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Method for preparing porous flake-like graphite phase carbon nitride on large scale, and application thereof

A phase carbon nitride and flake graphite technology, applied in the field of porous flake graphite phase carbon nitride, to achieve the effect of strong controllability, strong ability and large specific surface area

Inactive Publication Date: 2016-02-03
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, currently regarding g-C 3 N 4 The synthesis is still in the research of small batch preparation in the laboratory, and the porous sheet-like g-C with high photocatalytic activity is prepared in large batches. 3 N 4 Haven't seen the report yet

Method used

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  • Method for preparing porous flake-like graphite phase carbon nitride on large scale, and application thereof
  • Method for preparing porous flake-like graphite phase carbon nitride on large scale, and application thereof
  • Method for preparing porous flake-like graphite phase carbon nitride on large scale, and application thereof

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Experimental program
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Effect test

Embodiment 1

[0025] 1) Preparation of porous flake g-C in small batches 3 N 4 : In a small volume reactor, take different quality urea (M 0 =2.5g, 6.25g, 12.5g, 18g, 25g, 35g, 45g), heat up to 600°C at a heating rate of 3°C per minute, calcinate for 2 hours, and cool down to room temperature naturally. Disperse the obtained powder in an appropriate amount of ethanol, ultrasonically treat it for 30 minutes, and dry it quickly at 70°C and -0.1MPa vacuum to obtain the desired porous sheet g-C 3 N 4 (weigh the corresponding weight M 1 ).

[0026] 2) Large-scale preparation of porous sheet-like g-C 3 N 4 : In large-volume reactors, expand the scale of preparation and increase the amount of urea input (M 0 =100g, 300g, 500g, 750g, 1000g), heated up to 600°C at a heating rate of 3°C per minute, calcined for 2 hours, and cooled down to room temperature naturally. Disperse the obtained powder in an appropriate amount of ethanol, ultrasonically treat it for 30 minutes, and dry it quickly at ...

Embodiment 2

[0031] The preparation concentration is 2.5×10 -5 The rhodamine B solution of mol / L uses the porous flake graphite phase carbon nitride prepared in embodiment 1 (1) and (2) respectively, gets 10mg and joins in the 60mL degradant solution, stirs 30min to make the target degradant in The surface of the photocatalyst reached adsorption-desorption equilibrium, during which samples were taken and analyzed every 10 minutes. Afterwards, the solution was illuminated (300W xenon lamp, visible light, wavelength 420nm<λ<780nm), and samples were taken and analyzed at intervals of 5 minutes to observe the concentration change of the target degradation product in the solution.

[0032] Such as Figure 4, it can be seen that the porous sheet-like g-C prepared in large batches and small batches 3 N 4 The photocatalytic activity is not much different, and Rhodamine B can be completely decomposed within 25 minutes.

[0033] Figure 5 The UV-Vis absorption spectrum during the degradation pr...

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Abstract

The invention discloses a method for preparing porous flake-like graphite phase carbon nitride with efficient visible light photocatalytic degradation activity of pollutants on a large scale, and belongs to the technical field of polymeric materials and photocatalysis. A thermopolymerization method is adopted, and urea is taken as raw materials and is subjected to certain processing through a direct calcination method in an aluminum reactor to obtain efficient porous flake-like graphite phase carbon nitride photocatalyst. The yield and an input raw material amount have a good linear relationship, and mass preparation can be simply realized. The obtained graphite phase carbon nitride is flake like, has a large specific surface area and favorable visible light absorption capability and especially has efficient visible light photocatalytic degradation capability of organic pollutants. The technology of the invention can be used for the purification processing of organic maters in industrial wastewater and municipal domestic wastewater.

Description

technical field [0001] The invention belongs to the technical field of polymer materials and photocatalysis, and specifically relates to a method for mass-preparing porous flake graphite phase carbon nitride with high-efficiency visible light photocatalytic degradation activity for pollutants. Background technique [0002] At present, with the development of industry, the accompanying environmental problems are becoming more and more prominent. Water pollution, air pollution, solid waste pollution and other phenomena emerge in an endless stream. How to deal with the environmental pollution problems we are facing today has attracted more and more attention. As the source of life, water is one of the most basic substances for human beings to survive. How to control water pollution is naturally the focus of attention. Commonly used sewage treatment technologies such as: physical adsorption, coagulation, air flotation, etc. These methods transfer organic pollutants in water to t...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10C02F1/30C02F101/38
CPCY02W10/37
Inventor 陶霞方华斌郑言贞
Owner BEIJING UNIV OF CHEM TECH
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