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Carbon nitride photocatalytic material with high visible light absorption and its preparation method and application

A carbon nitride and dosage ratio technology, applied in the field of materials, can solve the problems of low photogenerated electron hole separation efficiency, small specific surface area of ​​carbon nitride, low photocatalytic activity, etc., and achieve excellent photocatalytic degradation activity and mild reaction conditions. , The effect of rich and clean raw materials

Active Publication Date: 2021-10-29
RENMIN UNIVERSITY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Although some progress has been made in the research of graphitic carbon nitride in the field of photocatalysis, the obtained carbon nitride often has a small specific surface area, a large band gap (about 2.7eV), and an absorption band edge lower than 460nm. Insufficient absorption, low separation efficiency of photogenerated electrons and holes, so the utilization rate of solar energy is low, and thus the photocatalytic activity is not high

Method used

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  • Carbon nitride photocatalytic material with high visible light absorption and its preparation method and application
  • Carbon nitride photocatalytic material with high visible light absorption and its preparation method and application
  • Carbon nitride photocatalytic material with high visible light absorption and its preparation method and application

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Embodiment 1

[0039] Example 1, g-CN M preparation of

[0040] 1) Take 10g of melamine for thermal polymerization in a muffle furnace. The specific conditions are to heat up to 500°C at 10°C / min, keep it for 4h, and cool down naturally to obtain the precursor g-CN, which is ground evenly for later use (the yield is about 50%) .

[0041] 2) Weigh 600 mg of the above sample, grind it with KCl (3.3 g) and LiCl (2.7 g) in a nitrogen atmosphere in a glove box to obtain 6.6 g of a mixed powder sample, and place the mixed powder sample in a tube furnace under a nitrogen atmosphere Raise the temperature to 550°C at a rate of 10°C / min (nitrogen flow rate 2L / min), keep it for 4h, cool down naturally, grind evenly, wash with deionized water several times, and vacuum dry at 60°C under 0.1MPa for 12h to obtain 595mg of intermediate samples, namely salt Melted g-CN.

[0042] 3) Weigh 50 mg of the salt-melted g-CN of the above intermediate sample and add it to 50 mL of isopropanol, drop 4 drops (about ...

Embodiment 2

[0048] Able to achieve efficient photocatalytic degradation of water pollutant methylene blue: 20mg catalyst g-CN M Added to 100mL of methylene blue (Methylene Blue, MB) solution with a concentration of 30mg / L, fully stirred for 60min in a dark environment to achieve the adsorption and desorption equilibrium of the catalyst to the target degradation product solution, and the adsorption capacity of the sample to the dye was also very prominent. After equilibrium About 80% of the dye was adsorbed, and then the solution was placed under a 300W xenon lamp light source and a filter of λ≥470nm was irradiated. Samples were taken every 1h, and the degradation was complete after 3h, showing excellent degradation efficiency, such as figure 2 shown.

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Abstract

The invention discloses a carbon nitride photocatalytic material with high visible light absorption, a preparation method and application thereof. For the first time, the present invention adopts the combined treatment method of "molten salt-hydrogen peroxide" to modify carbon nitride, which increases the specific surface area of ​​the sample, changes the electronic state inside the carbon nitride material, and the band gap (band gap) is changed from the original 2.75eV becomes 2.02eV, and the absorption band edge extends from the original 460nm to 660nm, which improves the visible light absorption ability of the catalyst and greatly improves the separation efficiency of photogenerated electrons and holes. The invention has the advantages of simple preparation method, less energy consumption, low cost, abundant and clean raw materials, and mild reaction conditions. It is a good visible light-responsive photocatalyst. It has important application prospects in the treatment of organic wastewater.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a carbon nitride photocatalytic material with high visible light absorption and a preparation method and application thereof. Background technique [0002] Although graphitic carbon nitride has made some progress in the field of photocatalysis, the obtained carbon nitride often has a small specific surface area, a large band gap (about 2.7eV), and an absorption band edge lower than 460nm. Insufficient absorption, low photogenerated electron-hole separation efficiency, and thus low solar energy utilization, resulting in low photocatalytic activity. Contents of the invention [0003] The object of the present invention is to provide a carbon nitride photocatalyst material with high visible light absorption and its preparation method and application. [0004] The method for preparing a carbon nitride material provided by the present invention comprises: oxidatively modifying salt-melted g-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C02F1/30C02F1/28B01J20/04B01J20/30
Inventor 葛志统吕荣于安池
Owner RENMIN UNIVERSITY OF CHINA
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