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Preparation method of fiber-shaped carbon nitride

A technology of carbon nitride and carbon nitride, which is applied in the field of photocatalytic material preparation, can solve the problems of small specific surface area, fast electron-hole recombination, easy agglomeration, etc., achieve good dispersion, strong experimental operability, overcome easy reunion effect

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 this invention is to provide a kind of preparation method of fibrous carbon nitride, which solves the problem of existing g-C 3 N 4 The specific surface area is small, the electron-hole recombination is too fast, and the problem of easy agglomeration

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  • Preparation method of fiber-shaped carbon nitride
  • Preparation method of fiber-shaped carbon nitride

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preparation example Construction

[0026] The preparation method of a fibrous carbon nitride of the present invention comprises the steps of directly calcining the nitrogen-carbon precursor to obtain bulk carbon nitride, and then mixing the bulk carbon nitride with a saturated solution of soluble salt, stirring and heating until evaporated to dryness, and obtaining A solid mixture of soluble salt and carbon nitride powder. Finally, the obtained solid mixture is calcined, washed and dried to obtain fibrous carbon nitride.

[0027] Specifically follow the steps below:

[0028] Step 1, preparation of bulk carbon nitride:

[0029] Weigh a certain amount of carbon-nitrogen precursor dipolycyanamide into a corundum crucible, calcinate in a muffle furnace at 550°C-650°C for 1-3 hours, and heat up at a rate of 0.1-2°C / min to obtain bulk carbon nitride. Grinding with a mortar to obtain carbon nitride powder with uniform size distribution;

[0030] Step 2, preparation of bulk carbon nitride and soluble salt solid mixtu...

Embodiment 1

[0037] Step 1, preparation of bulk carbon nitride

[0038] Weigh 15g of dipolycyanamide into a corundum crucible, calcinate in a muffle furnace at 550°C for 2h, and the heating rate is 0.5°C / min to obtain bulk phase carbon nitride; then grind it with a mortar to obtain nitrogen with uniform size distribution. Carbonized powder;

[0039] Step 2, preparation of bulk carbon nitride and soluble salt solid mixture:

[0040] Mix the carbon nitride powder obtained in step 1 and the saturated sodium chloride solution uniformly at a mass volume ratio of 0.1 g / mL; then stir at 750 r / min on a digital temperature-controlled magnetic stirrer, and heat at 150°C until evaporated to dryness , and then dried in an oven at 50°C for 24 hours to obtain a solid mixture of sodium chloride and carbon nitride powder;

[0041] Step 3, preparation of fibrous carbon nitride:

[0042] After grinding the solid mixture of the soluble salt and carbon nitride powder obtained in step 2, weigh 5g and put it...

Embodiment 2

[0045] Step 1, preparation of bulk carbon nitride

[0046] Weigh 20g of dicyandiamide into a corundum crucible, calcinate in a muffle furnace at 600°C for 2h, and the heating rate is 1°C / min to obtain bulk phase carbon nitride; then grind it with a mortar to obtain nitrogen with uniform size distribution. Carbonized powder;

[0047] Step 2, preparation of bulk carbon nitride and soluble salt solid mixture:

[0048]Mix the carbon nitride powder obtained in step 1 and saturated potassium bromide solution uniformly at a mass volume ratio of 0.2 g / mL; then stir at 500 r / min on a digital display temperature-controlled magnetic stirrer, and heat at 100°C until evaporated to dryness , and then dried in an oven at 50°C for 10 hours to obtain a solid mixture of potassium bromide and carbon nitride powder;

[0049] Step 3, preparation of fibrous carbon nitride:

[0050] Grind the solid mixture of potassium bromide and carbon nitride powder obtained in step 2 evenly, weigh 3g, put it ...

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Abstract

The invention discloses a preparation method of fiber-shaped carbon nitride. By directly roasting a nitrogen-carbon precursor, bulk phase carbon nitride is obtained, then bulk phase carbon nitride ismixed with a saturated solution of soluble salt, stirring and heating are conducted until evaporation to dryness is achieved, a solid mixture of soluble salt and carbon nitride powder is obtained, andfinally the obtained solid mixture is roasted, cleaned and dried to obtain fiber-shaped carbon nitride. The prepared fiber-shaped carbon nitride has an obvious nano size effect, the specific surfacearea of the material can be effectively increased, the reaction active site is added, and the photocatalytic performance of the material is improved; fiber-shaped carbon nitride is even in size, goodin dispersity and smooth in surface, has hydrophobicity and low density, and can be evenly dispersed into a dye solution, the defect is overcome that bulk phase carbon nitride is easily gathered in the traditional degradation process, and it is guaranteed that the photocatalytic process is stably and efficiently conducted.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic material preparation, and in particular relates to a preparation method of fibrous carbon nitride. Background technique [0002] In recent years, with the continuous advancement of my country's industrialization and urbanization process and the rapid development of social economy, environmental pollution and energy shortage have become two major problems facing the world today. Using photocatalysts to convert inexhaustible solar energy into energy that can be directly used by humans, and to completely mineralize and degrade various organic and inorganic pollutants is a current research direction for renewable and clean energy. [0003] Among numerous photocatalysts, the graphitic phase carbon nitride g-C with unique structure 3 N 4 Due to its good photocatalytic performance, it has great application prospects in the fields of photolysis of water to produce hydrogen, photoreduction of carb...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/06
CPCB01J27/24B01J35/39B01J35/58
Inventor 孙少东宋鹏梁淑华崔杰杨卿
Owner XIAN UNIV OF TECH
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