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Carbon nitride photocatalysis material with high absorption of visible light as well as preparation method and application thereof

A technology of carbon nitride and photocatalysis, which is applied in the field of materials, can solve the problems of low separation efficiency of photogenerated electrons and holes, small specific surface area of ​​carbon nitride, and low utilization rate of solar energy, and achieve excellent photocatalytic degradation activity and mild reaction conditions , the effect of increasing the specific surface area of ​​the sample

Active Publication Date: 2019-06-14
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 photocatalysis material with high absorption of visible light as well as preparation method and application thereof
  • Carbon nitride photocatalysis material with high absorption of visible light as well as preparation method and application thereof
  • Carbon nitride photocatalysis material with high absorption of visible light as well as preparation method and application thereof

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Embodiment 1

[0040] Example 1, g-CN M preparation of

[0041] 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%) .

[0042] 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.

[0043] 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

[0049] 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 is adsorbed, and then the solution is placed under a 300W xenon lamp light source and a filter of λ≥470nm is started to irradiate, and samples are taken every 1h. After 3h, the degradation is complete, showing excellent degradation efficiency, such as figure 2 shown.

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Abstract

The invention discloses a carbon nitride photocatalysis material with high absorption of visible light as well as a preparation method and application thereof. A molten salt-hydrogen peroxide combinedtreatment method is firstly used for modifying carbon nitride; the sample specific surface area is increased; the electronic state in the carbon nitride material is changed; forbidden bandwidth (bandgap) is changed from the original 2.75 eV to 2.02 eV; the absorption band edge extends from the original 460 nm to 660 nm; the visible light absorption capability of the catalyst is improved; the photogenerated electron hole separation efficiency is also greatly improved. The carbon nitride photocatalysis material has the advantages of simple preparation method, low energy consumption, low cost,rich and clean raw materials, mild reaction condition and the like, can be used as a good visible-light response type photocatalyst, is firstly reported, shows excellent photocatalysis degradation activity, and has an important application prospect 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 Applications(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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