A foamed visible light catalytic material, preparation method and use thereof

A technology of photocatalytic materials and catalytic materials, applied in the field of semiconductor photocatalysis, to avoid the generation of by-products, solve the problem of light shielding, excellent photocatalytic activity and stability

Active Publication Date: 2021-08-27
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the foamy photocatalytic material can effectively solve the light shielding problem of pollutants

Method used

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  • A foamed visible light catalytic material, preparation method and use thereof
  • A foamed visible light catalytic material, preparation method and use thereof
  • A foamed visible light catalytic material, preparation method and use thereof

Examples

Experimental program
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preparation example Construction

[0040] The preparation method of the invention is simple and convenient, and the raw materials used are easy to obtain and low in price, can effectively avoid polluting by-products, and have no secondary pollution in the process. The prepared photocatalytic material has a low carrier recombination rate. The three-dimensional network structure can effectively increase the contact between the catalyst and pollutants, has excellent photocatalytic activity and stability, can be recycled, and has good practical application prospects. The foamy C of the present invention 3 N 4 Compared with the single powder, the / GO@MF photocatalytic material can effectively increase the adsorption capacity of pollutants, improve the photocatalytic performance, and the catalyst is easy to recycle.

[0041] The structure of the product prepared by the present invention is characterized by the following means: a Vario EL cube type elemental analyzer is used to analyze the composition of the sample....

Embodiment 1

[0046] Add 20 mg of graphene oxide (GO) to 38.5 mL of deionized water, and ultrasonicate for 60 min to make it uniformly dispersed. Add 2.0 g of urea (urea) to the GO dispersion and stir for 30 min to completely dissolve it in the GO dispersion. At this point, the concentrations of GO and urea in the precursor solution were 0.5 mg / mL and 50 mg / mL, respectively. Then melamine resin foam (MF) (1.5 × 1.5 × 2.0 cm) was immersed in the graphene oxide urea (GO-urea) solution, and GO and urea were uniformly dispersed on the MF by ultrasonication for 0.5 h. The foam adsorbed with GO and urea was placed in a 10 mL crucible with a lid and wrapped with tinfoil. Put it in a tube furnace, heat-treat and roast at 500°C for 4h in an argon atmosphere, and the heating rate is 2.5°C / min. After naturally cooling to room temperature, wash with water and absolute ethanol three times respectively, and vacuum dry at 55°C for 10 hours to obtain foamy C 3 N 4 / GO@MF photocatalyst.

[0047] The ob...

Embodiment 2

[0058] Prepare foamy C in Example 1 3 N 4 The process of / GO@MF catalytic material is the same, only the concentration of urea in the precursor solution is 0 mg / mL.

[0059] Elemental analysis, scanning electron microscope (SEM) analysis, infrared spectrum analysis, Raman spectrum analysis, ultraviolet-visible diffuse reflectance absorption (UV-vis DRS) spectrum analysis, fluorescence spectrum analysis and photocatalytic activity test were carried out on the obtained samples respectively.

[0060] See Table 1 for the elemental analysis results, where it can be seen that the ratio of carbon to nitrogen in Example 2 is 5.42, indicating that the material is mainly carbon material and GO is successfully incorporated into the foam to increase the carbon-nitrogen ratio of the material.

[0061] Figure 2(b) is a scanning electron microscope (SEM) photo of the sample prepared in Example 2, as shown in Figure 2(b), indicating that GO in the sample prepared in Example 2 was successfull...

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Abstract

The invention discloses a foamed visible light catalysis material, a preparation method and use thereof, and belongs to the field of semiconductor photocatalysis. The foamed photocatalytic material is made of C by an in-situ method. 3 N 4 Simultaneously with graphene oxide (GO) directly grown on melamine resin foam (MF) foam to obtain foamed C 3 N 4 / GO@MF photocatalytic material; the foamed C 3 N 4 C in / GO@MF photocatalytic material 3 N 4 It is mainly grown on the lamellar structure of GO, which is connected to the three-dimensional framework of MF. The raw materials used in the preparation method of the invention are simple and easy to obtain, the cost is low, and the preparation method is simple and feasible. C prepared by the present invention 3 N 4 The / GO@MF photocatalytic material has excellent adsorption performance, which can effectively increase the adsorption capacity of pollutants, improve the photocatalytic performance, and the catalyst is easy to recover. Visible light catalytic activity is high, good stability, reusable. The photocatalysis-adsorption synergistic system developed by the invention expands the technical field of wastewater treatment and has broad application prospects.

Description

technical field [0001] The invention belongs to the field of semiconductor photocatalysis, in particular to a foamy C 3 N 4 / GO@MF Visible photocatalytic material, its preparation method and its application in sewage treatment. Background technique [0002] Semiconductor materials can completely mineralize organic compounds by absorbing light of a certain wavelength. They have the advantages of direct use of sunlight, deep mineralization at room temperature, and environmental friendliness. question. At present, the research and application of photocatalysis mainly focus on TiO 2 Photocatalytic powder materials, but ultraviolet light only accounts for 5% of sunlight in nature, so the research and development of visible light catalysts has gradually attracted people's attention. Visible light-responsive metal-free catalyst C 3 N 4 Due to its superior chemical stability and good photocatalytic activity, it has become a research hotspot in recent years, making up for TiO ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/04B01J37/08B01J35/10C02F1/30C02F101/30C02F101/34C02F101/38
Inventor 霍宇凝张子平邹泉李蕙帆杨玉萍裴文凯丁梦娜李和兴
Owner SHANGHAI NORMAL UNIVERSITY
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