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A kind of preparation method of lamellar porous carbon nitride

A porous carbon nitride and lamellar technology, which is applied in the field of photocatalytic material preparation, can solve the problems of complex preparation process and high cost of lamellar porous carbon nitride, achieve good photocatalytic performance, low cost, and increase specific surface area Effect

Active Publication Date: 2021-11-16
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 lamellar porous carbon nitride, which solves the problems of complex preparation process and high cost of the existing lamellar porous carbon nitride

Method used

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  • A kind of preparation method of lamellar porous carbon nitride
  • A kind of preparation method of lamellar porous carbon nitride

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preparation example Construction

[0023] The invention relates to a preparation method of lamellar porous carbon nitride, which uses carbon and nitrogen precursors, dyes and water as raw materials, first adopts dye-assisted hydrothermal treatment of conventional carbon and nitrogen precursors to prepare modified precursors; then the above modified The lamellar porous carbon nitride can be obtained by calcining the precursor at high temperature.

[0024] Specifically follow the steps below:

[0025] Step 1, preparation of modified precursor:

[0026] Weigh the carbon-nitrogen precursor, put it into a clean polytetrafluoroethylene lining, and then add dye and deionized water; the mass ratio of carbon-nitrogen precursor to deionized water is 1:2 to 1:50, and the dye The mass ratio to deionized water is 1:100~1:500000. After stirring evenly, cover the lid and move it into the corresponding stainless steel reactor jacket, and keep it in an oven at 110~210°C for 10~100h. After cooling in the furnace, the obtained ...

Embodiment 1

[0033] Step 1, according to the mass ratio of melamine and deionized water is 1:10, and the mass ratio of rhodamine B and deionized water is 1:6000, add melamine, rhodamine B, 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, respectively, centrifuged and washed 5 times; then dried in an oven at 70 ° C for 20 h, and the light pink modified melamine precursor can be obtained.

[0034] Step 2. Put the precursor obtained in step 1 into an alumina crucible and cover it; heat preservation at 550°C for 4 hours, and calcining at a heating rate of 0.5°C / min to obtain light yellow lamellar porous nitrogen carbonized.

[0035] The g-C that embod...

Embodiment 2

[0037] Step 1, according to the mass ratio of melamine and deionized water is 1:10, and the mass ratio of methyl orange and deionized water is 1:2000, add melamine, methyl orange 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 brown modified melamine precursor.

[0038] Step 2, put the precursor obtained in step 1 into an alumina crucible, and cover it; heat preservation at 550°C for 4 hours, and calcining at a heating rate of 0.5°C / min to obtain brown lamellar porous nitriding carbon.

[0039] The g-C that embodiment 2 obtains 3 N ...

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Abstract

The invention discloses a preparation method of lamellar porous carbon nitride, which uses carbon and nitrogen precursors, dyes and water as raw materials, and adopts dye-assisted hydrothermal treatment of conventional carbon and nitrogen precursors to prepare modified precursors; then the above modified Precursors are calcined at high temperature to obtain lamellar porous carbon nitride. The obtained carbon nitride has an obvious two-dimensional lamellar porous structure with uniform pore size distribution, which not only effectively increases the specific surface area of ​​the material and thus increases the reactive sites, but also realizes the regulation of the energy band structure of the material and optimizes the optical efficiency. Reaction potentials for reduction and photooxidation, compared with conventional nonporous, agglomerated bulk g‑C 3 N 4 exhibited good photocatalytic performance. In addition, the present invention has the advantages of simple procedures, wide sources of raw materials, low cost, strong experimental operability, and no special requirements for equipment, which fully meets the current industrial-grade requirements of non-toxic, environmentally friendly, simple, and low-cost, and is suitable for large-scale industrialization 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 lamellar porous carbon nitride. Background technique [0002] Graphite carbon nitride (g-C 3 N 4 ), as a two-dimensional semiconductor material with a graphene-like structure, has great application prospects in the fields of photolysis of water to produce hydrogen, photoreduction of carbon dioxide, and photodegradation of organic pollutants. Regular bulk g-C 3 N 4 Although it has certain photocatalytic properties, its application in the field of photocatalysis is severely restricted due to its defects in energy band structure, small specific surface area, and easy agglomeration. [0003] Existing literature shows that both "morphology control" and "doping" are effective ways to improve the physical and chemical properties of a single material, and can optimize the performance of the material. Among them, the "do...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/082
CPCC01B21/0605C01P2004/04
Inventor 孙少东宋鹏梁淑华苟旭丰崔杰
Owner XIAN UNIV OF TECH
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