Modified graphite phase carbon nitride photocatalyst as well as preparation method and application thereof

A carbon nitride photocatalyst technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of insufficient catalytic degradation performance, limit the wide application of copolymerization modification, and photogenerated carriers Easy to recombine and other problems, to improve the utilization rate of electrons and photocatalytic efficiency, increase the number of reactive active sites, and enhance the effect of surface mass transfer process

Active Publication Date: 2018-12-07
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current carbon nitride still has many disadvantages, such as low specific surface area, poor light absorption, and photogenerated carriers are prone to rapid charge recombination.
At present, the methods for modifying PCN include the doping of metal elements or non-metal elements, the construction of semiconductor heterojunctions and copolymerization, among which copolymerization modification is a better modification method, however, the PCN obtained by copolymerization modification The modified graphite phase carbon nitride still has the following problems: low specific surface area, few reactive sites, insufficient light absorption performance, easy recombination of photogenerated carriers, high electron-hole pair recombination rate, insufficient catalytic degradation performance, etc. The existence of the problem severely limits the application range of graphitic carbon nitride
In addition, the existing copolymerization modification methods still have disadvantages such as complicated process, difficult to obtain raw materials, high raw material cost, poor preparation efficiency, and low yield. The existence of this problem also limits the use of copolymerization modification in preparing modified graphite phase nitriding Wide range of applications in carbon

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  • Modified graphite phase carbon nitride photocatalyst as well as preparation method and application thereof
  • Modified graphite phase carbon nitride photocatalyst as well as preparation method and application thereof
  • Modified graphite phase carbon nitride photocatalyst as well as preparation method and application thereof

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Effect test

Embodiment 1

[0033] A modified graphite phase carbon nitride photocatalyst is prepared by calcining urea and salicylic acid as raw materials. The mass ratio of urea and salicylic acid is 1:0.002. The preparation method comprises the following steps:

[0034] Take 10g of urea and 0.02g of salicylic acid, grind them, dissolve them in 20mL of water, stir for 2h, and dry them on an electric furnace (at a temperature of 80°C for 10h) to obtain a precursor. The precursor was placed in a muffle furnace, heated to 550°C at a heating rate of 15°C / min, and kept at 550°C for 2 hours to calcine the precursor. Copolymerization was achieved through calcination to obtain a modified graphite phase carbon nitride light. Catalyst, take out the block after natural cooling, and grind to obtain a modified graphite phase carbon nitride photocatalyst, named CN-SA-0.02.

Embodiment 2

[0036] A modified graphite-phase carbon nitride photocatalyst is prepared by calcining urea and salicylic acid as raw materials. The mass ratio of urea and salicylic acid is 1:0.005. The preparation method specifically includes the following steps:

[0037] Take 10g of urea and 0.05g of salicylic acid, grind them, dissolve them in 20mL of water, stir for 2h, and dry them on an electric furnace to obtain a precursor. The precursor was placed in a muffle furnace, heated to 550°C at a heating rate of 15°C / min, and kept at 550°C for 2 hours to calcine the precursor. Copolymerization was achieved through calcination to obtain a modified graphite phase carbon nitride light. Catalyst, take out the block after natural cooling, and grind to obtain a modified graphite phase carbon nitride photocatalyst, named CN-SA-0.05.

Embodiment 3

[0039] A modified graphite phase carbon nitride photocatalyst is prepared by calcining urea and salicylic acid as raw materials. The mass ratio of urea and salicylic acid is 1: 0.01. The preparation method comprises the following steps:

[0040] Take 10g of urea and 0.1g of salicylic acid, grind them, dissolve them in 20mL of water, stir for 2h, and dry them on an electric furnace to obtain a precursor. The precursor was placed in a muffle furnace, heated to 550°C at a heating rate of 15°C / min, and kept at 550°C for 2 hours to calcine the precursor, and achieve copolymerization through calcination to obtain a modified graphite phase carbon nitride photocatalyst , after natural cooling, the block was taken out and ground to obtain a modified graphite phase carbon nitride photocatalyst, which was named CN-SA-0.1.

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Abstract

The invention discloses a modified graphite phase carbon nitride photocatalyst as well as a preparation method and application thereof. The modified graphite phase carbon nitride photocatalyst is prepared from urea and salicylic acid serving as raw materials by virtue of calcination, wherein a mass ratio of urea to salicylic acid is 1:(0.002-0.02). The modified graphite phase carbon nitride photocatalyst disclosed by the invention has the advantages of being high in specific surface area, wide in light absorption range, low in electron-hole pair recombination rate, excellent in photocatalyticperformance and the like, and has multiple reactive sites, excellent application value and application prospects. The preparation method has the advantages of being simple in process, wide in raw material source, low in cost, high in preparation efficiency, high in yield and the like, is suitable for large-scale preparation and is favorable for industrial production. The modified graphite phase carbon nitride photocatalyst disclosed by the invention can be used for degrading organic pollutants, has the advantages of being simple in process, convenient to operate, low in cost, high in treatmentefficiency, excellent in degradation effect and the like, and has excellent effects of degrading the various organic pollutants.

Description

technical field [0001] The invention belongs to the technical field of material preparation and environmental catalysis, and relates to a preparation method of a porous carbon nitride photocatalyst, in particular to a modified graphite phase carbon nitride photocatalyst and its preparation method and application. Background technique [0002] In the past few decades, people have become more and more aware of the growing environmental problems. As a major source of environmental pollution, water pollution from industrial organic chemicals and agricultural fertilizer discharges has become an urgent problem to be solved. Persistent organic micropollutants such as pharmaceuticals and personal care products, pesticides and herbicides are observed in natural and wastewater. Traditional sewage treatment technologies are difficult to deal with new pollutants. Photocatalysis has proven to be an ideal solution for harnessing solar energy. Photocatalytic technology is a technology t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/34C02F101/38C02F101/36
CPCB01J27/24B01J35/0013B01J35/004C02F1/30C02F2101/308C02F2101/34C02F2101/36C02F2101/38C02F2101/40C02F2305/10
Inventor 周成赟曾光明黄丹莲赖萃张辰程敏史天哲胡亮熊炜平龚小敏李志豪李涛
Owner HUNAN UNIV
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