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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 molten salt method for preparing C3N4 photocatalytic materials and a preparation method. Water-soluble low melting point molten salt and melamine are fully mixed, and small droplets of molten salt at the melting temperature of the molten salt are used as barrier layers, and C3N4 is wrapped around the small droplets. The droplets grow, and after the reaction, the molten salt is recovered by washing with water to obtain the C3N4 photocatalytic material. The C3N4 material has a worm-like mesoporous structure, and the mesopore size is 3.8±1nm. Its formation mechanism is to use small droplets of molten salt as a growth barrier. During preparation, water-soluble low-melting point chloride salt is used as molten salt, which is fully mixed with melamine. The mixture is heat-treated in a muffle furnace at 400-680°C for 1-5 hours. The heat-treated sample is washed with water to recover the molten salt to obtain mesopores. C3N4 photocatalytic material. No template introduction process is required, it is simple and easy to implement and is easy for large-scale industrial production.

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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