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Carbon dot and graphite phase carbon nitride compound photocatalyst as well as preparation method and application thereof

A technology of graphitic carbon nitride and composite light, which is applied in the field of photocatalysis, can solve the problems of ineffective use of solar energy, high recombination rate of photogenerated carriers, and low utilization rate of visible light, achieving high application prospects and use value, Improve the catalytic ability and inhibit the effect of recombination

Inactive Publication Date: 2017-12-29
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure g-C 3 N 4 There are still some unavoidable disadvantages
On the one hand, carbon nitride has a forbidden band width of 2.7eV, which can only absorb and utilize light within 475nm, and has a low utilization rate of visible light, which cannot effectively utilize solar energy.
On the other hand, the photogenerated carrier recombination rate of carbon nitride is high, and its catalytic activity is inhibited, which greatly limits its large-scale application.

Method used

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  • Carbon dot and graphite phase carbon nitride compound photocatalyst as well as preparation method and application thereof
  • Carbon dot and graphite phase carbon nitride compound photocatalyst as well as preparation method and application thereof
  • Carbon dot and graphite phase carbon nitride compound photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0033] 1. Weigh 1g of glucose, add 0.2ml of ethylenediamine and 15ml of ultrapure water to it, dissolve it by ultrasonic, transfer it to a polytetrafluoroethylene high-temperature hydrothermal reactor and react at 160°C for 3h. After it was cooled to room temperature, a brown aqueous solution was obtained. The solution was centrifuged to remove large particles, dried and ground to obtain a brown-black CDots powder.

[0034] 2. Weigh 3g of dicyandiamide and place it in an alumina crucible, add 0.01g of CDots powder and 15ml of ultrapure water into it, ultrasonically dissolve it and place it in an oven at 70°C, and transfer the crucible to a muffler after the water is completely evaporated In the furnace, the temperature was raised to 500°C at a rate of 3°C / min and kept at this temperature for 3 hours. After cooling to room temperature, grind and sieve to obtain CDots...

Embodiment 2

[0041] A CDots / g-C 3 N 4 The preparation of composite photocatalyst comprises the following specific steps:

[0042] 1. Weigh 3g of glucose, add 0.6ml of ethylenediamine and 10ml of ultrapure water to it, dissolve it by ultrasonic, transfer it to a polytetrafluoroethylene high-temperature hydrothermal reactor and react at 150°C for 5h. After it was cooled to room temperature, a brown aqueous solution was obtained. The solution was centrifuged to remove large particles, dried and ground to obtain a brown-black CDots powder.

[0043] 2. Weigh 1g of dicyandiamide and place it in an alumina crucible, add 0.1g of CDots powder and 10ml of ultrapure water into it, ultrasonically dissolve it and place it in an oven at 70°C, and transfer the crucible to a muffler after the water is completely evaporated In the furnace, the temperature was raised to 450°C at a rate of 2°C / min and kept at this temperature for 2 hours. After cooling to room temperature, grind and sieve to obtain CDots / ...

Embodiment 3

[0045] A CDots / g-C 3 N 4 The application of composite photocatalyst in antibiotic wastewater treatment comprises the following steps:

[0046] 1. Weigh 50 mg of CDots / g-C prepared in Implementation 1 3 N 4 The composite photocatalyst was placed in a photolysis tube, 50ml of ciprofloxacin solution with a concentration of 4mg / L was added, and placed in a photochemical reaction apparatus for 30 minutes to absorb in the dark.

[0047] 2. Use a 300w xenon lamp to configure a 290nm filter for photocatalytic reaction, and use liquid chromatography to measure the concentration C of the remaining ciprofloxacin in the solution after 40 minutes of reaction. According to the formula N=(C 0 -C)*100% calculates the removal rate N of ciprofloxacin, where C 0 is the initial concentration of ciprofloxacin.

[0048] 3. Weigh 50 mg of g-C prepared in Comparative Example 1 3 N 4 , repeat steps 1 and 2 to obtain the removal rate of catalyst to ciprofloxacin.

[0049] Table 1 is CDots / g-C ...

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Abstract

The invention discloses a carbon dot and graphite phase carbon nitride compound photocatalyst as well as a preparation method and application thereof. The method comprises the following steps: adding glucose into ethidene diamine and superpure water, performing a reaction at 150-160 DEG C after ultrasonic dissolution, centrifugalizing the obtained solution which is cooled to room temperature to remove large particles, and drying and grinding to obtain carbon dot powder; and then adding dicyandiamide into the carbon dot powder and the superpure water, drying the mixture to calcine at 450-550 DEG G after ultrasonic dissolution, and grinding and sieving the mixture to obtain the carbon dot and graphite phase carbon nitride compound photocatalyst after being cooled to room temperature. By adopting a thermal aggregation method, the photocatalyst is simple in synthetic process and good in repeatability and has basic conditions of large-scaled production. The carbon dot and graphite phase carbon nitride compound photocatalyst can convert long wave light into short wave light which can be used by graphite phase carbon nitride, so that the catalytic ability of the graphite phase carbon nitride is improved. The compound photocatalyst can degrade antibiotics under sunlight.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and more specifically relates to a composite photocatalyst of carbon dots and graphite-phase carbon nitride and its preparation method and application. Background technique [0002] Antibiotics are widely used in human medicine and animal breeding. Most antibiotic drugs cannot be completely metabolized in human and animal organisms, and most of them are excreted with feces in their original form and enter the environment. Antibiotics entering the environment can induce pathogenic bacteria to develop drug resistance, thus causing serious harm to the ecosystem and human health. Therefore, the development of efficient water treatment technology is of great significance for the removal of antibiotics. [0003] In recent years, photocatalytic oxidation technology has provided a new way to treat wastewater and remove toxic substances in the environment. Graphite carbon nitride (g-C 3 N 4 ) a...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30
CPCC02F1/30B01J21/18B01J27/24B01J37/08C02F2305/10C02F2103/343B01J35/19B01J35/39Y02W10/37
Inventor 刘国光王枫亮冯义平王盈霏吕文英
Owner GUANGDONG UNIV OF TECH
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