Preparation method of graphite type carbon nitride photocatalytic material

A catalytic material, graphite-based technology, used in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as product agglomeration, low specific surface area, and damage to semiconductor characteristics, and achieve visible light catalytic efficiency. High, broad application prospects, the effect of reducing the compound rate

Inactive Publication Date: 2015-04-08
JIANGSU UNIV
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Problems solved by technology

[0002] The problem of environmental pollution has increasingly become a major concern in today's society. In recent years, g-C 3 N 4 As a new type of important organic photocatalytic material, it has attracted wide attention due to the fact that C 3 N 4 Special semiconductor structure (Eg≈2.7eV), good stability, layered structure and easy-to-obtain raw materials are considered to have the potential to catalyze the degradation of organic pollutants; however, a large number of studies have found that high electron-hole recombination rate , low utilization rate of visible light, low specific surface area, low electron transport efficiency and easy agglomeration morphology limit its application in the field of photocatalysis
[0003] Copolymerization of dicyandiamide and barbituric acid, the obtained product has excellent visible light absorption ability, but this experiment only uses a simple heating method, which makes the product appear serious agglomeration phenomenon, w

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  • Preparation method of graphite type carbon nitride photocatalytic material
  • Preparation method of graphite type carbon nitride photocatalytic material
  • Preparation method of graphite type carbon nitride photocatalytic material

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Example Embodiment

[0022] A preparation method of graphite-type carbon nitride photocatalytic material. The preparation method includes the following steps:

[0023] (1) Grind and mix barbituric acid, dimeric cyanamide, lithium chloride and potassium chloride thoroughly.

[0024] (2) Put the mixture in a calcination vessel and calcine in a nitrogen atmosphere.

[0025] (3) Grind the calcined product, sonicate, centrifuge and dry to obtain the g-C 3 N 4 catalyst.

[0026] The molar ratio of barbituric acid to dimeric cyanamide in step (1) is between 0.04 and 0.22; the mass ratio of lithium chloride to potassium chloride is 9:11; the lithium chloride and chlorine The ratio of the total mass of potassium chloride to the mass of dimeric cyanamide is 5:1.

[0027] The calcination process described in step (2) is: heating to 400°C at a rate of 7°C / min, holding for 6 hours, and continuing to heat to 570°C at the same heating rate for 12 hours.

[0028] The ultrasonic time described in step (3) is 1 hour, the...

Example Embodiment

[0031] Example 1: Block g-C 3 N 4 Catalyst preparation

[0032] Take 2g of dimeric cyanamide into the corundum ark, place it in the middle of the tube furnace, heat it to 550°C at a heating rate of 2.5°C / min, and keep it at 550°C for 4 hours. The whole process is carried out under the protection of nitrogen. After being naturally cooled, it was taken out and ground with a mortar to obtain a yellow powder sample.

Example Embodiment

[0033] Example 2: Layered modification g-C 3 N 4 Preparation

[0034] Take 2g of dimeramine, 0.29g of barbituric acid (the molar ratio of barbituric acid to dimeramine is 0.10), 4.5g of lithium chloride, 5.5g of potassium chloride, and grind in a mortar for 20 minutes ; Put the mixture in the middle of the tube furnace, heat it to 400℃ at a heating rate of 7℃ / min, and keep it at 400℃ for 6 hours; continue to heat it to 570℃ at a heating rate of 7℃ / min and keep it at 570℃ After 12 hours, the whole process was carried out under the protection of nitrogen. After natural cooling, the block was taken out, ground for 20 minutes, sonicated for 1 hour, rinsed with boiling water at 100°C for 3 times, and centrifuged at a rate of 10,000 revolutions per minute with a centrifuge. Min, take out the suspension and dry it at 80°C for 2 days to get the final sample.

[0035] The catalysts prepared according to the methods of Examples 1 and 2 were scanned by X-ray diffractometer, see figure 1...

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Abstract

The invention discloses a preparation method of a graphite type carbon nitride photocatalytic material, belonging to the field of the material preparation and photocatalytic technology. The graphite type carbon nitride photocatalytic material takes dicyandiamide and barbituric acid as co-precursors, adopts lithium chloride and potassium chloride as heating mediums, and is prepared in protective atmosphere through directly burning. The prepared g-C3N4 has excellent visible light absorption ability and the laminated structure characteristics, and has the degradation efficiency up to 83.8% to rhodamine B within 90min under visible light. The preparation method is simple, the raw materials are easily available, the visible light catalytic efficiency is high, and the graphite type carbon nitride photocatalytic material has wide application prospect in the photocatalytic field.

Description

technical field [0001] The invention belongs to the field of visible light catalysis, and in particular relates to a preparation method of a graphite-type carbon nitride photocatalytic material and its application in catalytically degrading pollutants in water under visible light. Background technique [0002] The problem of environmental pollution has increasingly become a major concern in today's society. In recent years, g-C 3 N 4 As a new type of important organic photocatalytic material, it has attracted wide attention due to the fact that C 3 N 4 Special semiconductor structure (Eg≈2.7eV), good stability, layered structure and easy-to-obtain raw materials are considered to have the potential to catalyze the degradation of organic pollutants; however, a large number of studies have found that high electron-hole recombination rate , low utilization rate of visible light, low specific surface area, low electron transport efficiency and easy agglomeration morphology lim...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30
Inventor 严学华邹涵任杰缪进进吴肖沙大巍戴煜
Owner JIANGSU UNIV
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