Preparation method and application of highly crystalline carbon nitride photocatalytic material

A carbon nitride photocatalytic material technology, applied in chemical instruments and methods, physical/chemical process catalysts, inorganic chemistry, etc., can solve problems such as CCN crystallinity is not ideal, achieve enhanced photocatalytic hydrogen production activity, increase electronic Delocalized, effects suitable for mass production

Inactive Publication Date: 2019-08-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Description
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  • Application Information

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Problems solved by technology

However, the strength of the (002) plane of CCN prepared by the molten salt method is always lower than that of pseudocrystalline carbon nitride, indicating that the crystallinity of CCN is not ideal.

Method used

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  • Preparation method and application of highly crystalline carbon nitride photocatalytic material
  • Preparation method and application of highly crystalline carbon nitride photocatalytic material
  • Preparation method and application of highly crystalline carbon nitride photocatalytic material

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preparation example Construction

[0027] A preparation method of a highly crystalline carbon nitride photocatalytic material, specifically comprising the following steps:

[0028] Step 1. Preparation of the heptazine precursor: Weigh a certain amount of melamine in a semi-closed crucible and place it in a muffle furnace for calcination. After the calcination, cool naturally to room temperature to obtain the heptazine precursor;

[0029] Step 2, preparation of crystallized carbon nitride: Grind the heptazine precursor, potassium chloride and lithium chloride obtained in step 1 in a mortar, mix evenly, transfer the obtained mixture into a semi-closed crucible, and place Carry out calcination in a muffle furnace, after calcination, naturally cool to room temperature; the obtained product is washed with hot water and ethanol, dried to obtain crystallized carbon nitride; wherein, the mass ratio of heptazine precursor, potassium salt and lithium salt It is 1: (3~10): (3~10);

[0030] Step 3. Preparation of highly c...

Embodiment 1

[0043] A method for preparing a highly crystalline carbon nitride photocatalytic material, comprising the steps of:

[0044](1) Preparation of the heptazine precursor: Weigh 5 g of melamine in a semi-closed crucible and place it in a muffle furnace for calcination at 500° C. for 4 hours. After the calcination, cool naturally to room temperature to obtain the heptazine precursor;

[0045] (2) Preparation of crystallized carbon nitride: first, weigh 0.6g of the heptazine precursor prepared in step (1), 3.3g of potassium chloride and 2.7g of lithium chloride and grind and mix them uniformly in a mortar; then Transfer the mixture into a semi-closed crucible, and place it in a muffle furnace for calcination at 550°C for 4 hours. After the calcination, it is naturally cooled to room temperature and taken out; the obtained product is washed with hot water at 85°C and ethanol in sequence, and dried to obtain The crystallized carbon nitride;

[0046] (3) Preparation of highly crystall...

Embodiment 2

[0048] Compared with Example 1, this example differs in that: the concentration of the aqueous hydrochloric acid solution in step (3) is 0.01mol / L; the rest of the steps are the same as Example 1.

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Abstract

The invention discloses a preparation method and an application of a highly crystallized carbon nitride photocatalytic material, and belongs to the technical field of semiconductor photocatalytic materials. The method comprises the following steps: 1) calcining melamine in a muffle furnace to obtain a heptazine precursor; 2) grinding and uniformly mixing the heptazine precursor, potassium salt andlithium salt, and calcining the mixture in the muffle furnace; 3) taking out the calcined product, and cleaning and drying the calcined product to obtain crystallized carbon nitride; and 4) dispersing the obtained crystallized carbon nitride in hydrochloric acid, continuously stirring the system, and finally washing and drying the system to obtain the highly crystallized carbon nitride photocatalytic material. In the invention, the crystallized carbon nitride is treated in the hydrochloric acid aqueous solution, so that the crystallinity of the obtained carbon nitride is greatly enhanced. Thehigh-crystallinity carbon nitride has great advantages in the aspects of photo-generated carrier migration and photo-generated electron hole pair inhibition. Meanwhile, potassium ions embedded into the high-crystallization carbon nitride middle layer make great contribution to migration of photo-induced electrons. Based on the two characteristics, the photocatalytic hydrogen production activity of the high-crystalline carbon nitride is greatly enhanced.

Description

technical field [0001] The invention belongs to the technical field of semiconductor photocatalytic materials, and in particular relates to a preparation method and application of a highly crystalline carbon nitride photocatalytic material capable of enhancing photocatalytic hydrogen production activity. Background technique [0002] With the rapid development of the country, environmental issues and energy issues have become two major problems that need to be solved urgently. Due to the high energy density and zero pollution characteristics of hydrogen, it is considered to be an ideal way to solve these two problems. As solar energy is an inexhaustible and inexhaustible clean energy, how to use solar energy efficiently and economically to solve environmental problems has become the goal of researchers. The development of photocatalytic materials, as the link to convert solar energy into hydrogen energy, has attracted extensive attention of researchers. [0003] Since 2009...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01B3/04
CPCB01J27/24B01J35/004C01B3/042C01B2203/0277Y02E60/36
Inventor 向全军李阳张岱南廖宇龙张怀武李颉金立川
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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