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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 high cost and complicated preparation process of lamellar porous carbon nitride, and achieves low cost, good photocatalytic performance, and pore size distribution. uniform effect

Active Publication Date: 2018-10-16
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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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 , with deionized water and absolute ethanol to wash by centrifugation for 6 times; then dry 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 4 Powder T...

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Abstract

The invention discloses a preparation method of lamellar porous carbon nitride. The preparation method is characterized in that: a modified precursor is prepared by taking a carbon-nitrogen precursor,dye and water as raw materials and adopting dye-assisted hydrothermal treatment to treat a conventional carbon-nitrogen precursor; and then the modified precursor is subjected to high-temperature calcination, and the lamellar porous carbon nitride is obtained. The obtained carbon nitride has a distinct two-dimensional lamellar porous structure, and the pore size distribution is uniform, thereby not only effectively increasing a specific surface area of a material and then increasing reactive active sites, but also realizing the regulation of a material band structure and optimizing the reaction potential of photoreduction and photooxidation; and the carbon nitride exhibits good photocatalytic performance compared with the conventional non-porous, easily agglomerated bulk phase g-C3N4. Inaddition, the lamellar porous carbon nitride has the advantages of simple process, wide sources of raw materials, low cost, strong experimental operation and no special requirements on equipment, fully meets the current non-toxic, environmentally-friendly, simple and low-cost industrial-grade demands, 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 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 Applications(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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