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

A photocatalytic material, C3N4 technology, applied in the field of preparation of mesoporous C3N4 photocatalytic materials, can solve problems such as not easy to be industrialized, not environmentally friendly, cumbersome process, etc., and achieve the effect of easy large-scale industrial production and large specific surface area

Inactive Publication Date: 2014-07-16
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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
Comparison scheme
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 0.6g of melamine, mix the mixed powders thoroughly and mix them evenly, place them in a crucible, and heat-treat at 500°C in a muffle furnace 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 shows ( figure 1 ), the prepared C 3 N 4 It is a pure phase product. BET analysis shows ( 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), the average mesopore size is 3.8nm. Scanning electron microscope observation display ( image 3 ), the prepared C 3 N 4 It is a semi-coiled tube with a length of micrometers. UV-Vis spectrophotometer analysis display ( Figure 4 ), the resulting mesoporous C 3 N 4 The light absorption of the sample is around 450nm and ...

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 0.6g of melamine, mix the mixed powders thoroughly and mix evenly, place them in a crucible, and heat treatment at 450°C in a muffle furnace 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. After the mixed powders are fully 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 a preparation method and application thereof, in particular to a method for preparing mesoporous C 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 a new and important organic polymer photocatalytic material, it has attracted much attention. Experiments have confirmed that C 3 N 4 In the degradation of organic pollutants, water decomposition and photocatalysis CO 2 It has good effects in reduction and has good application prospects 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, the current mesoporous C 3 N 4 The preparation of photocatalytic materials mostly uses mesoporous SiO 2 As a template...

Claims

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Application Information

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