Mesoporous C3N4 photocatalytic material prepared by using molten salt method and application thereof in photocatalysis field

A photocatalytic material, C3N4 technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as not easy to promote industrialization, not environmentally friendly, cumbersome process, etc., to achieve easy large-scale The effect of industrialized production and large specific surface area

Inactive Publication Date: 2013-03-27
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process of this method is loaded down with trivial details, is not environmentally friendly, is not easy to promote industrialization

Method used

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  • Mesoporous C3N4 photocatalytic material prepared by using molten salt method and application thereof in photocatalysis field
  • Mesoporous C3N4 photocatalytic material prepared by using molten salt method and application thereof in photocatalysis field
  • Mesoporous C3N4 photocatalytic material prepared by using molten salt method and application thereof in photocatalysis field

Examples

Experimental program
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Effect test

Embodiment 1

[0026] mesoporous C 3 N 4 Preparation: Weigh 1.0g of sodium chloride powder, 1.0g of potassium chloride, 1.0g of lithium chloride and mix with 0.6g of melamine. After the mixed powder is fully ground and mixed evenly, it is placed in a crucible and heat-treated in a muffle furnace at 500°C. 2h, the sintered powder was ultrasonically washed three times with deionized water, centrifuged, and dried at 60°C for 4h to obtain mesoporous C 3 N 4 . XRD analysis showed ( figure 1 ), the prepared C 3 N 4 It is a pure phase product. BET analysis shows that ( figure 2 ), the prepared C 3 N 4 Has a high specific surface area, about 150.4m 2 / g (the mass ratio of molten salt to melamine is 15:1), and the average mesopore size is 3.8nm. Scanning electron microscope observation shows ( image 3 ), the prepared C 3 N 4 It is a semi-coiled tube with a length of micron order. UV-Vis spectrophotometer analysis showed that ( Figure 4 ), the resulting mesoporous C 3 N 4 The ligh...

Embodiment 2

[0028] mesoporous C 3 N 4 Preparation: Weigh 0.1g of sodium chloride powder, 0.8g of potassium chloride, 1.0g of lithium chloride and mix with 0.6g of melamine. After the mixed powder is fully ground and mixed evenly, it is placed in a crucible and heat-treated in a muffle furnace at 450°C. 2h, the sintered powder was ultrasonically washed three times with deionized water, centrifuged, and dried at 60°C for 4h to obtain mesoporous C 3 N 4 .

Embodiment 3

[0030] mesoporous C 3 N 4 Preparation: Weigh 1.0g of sodium chloride powder, 0.6g of potassium chloride, 0.1g of lithium chloride and 0.6g of melamine and mix them. After the mixed powders are thoroughly ground and mixed evenly, they are placed in a crucible and heat-treated in a muffle furnace at 650°C. 2h, the sintered powder was ultrasonically washed three times with deionized water, centrifuged, and dried at 60°C for 4h to obtain mesoporous C 3 N 4 .

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Abstract

The invention discloses a mesoporous C3N4 photocatalytic material prepared by using a molten salt method and a preparing method thereof. The method comprises the following steps that water-soluble low-melting-point molten salt is fully mixed with melamine, small molten salt drops are used as a blocked layer under the melting temperature of the molten salt, C3N4 grows in a way of being coated with the small drops, and the molten salt is recycled by water washing after reaction, so as to obtain the C3N4 photocatalytic material. The C3N4 photocatalytic material is in a wormlike mesoporous structure, the mesoporous size is within 3.8+/-1nm, and the forming mechanism of the mesoporous C3N4 photocatalytic material is that the small molten salt drops are used as the growth blocked layer. When the material is prepared, water-soluble low-melting-point chloride salt is used as the molten salt and is fully mixed with melamine to obtain a mixture, the mixture is subjected to the heat treatment in a muffle furnace for 1-5h under the temperature being 400-680 DEG C to obtain samples, and the samples after the heat treatment are washed by water to recycle the molten salt, so as to obtain the mesoporous C3N4 photocatalytic material. In the whole process, a template is not introduced, and the operation is easy and feasible, so that the large-scale industrial production can be realized easily.

Description

technical field [0001] The invention relates to a mesoporous photocatalytic material and its preparation method and application, in particular to a mesoporous C material prepared by using molten salt droplets as a barrier agent. 3 N 4 Methods and applications of photocatalytic materials. Background technique [0002] In recent years, C 3 N 4 As an emerging important photocatalytic material of organic polymers, it has attracted much attention. It has been experimentally confirmed that C 3 N 4 In the degradation of organic pollutants, water splitting and photocatalytic CO 2 It has a good effect in reduction and has a good application prospect in the field of photocatalysis. [0003] A large number of experimental facts have proved that mesoporous materials usually have high specific surface area and more reactive sites, so they have better photocatalytic activity. However, currently mesoporous C 3 N 4 The preparation of photocatalytic materials mostly uses mesoporous...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/082B01J27/24
Inventor 闫世成高洪林邹志刚
Owner NANJING UNIV
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