3 N 4 Place in an alumina crucible, add 12mL of ultrapure water, 4mL of ethanol and 0.1mL of CDs solution into it, after ultrasonic dissolution, heat and stir in a water bath at 50°C until dry, put it in a muffle furnace and calcinate at 280°C 2h, the heating rate is 3°C / min, after it is cooled to room temperature, it is ground ...

Embodiment 3

[0046] 1. Weigh 4g of citric acid and 1g of urea, add 12ml of ultrapure water to it, dissolve it with ultrasonic waves, transfer it to a polytetrafluoroethylene reactor and react at 190°C for 6h; wait for it to cool to room temperature to obtain a brown aqueous solution, and dissolve the solution Centrifuge to remove large particles to obtain CDs solution.

[0047] 2. Weigh 150g of semicarbazide hydrochloride and place it in a good-quality alumina crucible, transfer it into a muffle furnace and calcine it at 540°C for 5 hours, with a heating rate of 6°C / min. After it is cooled to room temperature, agate grinding Bowl grinding, sieving to obtain oxygen-doped carbon nitride photocatalyst (O-C 3 N 4 ).

[0048] 3. Weigh 1gO-C 3 N 4 Place in an alumina crucible, add 16mL of ultrapure water, 6mL of ethanol and 1mL of CDs solution into it, after ultrasonic dissolution, heat and stir in a water bath at 70°C until dry, put it in a muffle furnace and calcine at 320°C for 4h , the ...

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Abstract

The invention belongs to the technical field of photocatalysis and discloses a carbon dot modified oxygen-doped carbon nitride photocatalyst as well as a preparation method and an application thereof.The method comprises steps as follows: citric acid and urea are added to ultrapure water and subjected to reaction at 170-190 DEG C after being ultrasonically dissolved, a mixed solution is cooled toroom temperature, centrifuged, dried and subjected to constant-volume treatment with the ultrapure water, and a CDs solution is obtained; semicarbazide hydrochloride is subjected to calcining reaction at 540-560 DEG C, cooled, ground and sieved, and O-C3N4 is obtained; O-C3N4 is added to a crucible, the ultrapure water and ethanol are added, then the CDs solution is added, after ultrasonic dissolving, water-bath heating and stirring are performed until the mixture is dry, the calcining reaction is performed at 280-320 DEG C, a product is cooled, ground and sieved, and the photocatalyst is obtained. With the adoption of a thermo polymerization method, the synthetic process is simple, repeatability is good, and basic conditions for large-scale production are provided; the CDs in the photocatalyst can convert long-wavelength light into short-wavelength light, the catalytic effect is improved, and diclofenac can be degraded under different light sources.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, in particular to a carbon point-modified oxygen-doped carbon nitride photocatalyst and its preparation method and application. Background technique [0002] Diclofenac has strong anti-rheumatic, anti-inflammatory, analgesic and antipyretic effects. At present, diclofenac has become one of the best-selling antipyretic, analgesic and anti-inflammatory drugs in the world. Due to the wide use of DCF and the large amount of industrial production, on the one hand, it can be directly discharged by the production enterprise; on the other hand, after being taken by people, DCF cannot be completely metabolized, and part of it will directly enter the urban sewage system with excrement. Trace concentrations of DCF can generate drug-resistant pathogens in the environment, negatively affecting ecosystems and human health. However, the traditional sewage treatment technology has a poor treatment effect...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/36C02F101/34
CPCC02F1/30B01J27/24C02F2101/36C02F2101/34C02F2305/10B01J35/39
Inventor 刘国光谭翠雯张钱新吕文英陈平
Owner GUANGDONG UNIV OF TECH
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