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Self-assembled copolymerized carbon nitride photocatalytic composite material, and preparation method and application thereof

A composite material and self-assembly technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of limiting the application range of graphite phase carbon nitride, limiting the wide application of copolymerization, and catalytic degradation performance Insufficient and other problems, to achieve the effect of improving the utilization rate of electrons and photocatalytic efficiency, increasing the number of reactive active sites, and improving light utilization efficiency

Active Publication Date: 2018-11-30
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with melamine and dicyandiamide, urea can also be used as a copolymerization method to prepare g-C 3 N 4 However, the copolymerized carbon nitride materials prepared by urea copolymerization still have the following problems: low specific surface area, few reactive active sites, insufficient light absorption performance, easy recombination of photogenerated carriers, electron-hole pair recombination rate High, insufficient catalytic degradation performance, etc., the existence of these problems seriously limits the application range of graphitic carbon nitride
In addition, the existing copolymerization method using urea as raw material still has disadvantages such as complex process, high raw material cost, poor preparation efficiency, and low yield. The existence of this problem also limits the wide application of the copolymerization method in the preparation of graphite phase carbon nitride. application

Method used

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  • Self-assembled copolymerized carbon nitride photocatalytic composite material, and preparation method and application thereof
  • Self-assembled copolymerized carbon nitride photocatalytic composite material, and preparation method and application thereof
  • Self-assembled copolymerized carbon nitride photocatalytic composite material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A self-assembled copolymerized carbon nitride photocatalytic composite material is prepared by calcining urea and thiobarbituric acid as raw materials. The mass ratio of urea and thiobarbituric acid is 1:0.02. The preparation method includes The following steps:

[0035] Take 10g of urea and 0.2g of thiobarbituric acid, grind them, dissolve them in 100mL of water, stir for 2h, and dry them on an electric furnace (at 80°C for 10h) to obtain a precursor. Put the precursor into a quartz crucible and place the quartz crucible in a muffle furnace, cover it, and perform calcination under normal conditions (that is, without protective gas), specifically: heating to 400 °C at a heating rate of 5 °C / min ℃, keep it at 400°C for 1 hour, continue heating to 550°C at a heating rate of 5°C / min, keep it at 550°C for 3 hours, take out the block after natural cooling, and grind it for 20 minutes to obtain self-assembled copolymerized carbon nitride light The catalytic composite materia...

Embodiment 2

[0043] An application of a self-assembled copolymerized carbon nitride photocatalytic composite material in degrading organic pollutants, specifically utilizing the self-assembled copolymerized carbon nitride photocatalytic composite material to degrade organic pollutants in water bodies, comprising the following steps:

[0044] Take the self-assembled copolycarbon nitride photocatalytic composite (TCN) prepared in Example 1 and the carbon nitride photocatalyst material (g-CN) prepared in Comparative Example 1 3 N 4 ), each 100mg, respectively placed in 100mL tetracycline solution with a concentration of 10mg / L, stirred in a dark environment (dark room) for 60 minutes to reach adsorption equilibrium, and then placed in a visible light source (xenon lamp) for photocatalytic reaction to complete the Degradation of organic pollutants in water bodies.

[0045] During the photocatalytic reaction, 4 mL of tetracycline solution was taken every 10 minutes, and the characteristic peak...

Embodiment 3

[0048] An application of a self-assembled copolymerized carbon nitride photocatalytic composite material in degrading organic pollutants, specifically utilizing the self-assembled copolymerized carbon nitride photocatalytic composite material to degrade organic pollutants in water bodies, comprising the following steps:

[0049] Take the self-assembled copolycarbon nitride photocatalytic composite (TCN) prepared in Example 1 and the carbon nitride photocatalyst material (g-CN) prepared in Comparative Example 1 3 N 4 ), each 100 mg, respectively placed in 100 mL of sulfamethazine solution with a concentration of 10 mg / L, stirred in a dark environment (dark room) for 60 minutes to reach adsorption equilibrium, and then placed in a visible light source (xenon lamp) for photocatalysis reaction to complete the degradation of organic pollutants in water.

[0050] During the photocatalytic reaction process, take 4mL sulfamethazine solution every 10 minutes, measure the characteristi...

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Abstract

The invention discloses a self-assembled copolymerized carbon nitride photocatalytic composite material, and a preparation method and application thereof. The self-assembled copolymerized carbon nitride photocatalytic composite material is prepared through calcination by taking urea and thiobarbituric acid as raw materials, wherein the mass ratio of the urea to thiobarbituric acid 1:(0.001-0.02).The self-assembled copolymerized carbon nitride photocatalytic composite material has the advantages of high specific surface area, multiple reactive sites, wide light absorption range, low electron-hole pair recombination rate, good photocatalytic performance and the like, and has a good application value and application prospect. The preparation method has the advantages of simple process, widesource of the raw materials, low cost, high preparation efficiency, high yield and the like, is suitable for large-scale preparation, and is beneficial to industrial production. The composite materialprovided by the invention can be used to degrade organic pollutants, has the advantages of simple process, convenient operation, low cost, high treatment efficiency, good degradation effect and the like, and has good degradation effects for various organic pollutants.

Description

technical field [0001] The invention belongs to the field of visible light catalysis, and relates to a self-assembled copolymerized carbon nitride photocatalytic composite 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. Graphite carbonitrides (g-C 3 N 4 ) have attracted considerable interest due to their excellent physicochemical stability and facile preparation methods. The band gap of carbon nitride is suitable for various applications of visible light catalysis, such as hydrogen generation under visible light irradiation, pollutant degradation and H 2 o 2 produce. However, practical applications are limited by fast charge carrier recombination, low ...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/08C02F1/30C02F101/38C02F101/34
CPCC02F1/30B01J27/24B01J37/082C02F2305/10C02F2101/38C02F2101/34C02F2103/343B01J35/39
Inventor 曾光明周成赟黄丹莲赖萃程敏段阿冰鲁玥史天哲姜丹妮熊炜平汪文军周曼
Owner HUNAN UNIV
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