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Ternary polymerization carbon nitride photocatalytic material as well as preparation method and application thereof

A ternary copolymerization of carbon nitride light and a ternary copolymerization of carbon nitride light technology, applied in the field of visible light catalysis, can solve the problems of reducing the separation efficiency of photogenerated electron-hole pairs, unable to effectively utilize solar energy, destroying semiconductor characteristics, etc. Utilization and conversion of light energy, improving photocatalytic efficiency, and reducing the effect of band gap width

Inactive Publication Date: 2017-11-07
HUNAN UNIV
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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 also has its own shortcomings that cannot be ignored: small specific surface area, high exciton binding energy for photogenerated carriers, low quantum efficiency and large band gap, which cannot effectively use solar energy, etc.
Although pure cyanamide is copolymerized with barbituric acid, the obtained product has excellent visible light absorption ability, but the product is prone to serious agglomeration, which reduces the separation efficiency of photogenerated electron-hole pairs, and excessive barbituric acid Also destroys semiconductor features

Method used

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  • Ternary polymerization carbon nitride photocatalytic material as well as preparation method and application thereof
  • Ternary polymerization carbon nitride photocatalytic material as well as preparation method and application thereof
  • Ternary polymerization carbon nitride photocatalytic material as well as preparation method and application thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Ternary copolymerized carbon nitride photocatalytic material (layered modified mg-C 3 N 4 ) preparation

[0031] A ternary copolymerized carbon nitride photocatalytic material of this embodiment is prepared from melamine, cyanuric acid and barbituric acid. The ternary copolymerized carbon nitride photocatalytic material has a porous structure, and the specific surface area 179m 2 / g, the pore diameter is 0.56cm 3 / g. Specifically include the following steps:

[0032] S1, get 10g melamine, 10g cyanuric acid, 1g barbituric acid (in other embodiments, 2g barbituric acid can also obtain the same technical effect), grind, dissolve in 100ml water (in other embodiments, The same technical effect can also be obtained by using ethanol), stirring at room temperature for 2 hours, and drying on an electric furnace at 80°C to obtain a precursor.

[0033] S2. Put the precursor in a muffle furnace, heat it to 550°C at a heating rate of 3°C / min, and keep it at 550°C fo...

Embodiment 2

[0034] Example 2: Ternary copolymerized carbon nitride photocatalytic material (layered modified mg-C 3 N 4 ) preparation

[0035] A ternary copolymerized carbon nitride photocatalytic material in this embodiment is prepared from melamine, cyanuric acid and barbituric acid as raw materials, and the ternary copolymerized carbon nitride photocatalytic material has a porous structure. Specifically include the following steps:

[0036] S1. Take 10g of melamine, 10g of cyanuric acid, and 2g of barbituric acid (in other embodiments, 1g of barbituric acid can also achieve the same technical effect), grind, dissolve in 100ml of water, stir at room temperature for 2h, and heat The precursor was obtained by drying in a furnace at 80°C.

[0037] S2. Put the precursor in a muffle furnace, heat it to 400°C at a heating rate of 3°C / min, and keep it at 400°C for 1 hour; continue heating at a heating rate of 3°C / min to 550°C, and keep it at 550°C After 3 hours, after natural cooling, the ...

Embodiment 3

[0043] Example 3: Application of carbon nitride photocatalytic material and ternary copolymerized carbon nitride photocatalytic material to degrade Rhodamine B in water under visible light

[0044] The experiment of degrading Rhodamine B was carried out according to the carbon nitride photocatalytic material in Comparative Example 1 and the ternary copolymerized carbon nitride photocatalytic material in Example 1, wherein the concentration of Rhodamine B was 10 mg / L.

[0045] Take respectively 100 mg of the carbon nitride photocatalytic material in Comparative Example 1 and the ternary copolymerized carbon nitride photocatalytic material in Example 1, respectively place them in 100 ml of the above rhodamine B solution, stir in a dark room for 60 minutes, then place the solution in In the visible light source, take 4ml of rhodamine B solution every 10 minutes, measure the characteristic peak of rhodamine B in the solution with a UV-visible spectrophotometer, and calculate the de...

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Abstract

The invention discloses a ternary polymerization carbon nitride photocatalytic material, which is prepared by taking melamine, cyanuric acid and barbituric acid as raw materials, wherein the mass ratio of the melamine to the cyanuric acid to the barbituric acid is equal to 1 to 1 to (0.1-0.2); the ternary polymerization carbon nitride photocatalytic material has a porous structure. A preparation method comprises of the photocatalytic material comprises the following steps: grinding the melamine, the cyanuric acid and the barbituric acid, then dissolving into a solvent, stirring, and drying to obtain a precursor; calcining the precursor obtained in the step S1, and grinding to obtain the ternary polymerization carbon nitride photocatalytic material. The ternary polymerization carbon nitride photocatalytic material is large in specific surface area and narrow in band gap width and can be used for decomposing organic pollutants when being irradiated by visible light.

Description

technical field [0001] The invention belongs to the field of visible light catalysis, and in particular relates to a ternary copolymerized carbon nitride photocatalytic material and a preparation method and application thereof. Background technique [0002] Photocatalytic technology is a technology that uses photocatalysts to catalyze reactions under light irradiation. It is generally a reaction between multiple phase states. It is a green technology that has important application prospects in the fields of energy and the environment. Among many semiconductor catalysts, graphitic carbon nitride (g-C 3 N 4 ) with a band gap of 2.7eV is the most stable allotrope in carbon nitride, with a layered structure, and has good application prospects in catalysis and energy storage. g-C 3 N 4 The interlayer structure has a certain layer spacing and theoretically has a larger specific surface area, which has certain advantages in pollutant adsorption and accelerated electron transfer...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C01B21/082C02F101/30C02F101/38
CPCC01B21/0605C02F1/30B01J27/24C01P2004/04C02F2305/10C02F2101/40C02F2101/38C02F2101/30B01J35/39B01J35/00B01J35/30
Inventor 周成赟曾光明黄丹莲赖萃张辰程敏胡亮熊炜平万佳刘洋黄超许飘
Owner HUNAN UNIV
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