Method for preparing carbon nitride material with nano sheet/nano tube composite structure

A nanotube composite and nanosheet technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of limited photocatalytic performance improvement and single morphology, and achieve improved photocatalytic performance , simple process, and the effect of reducing mass transfer resistance

Inactive Publication Date: 2019-04-19
XIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of nanosheet / nanotube composite structure carbon nitride material, which solves the problem of bulk phase g-C prepared by existing methods. 3 N 4 The problem of single morphology and limited improvement of photocatalytic performance

Method used

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  • Method for preparing carbon nitride material with nano sheet/nano tube composite structure
  • Method for preparing carbon nitride material with nano sheet/nano tube composite structure

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Embodiment 1

[0032] Step 1, according to the mass ratio of melamine and deionized water is 1:10, the mass ratio of potassium fluoride and deionized water is 1:50, add melamine, potassium fluoride and deionized water into clean polytetrafluoroethylene Mix in the lining and stir evenly; cover the above-mentioned polytetrafluoroethylene lining with a lid, put it into the corresponding stainless steel jacket, tighten it, put it in an oven, and keep it warm at 200 ° C for 12 hours; after cooling with the furnace, the obtained solid-liquid mixture , with deionized water and absolute ethanol to wash five times by centrifugation; then dry in an oven at 70°C for 20 hours to obtain a white modified melamine precursor.

[0033] Step 2, put the precursor obtained in step 1 into an alumina crucible, and cover it; heat preservation at 550°C for 3.5h, calcining at a heating rate of 0.5°C / min, to obtain a nanosheet / nanotube composite structure of carbon nitride materials.

[0034] The g-C that embodiment...

Embodiment 2

[0036] Step 1, according to the mass ratio of melamine and deionized water is 1:10, and the mass ratio of potassium bromide and deionized water is 1:50, add melamine, potassium bromide and deionized water into clean polytetrafluoroethylene Mix in the lining and stir evenly; cover the above-mentioned polytetrafluoroethylene lining with a lid, put it into the corresponding stainless steel jacket, tighten it, put it in an oven, and keep it warm at 200 ° C for 12 hours; after cooling with the furnace, the obtained solid-liquid mixture , respectively centrifuged and washed 6 times with deionized water and absolute ethanol; then dried in an oven at 60° C. for 24 hours to obtain a white modified melamine precursor.

[0037] Step 2, put the precursor obtained in step 1 into an alumina crucible, and cover it; heat preservation at 550°C for 3.5h, calcining at a heating rate of 0.5°C / min, to obtain a nanosheet / nanotube composite structure of carbon nitride materials.

[0038] The g-C th...

Embodiment 3

[0040]Step 1, according to the mass ratio of melamine and deionized water is 1:100, and the mass ratio of potassium fluoride and deionized water is 10:1, add melamine, potassium fluoride and deionized water into clean polytetrafluoroethylene Mix in the lining and stir evenly; cover the above-mentioned polytetrafluoroethylene lining with a lid, put it into the corresponding stainless steel jacket, tighten it, put it in an oven, and keep it warm at 220 ° C for 8 hours; after cooling with the furnace, the obtained solid-liquid mixture , were centrifuged and washed 8 times with deionized water and absolute ethanol respectively; then dried in an oven at 65°C for 30 hours to obtain a white modified melamine precursor.

[0041] Step 2. Put the precursor obtained in step 1 into an alumina crucible and cover it; heat preservation at 450°C for 6 hours, and calcining at a heating rate of 0.1°C / min to obtain a nanosheet / nanotube composite structure carbon nitride material.

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Abstract

The invention discloses a method for preparing a carbon nitride material with a nano-sheet/nano-tube composite structure, which comprises the following steps of: preparing a modified precursor by taking a carbon-nitrogen precursor, a halogen potassium compound and water as raw materials and carrying out hydrothermal treatment on a conventional carbon-nitrogen precursor by adopting the halogen potassium compound; then calcining the modified precursor at high temperature to obtain the carbon nitride material with the nano-sheet/nano-tube composite structure. Compared with the traditional bulk phase g-C3N4, on one hand, the carbon nitride material prepared by the method has the obvious nano-sheet/nano-tube composite structure, so that the specific surface area of the material is effectively improved, and the photocatalytic activity of the carbon nitride material is improved; on the other hand, a hollow tubular structure is beneficial to promoting multiple scattering of visible light inside, effectively promoting the separation and conduction of photon-generated carriers, improving the utilization rate of the material to light, and further improving the photocatalytic performance. Compared with unmodified bulk phase g-C3N4, the degradation rate of the material of the invention is improved by 30 times.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic material preparation, and in particular relates to a preparation method of a carbon nitride material with a nanosheet / nanotube composite structure. Background technique [0002] Graphite carbon nitride (g-C 3 N 4 ) as a visible light-responsive non-metallic polymer semiconductor material has broad application prospects in the fields of photolysis of water to produce hydrogen, photoreduction of carbon dioxide, and photodegradation of organic pollutants. However, unmodified bulk g-C 3 N 4 Although it has a certain photocatalytic performance, it has the disadvantages of small specific surface area, fast recombination rate of photogenerated carriers, and low photocatalytic activity under visible light, which seriously restricts its application in the field of photocatalysis. [0003] Existing literature shows that: conventional bulk g-C 3 N 4 The modification methods of photocatalytic mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/02
CPCB01J27/24B01J35/004B01J35/023
Inventor 孙少东宋鹏梁淑华崔杰杨卿
Owner XIAN UNIV OF TECH
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