Preparation method of O-doped graphite phase carbon nitride nanosheet powder

A technology of graphite phase carbon nitride and nanosheets, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of low photon efficiency of photogenerated electrons and holes, and achieve high specific surface area , Overcoming the effect of being extremely easy to quickly compound and easy to control

Inactive Publication Date: 2018-08-03
XIAN UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0005] The purpose of this invention is to provide a kind of preparation method of O-doped graphite phase carbon nitride nanosheet powder, which solves the problem of existing g-C 3 N 4 For the problems of photogenerated electrons and holes that are easy to recombine rapidly and have low photon quantum efficiency, and improve their forbidden band width

Method used

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  • Preparation method of O-doped graphite phase carbon nitride nanosheet powder
  • Preparation method of O-doped graphite phase carbon nitride nanosheet powder

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Embodiment 1

[0032]Step 1, according to the mass ratio of melamine and deionization is 1:10, the volume ratio of hydrogen peroxide and deionized water with a mass concentration of 30% is 1:60, add melamine, hydrogen peroxide and deionized water to clean polytetrafluoroethylene Mix in the lining and stir evenly; put the above-mentioned polytetrafluoroethylene lining into the corresponding stainless steel jacket, tighten it, put it in an oven, keep it warm at 140°C for 12h, and after cooling with the furnace, use the solid-liquid mixture obtained Ionized water and absolute ethanol were centrifugally washed three times respectively, and finally dried in an oven at 50°C for 36 hours to obtain the modified melamine precursor.

[0033] Step 2, put the precursor obtained in step 1 into an alumina crucible and cover it; heat preservation at 600°C for 2 hours, and calcine at a heating rate of 0.5°C / min to obtain O-doped g-C 3 N 4 powder.

[0034] The O-doped g-C obtained in this example 3 N 4 P...

Embodiment 2

[0036] Step 1, according to the mass ratio of melamine and deionized water is 1:1, and the volume ratio of hydrogen peroxide and deionized water with a mass concentration of 30% is 1:1, add melamine, hydrogen peroxide and deionized water to clean polytetrafluoroethylene Mix in the lining and stir evenly; put the above-mentioned polytetrafluoroethylene lining into the corresponding stainless steel jacket, tighten it, put it in an oven, keep it at 180°C for 36h, and cool it with the furnace, and use the solid-liquid mixture obtained The modified melamine precursor can be obtained by centrifugally washing 6 times with deionized water and absolute ethanol, and finally drying in an oven at 90°C for 12 hours.

[0037] Step 2, put the precursor obtained in step 1 into an alumina crucible and cover it; heat preservation at 550°C for 3 hours, and calcine at a heating rate of 3°C / min to obtain O-doped g-C 3 N 4 powder.

[0038] The O-doped g-C obtained in this example 3 N 4 Powder T...

Embodiment 3

[0040] Step 1, according to the mass ratio of melamine and deionized water is 1:5, and the volume ratio of hydrogen peroxide and deionized water with a mass concentration of 30% is 1:10, add melamine, hydrogen peroxide and deionized water to clean polytetrafluoroethylene Mix in the lining and stir evenly; put the above-mentioned polytetrafluoroethylene lining into the corresponding stainless steel jacket, tighten it, put it in an oven, keep it at 200°C for 24h, and cool it with the furnace, and use the solid-liquid mixture obtained The modified melamine precursor was obtained by centrifugally washing 4 times with ionized water and absolute ethanol, and finally drying in an oven at 70°C for 18 hours.

[0041] Step 2, put the precursor obtained in step 1 into an alumina crucible and cover it; heat preservation at 500°C for 6 hours, and calcine at a heating rate of 10°C / min to obtain O-doped g-C 3 N 4 powder.

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Abstract

The invention discloses a preparation method of O-doped graphite phase carbon nitride nanosheet powder. Melamine, hydrogen peroxide and water are taken as raw materials, and a modified melamine precursor is prepared through hydro-thermal treatment of melamine under assistance of hydrogen peroxide; modified melamine is calcined at the high temperature, and the wide bandgap O-doped g-C3N4 nanosheetpowder can be obtained. Compared with bulk-phase g-C3N4, the O-doped g-C3N4 nanosheet powder has higher specific surface area, besides, O is doped in a g-C3N4 framework to change the electronic structure of conventional bulk-phase g-C3N4, so that the bandgap is notably increased, and defects that the nanosheet powder easily and rapidly composites light-generated electrons and holes and the light quantum efficiency is low are overcome, so that the photocatalytic performance of g-C3N4 is increased. The method has the advantages that the reaction process is simple, the method is easy to control,the cost of used raw materials is low and the method has no special requirements for equipment, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic material preparation, and in particular relates to a preparation method of O-doped graphite phase carbon nitride nanosheet powder. Background technique [0002] Graphite carbon nitride (g-C 3 N 4 ) as a new type of polymer semiconductor photocatalyst has been widely concerned. At present, a large number of studies have shown that: g-C 3 N 4 It has a sheet structure similar to graphene, a suitable energy band structure and good chemical stability, so it can be used in photocatalytic degradation of pollutants, decomposition of water to produce hydrogen and reduction of CO 2 The field has good application prospects. However, traditional bulk g-C 3 N 4 The disadvantages of small specific surface area and easy rapid recombination of photogenerated carriers greatly limit its photocatalytic performance. [0003] g-C 3 N 4 Its physical and chemical properties are closely related to its mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
CPCB01J27/24B01J35/004
Inventor 孙少东梁淑华李佳苟旭峰崔杰杨卿
Owner XIAN UNIV OF TECH
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