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Preparation method of element-doped porous g-C3N4 nano-sheets

An element doping, g-c3n4 technology, applied in the field of photocatalytic materials, can solve the problems of high exciton binding energy, easy recombination, low specific surface area, etc., to achieve strong light absorption ability, low preparation cost, high specific surface area. Effect

Active Publication Date: 2018-11-23
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the inventors found that the g-C obtained by thermal condensation polymerization of nitrogen-containing precursors 3 N 4 The specific surface area is low, the exciton binding energy of the photogenerated carriers is high, and the photogenerated electron holes are easy to recombine, resulting in low photocatalytic efficiency.

Method used

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Embodiment 1

[0024] Please refer to figure 1 , an embodiment of the present invention provides an element-doped porous g-C 3 N 4 The preparation method of nano sheet, comprises the following steps:

[0025] (1) Take the template agent and the precursor in proportion and dissolve them in water, then freeze-dry to obtain a uniform mixture; the mass ratio of the template agent to the precursor is 2 to 40:1, the template agent uses sodium chloride, and the precursor It is dicyandiamide; the freeze-drying temperature is -15~-30°C; during the freezing process, sodium chloride and dicyandiamide are precipitated in the form of crystals, and the two can be mixed evenly. The template agent sodium chloride is a mineral rock salt. The main component is rich in reserves, easy to obtain, and low in cost, which is conducive to industrial production;

[0026] (2) Place the obtained mixture in a muffle furnace to heat up and calcinate to obtain the template @g-C 3 N 4 Mixture; the heating rate is 5-15...

Embodiment 2

[0035] Preparation of sodium-doped porous g-C according to the method of Example 1 of the present invention 3 N 4 Nanosheets, comprising the steps of:

[0036] (1) 2g of sodium chloride and 1g of dicyandiamide were co-dissolved in 150mL of deionized water, and then the solution was freeze-dried to obtain a homogeneous mixture of sodium chloride and dicyandiamide;

[0037] (2) Put the homogeneous mixture of sodium chloride and dicyandiamide in a muffle furnace for calcination at 550°C for 4 hours, the heating rate is 2.3°C / min, take it out after natural cooling, and obtain sodium chloride@g-C 3 N 4 mixture;

[0038] (3) The obtained sodium chloride@g-C 3 N 4 The mixture was placed in 150 mL of deionized water and stirred at room temperature for 10 h, then suction filtered until the conductivity of the filtrate dropped below 10, and the obtained pale yellow solid was freeze-dried to obtain porous g-C with sodium doping. 3 N 4 Nanosheet; its visible light catalytic water s...

Embodiment 3

[0041] Preparation of sodium-doped porous g-C according to the method of Example 1 of the present invention 3 N 4 Nanosheets, comprising the steps of:

[0042] (1) 10g of sodium chloride and 1g of dicyandiamide were co-dissolved in 150mL of deionized water, and then the solution was freeze-dried to obtain a homogeneous mixture of sodium chloride and dicyandiamide;

[0043] (2) High-temperature calcination: put the uniform mixture of sodium chloride and dicyandiamide in a muffle furnace for calcination at 550°C for 4 hours, the heating rate is 2.3°C / min, take it out after natural cooling, and obtain sodium chloride@g-C 3 N 4 mixture;

[0044] (3) The obtained sodium chloride@g-C 3 N 4 The mixture was placed in 150 mL of deionized water and stirred at room temperature for 10 h, then suction filtered until the conductivity of the filtrate dropped below 10, and the obtained pale yellow solid was freeze-dried to obtain porous g-C with sodium doping. 3 N 4 Nanosheets; its vis...

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Abstract

The invention discloses a preparation method of element-doped porous g-C3N4 nano-sheets and relates to a green and environment-friendly preparation technology of sodium-doped porous graphite-phase carbon nitride (g-C3N4) nano-sheets. The preparation method comprises the following steps: after co-dissolving a template agent sodium chloride and a precursor dicyandiamide, freezing and drying; puttinga dried uniform mixture into a muffle furnace and carrying out high-temperature calcination under an air condition; putting a calcined sodium chloride@g-C3N4 mixture into de-ionized water and dissolving the sodium chloride; separating a sodium chloride template and the g-C3N4 by adopting a suction filtration manner; freezing and drying a light yellow solid substance obtained by suction filtrationto obtain the sodium-doped porous g-C3N4 nano-sheets; adding the dicyandiamide into filtrate again to prepare the sodium-doped porous g-C3N4 nano-sheets, so as to realize repeated utilization of thesodium chloride. The preparation method is simple and the cost of raw materials is low; the obtained sodium-doped porous g-C3N4 nano-sheets have the advantages of large specific surface area, strong light absorption capability and high photo-catalytic efficiency.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, in particular to a porous g-C with element doping 3 N 4 A green and environmentally friendly preparation method for nanosheets. Background technique [0002] Hydrogen energy is a kind of clean energy, and there are many ways to prepare hydrogen, such as steam methane reforming, coal gasification and water splitting or water splitting driven by sunlight. Photocatalyst, graphitic carbon nitride (g-C 3 N 4 ) is a stable photocatalyst without metal components, which is widely used in the field of hydrogen production by photolysis of water. In the related art, g-C 3 N 4 The preparation of cyanide is mainly obtained by thermal condensation polymerization of nitrogen-containing precursors such as cyanamide, dicyandiamide, melamine, urea or thiourea. [0003] However, the inventors found that the g-C obtained by thermal condensation polymerization of nitrogen-containing precursors...

Claims

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Application Information

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IPC IPC(8): B01J27/24
CPCB01J27/24B01J35/39
Inventor 舒杼王文斌周俊
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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