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Preparation method of porous g-C3N4 with high specific surface area

A high specific surface area, g-c3n4 technology, used in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc. Product cost, high application prospect and practical value, the effect of simple process

Active Publication Date: 2018-07-13
GUANGXI UNIV FOR NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the preparation of high specific surface area porous g-C 3 N 4 Nanomaterials are based on the template method—hard template method and soft template method. However, most hard template methods use silica spheres as template agents, and NH 4 HF 2 , HF or NaOH and other solutions are removed, which is not conducive to environmental protection; the soft template method needs to add various surfactants, which may introduce more C defects, resulting in a higher recombination probability of photogenerated carriers

Method used

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  • Preparation method of porous g-C3N4 with high specific surface area
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  • Preparation method of porous g-C3N4 with high specific surface area

Examples

Experimental program
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Effect test

Embodiment 1

[0019] (1) Add 0.8g of glycerol and 35g of methanol to a 150ml conical flask in turn, mix well, add 15g of urea, put on a spherical condenser and place it in a water bath heating magnetic stirrer at a constant temperature of 40°C for magnetic stirring After the urea is completely dissolved, continue to stir and reflux at a constant temperature for 15 minutes, then pour the solution into a beaker while it is hot, seal the mouth of the beaker with a plastic wrap, and let the solution stand at room temperature to cool and recrystallize. Two more replicates were prepared in parallel using the same method.

[0020] (2) Collect the above recrystallized urea, wash it with an appropriate amount of absolute ethanol until there is no glycerol residue, and then place the crystal in a blast drying oven at 120°C for blast drying.

[0021] (3) Put the dried urea into more than 2 / 3 of a 30ml capped ceramic crucible, wrap the crucible with tin foil, place it in a muffle furnace at a rate of 1...

Embodiment 2

[0024] (1) Add 2.5g of glycerol and 33.5g of methanol to a 150ml ground-mouth Erlenmeyer flask in sequence. After mixing evenly, add 15g of urea, put on a spherical condenser and place it in a water bath heating magnetic stirrer at a constant temperature of 40°C. Stir and condense and reflux. After the urea is completely dissolved, continue to stir and reflux at a constant temperature for 15 minutes, then pour the solution into a beaker while it is hot, seal the mouth of the beaker with plastic wrap, and let the solution stand at room temperature to cool and recrystallize. Two more replicates were prepared in parallel using the same method.

[0025] (2) Collect the above recrystallized urea, wash and filter with an appropriate amount of absolute ethanol until there is no glycerol residue, and then place the crystals in a blast drying oven at 120°C for blast drying.

[0026] (3) Put the dried urea into more than 2 / 3 of a 30ml capped ceramic crucible, wrap the crucible with tin ...

Embodiment 3

[0029] (1) Add 8g of glycerol and 30g of methanol to a 150ml conical flask in sequence. After mixing evenly, add 20g of urea, cover with a spherical condenser, place in a water bath heating magnetic stirrer at a constant temperature of 40°C for magnetic stirring and Condensation and reflux, after the urea is completely dissolved, continue to stir and reflux at a constant temperature for 15 minutes, then pour the solution into a beaker while it is hot, seal the mouth of the beaker with plastic wrap, and let the solution stand at room temperature to cool and recrystallize. Three more copies were prepared in parallel using the same method.

[0030] (2) Collect the above recrystallized urea, wash and filter with an appropriate amount of absolute ethanol until there is no glycerol residue, and then place the crystals in a blast drying oven at 120°C for blast drying.

[0031] (3) Put the dried urea into more than 2 / 3 of a 30ml capped ceramic crucible, wrap the crucible with tin foil...

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Abstract

The invention relates to a preparation method of porous g-C3N4 with high specific surface area. The preparation method comprises: re-crystallizing urea by using a certain proportion of a methanol-glycerol system, washing the crystal by using anhydrous ethanol, drying, placing the crystal in a covered crucible, calcining for 2 h at a temperature of 400 DEG C in a muffle furnace, and calcining for 2h at a temperature of 550 DEG C to obtain the pale yellow pure g-C3N4. According to the present invention, g-C3N4 with different specific surface areas and different pore volumes can be obtained by adjusting the ratio of the methanol-glycerol to the urea, and the prepared g-C3N4 has the specific surface area of 133.05-210.80 m<2> / g and the pore volume of 0.497-1.537 cm<3> / g; and the method has advantages of simple operation steps, low cost of the raw materials, effectively reduced product cost, high application prospect and high practical value.

Description

technical field [0001] The invention relates to a high specific surface area porous g-C 3 N 4 The invention relates to a method for preparing nanometer materials, which belongs to the technical field of preparation of inorganic functional materials. Background technique [0002] Graphite carbon nitride (g-C 3 N 4 ) has attracted extensive attention as a new type of visible light photocatalytic material. This simple polymer semiconductor consists of nitrogen, carbon and a small amount of hydrogen. Due to the sp of nitrogen and carbon elements 2 Orbital hybridization forms a π-conjugated plane with a bandgap of only 2.7 eV. Moreover, this polymer semiconductor is easy to prepare, and can be directly obtained by thermally polycondensing nitrogen-containing organic precursors such as urea. However, g-C synthesized by direct thermal condensation 3 N 4 The specific surface area and porosity are very low, which restricts its further development. Therefore, many methods ...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/00
CPCB01J27/24B01J37/00B01J35/39
Inventor 马祥英黄在银刘绍刚陈其锋韩妆
Owner GUANGXI UNIV FOR NATITIES
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