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Preparation method of iron-based supramolecular graphite phase carbon nitride photocatalyst

A phase carbon nitride photo, supramolecular technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc. It can effectively anchor and disperse, improve the catalytic effect, and reduce the leaching effect.

Active Publication Date: 2021-06-25
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pyrolysis of melamine produces g-C 3 N 4 The temperature of melamine is above 350°C, while the melting point of melamine is around 250°C, so when melamine is transformed into g-C 3 N 4 The existence of a molten state during the process not only makes the prepared g-C 3 N 4 Most of them are dense bulk materials with a very low specific surface area, which reduces the active sites and makes the dispersion of iron species insufficient, which affects the separation efficiency of photogenerated electrons.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The catalyst used in the following examples was prepared by the following method:

[0027] Dissolve equimolar amounts of melamine and cyanuric acid in deionized water, respectively, with a molar concentration of 0.25 mol / L. After mixing, stir mechanically for 30 minutes at a speed of 200 rpm / s. Weigh a certain mass of FeCl 3 ·6H 2 O was added to the above solution and stirred in a 70° constant temperature water bath for 0.5h, wherein FeCl 3 ·6H 2 The quality of O is 10% of the total mass of melamine and cyanuric acid. Next, the mixed solution was stirred in a water bath until the water was completely evaporated to dryness, the obtained solid was fully ground and put into a ceramic ark, wrapped with tin foil and placed in a tube furnace, heated to 500° at a rate of 3° / min for calcination for 5 hours under a nitrogen atmosphere. Pass N before calcination 2 30min to exhaust the air present in the tube furnace. Use a mass flow meter to control the gas velocity to 0.15...

Embodiment 2

[0030] Dissolve equimolar amounts of melamine and cyanuric acid in deionized water, respectively, with a molar concentration of 0.4 mol / L, and mix mechanically for 1 hour at a speed of 300 rpm / s. Weigh a certain mass of FeCl 3 ·6H 2 O was added to the above solution and stirred in a constant temperature water bath at 80° for 1 h. Among them, FeCl 3 ·6H 2 The quality of O is 20% of the total mass of melamine and cyanuric acid. Next, the mixed solution was stirred in a water bath until the water was completely evaporated to dryness, the obtained solid was fully ground and put into a ceramic ark, wrapped with tin foil and placed in a tube furnace, and the temperature was raised to 550° at a rate of 4° / min for calcination for 6 hours under a nitrogen atmosphere. Pass N before calcination 2 30min to exhaust the air present in the tube furnace. Use a mass flow meter to control the gas velocity to 0.2 L / min. After naturally cooling to room temperature, the material was taken o...

Embodiment 3

[0033] Dissolve equimolar amounts of melamine and cyanuric acid in deionized water, respectively, with a molar concentration of 0.35 mol / L, and mix mechanically for 45 minutes at a speed of 250 rpm / s. Weigh a certain mass of Fe(NO 3 ) 3 9H 2 O was added to the above solution and stirred in a 75 ° constant temperature water bath for 45 min. Among them, Fe(NO 3 ) 3 9H 2 The dosage of O is 15% of the total mass of melamine and cyanuric acid. Next, stir the mixed solution in a water bath at 120°C until the water is completely evaporated to dryness. The obtained solid is fully ground and put into a ceramic ark, wrapped in tin foil and placed in a tube furnace, heated to 600° at a rate of 5° / min under a nitrogen atmosphere for calcination. 4h. Pass N before calcination 2 30min to exhaust the air present in the tube furnace. Use a mass flow meter to control the gas velocity to 0.10 L / min. After naturally cooling to room temperature, the material was taken out and ground into ...

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Abstract

The invention belongs to the technical field of material preparation and photocatalysis, and relates to a preparation method of an iron-based supramolecular graphite phase carbon nitride photocatalyst. The catalyst is prepared by pyrolyzing a precursor generated from melamine, cyanuric acid and ferric salt through a supramolecular self-assembly reaction. On one hand, the supermolecular graphite phase carbon nitride obtained by the self-assembly method is larger in specific surface area and more in catalytic active sites; and on the other hand, due to the action of hydrogen bonds, the iron-based supramolecular graphite phase carbon nitride is more stable in the preparation process, iron elements can be anchored and dispersed more efficiently, and the separation degree of photo-generated electron holes is improved. The iron-based supramolecular graphite phase carbon nitride has excellent photocatalytic activity, is simple to prepare and low in cost, and has huge environmental and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of material preparation and photocatalysis, and relates to a method for preparing an iron-based supramolecular graphite phase carbon nitride photocatalyst. Background technique [0002] China is a big dye production country, and the pollution of dye wastewater is particularly serious. If it is not dealt with, it will undoubtedly cause serious threats to the environment. However, dye wastewater has high toxicity and large chroma, and is a kind of difficult-to-treat wastewater in industrial wastewater. At present, the traditional treatment methods of dye wastewater are difficult to completely degrade dye wastewater. For example, the adsorption method simply absorbs and transfers the dye in the water instead of degrading or mineralizing it. Treatment of dye wastewater. Compared with the traditional treatment method, the advanced oxidation technology treatment method has the advantages of simple operation, fa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/08C02F1/30
CPCB01J27/24B01J37/082C02F1/30C02F2305/10C02F2101/308B01J35/39Y02W10/37
Inventor 刘志英徐炎华任斌张潇李溪倪凤
Owner NANJING TECH UNIV
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