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a scaly g-c 3 no 4 Nanosheet and its preparation method

A technology of g-c3n4 and nanosheets, which is applied in the fields of chemical instruments and methods, chemical/physical processes, hydrogen/synthesis gas production, etc., can solve the problems of amorphous shape, difficult shape control, and limited photocatalytic performance, and achieve high Effect of crystallinity, expansion of light absorption range, and reduction of recombination probability

Active Publication Date: 2022-03-29
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the use of doping with alkaline metal ions is a popular research direction at present. The traditional preparation method is mostly to mix one or two salts with urea or dicyandiamide and then calcined to obtain a modified photocatalyst. The appearance is often not easy to control and is still in an amorphous state, and the improvement of its photocatalytic performance is also limited.

Method used

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  • a scaly g-c <sub>3</sub> no <sub>4</sub> Nanosheet and its preparation method
  • a scaly g-c <sub>3</sub> no <sub>4</sub> Nanosheet and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A scaly g-C 3 N 4 A method for preparing nanosheets, comprising the following steps:

[0024] (1) Melamine is mixed with three kinds of salts by 1:1 mass ratio (wherein, three kinds of salts are BaCl 2 , KCl and NaCl are mixed in a mass ratio of 5:3:2), mixed and poured into a beaker containing distilled water, then stirred and evaporated to dryness (wherein, the stirring time is 1 to 10 hours, preferably 5 hours, evaporated to dryness The temperature is 60-90°C, preferably 80°C);

[0025] (2) Put the evaporated mixture in a box furnace, heat it to 565°C, and keep it warm for 4 hours to prepare g-C with scaly characteristics 3 N 4 Nanosheets.

[0026] After testing, g-C prepared according to the above steps 3 N 4 Nanosheets, under visible light irradiation, photocatalyzed water splitting hydrogen at a rate of 25616 μmol h -1 g -1 , which is about 34.5 times that of the photocatalytic hydrogen evolution performance of the coarse powder calcined from the nitrogen...

Embodiment 2

[0028] The preparation method of this embodiment is the same as that of Example 1, except that the heating temperature in step (2) is 580°C.

[0029] The sample obtained in this embodiment, g-C 3 N 4 The surface of the nanosheets is evenly distributed, there is no amorphous agglomeration phenomenon, and it has a unique microscopic morphology. After testing, the g-C prepared according to the above steps 3 N 4 Nanosheets, under visible light irradiation, photocatalyzed water splitting hydrogen at a rate of 28036 μmol h -1 g -1 , which is about 37.8 times that of the photocatalytic hydrogen evolution performance of the coarse powder calcined from the nitrogen-containing organic raw material without adding the three kinds of salts.

Embodiment 3

[0031] The preparation method of this example is the same as Example 1, except that the heating temperature in step (2) is 600°C.

[0032] The sample obtained in this embodiment, g-C 3 N 4 The surface of the nanosheets is evenly distributed, there is no amorphous agglomeration phenomenon, and it has a unique microscopic morphology. After testing, the g-C prepared according to the above steps 3 N 4 Nanosheets, under visible light irradiation, photocatalyzed water splitting hydrogen at a rate of 25730 μmol h -1 g -1 , which is about 34.6 times that of the photocatalytic hydrogen evolution performance of the coarse powder calcined from the nitrogen-containing organic raw material without adding the three kinds of salts.

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Abstract

The invention relates to the technical field of nanomaterials, photocatalysis, and water splitting and desorption hydrogen detection, in particular to a scale-like g-C 3 N 4 Nanosheet and preparation method thereof, scaly g-C of the present invention 3 N 4 g‑C in nanosheets 3 N 4 Nanosheets are small and regular scale-like structures, and the g-C 3 N 4 Nanosheet size is 50~600nm, g‑C 3 N 4 The thickness of the nano sheet is 5-30nm. Scaly g-C of the present invention 3 N 4 The nanosheets are prepared by calcining after mixing three kinds of salts and nitrogen-containing organic raw materials. g-C of the present invention 3 N 4 Nanosheets have a unique scale-like structure, have higher crystallinity, and can effectively expand the range of light absorption, reduce the recombination probability of photogenerated electron-hole pairs, and improve their photocatalytic activity and water splitting hydrogen desorption performance. The invention can be effectively applied to the technical field of photocatalytic water splitting and decomposing hydrogen.

Description

technical field [0001] The invention relates to the technical field of nanomaterials and photocatalytic water splitting detection, in particular to a scaly g-C 3 N 4 Nanosheets and methods for their preparation. Background technique [0002] With the deepening of industrialization and urbanization, the fossil energy on the earth is gradually being exhausted. At the same time, it has also caused serious environmental problems and irreversible damage to the ecological balance. Therefore, gradually phase out the production methods that use non-renewable fossil energy as raw materials, and seek a high-efficiency, energy-saving and environmentally friendly energy as an alternative has become a research focus for current researchers. At present, photocatalysis and photocatalytic water splitting hydrogen desorption technology are favored by many researchers, g-C 3 N 4 Nanomaterials have good development prospects in photocatalysis and photocatalytic water splitting and hydrogen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/02C01B3/04B01J35/00
CPCB01J27/24C01B3/042C01B2203/0277B01J35/40B01J35/39Y02E60/36
Inventor 徐光青王志伟刘帮吕珺汪冬梅吴玉程
Owner HEFEI UNIV OF TECH
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