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A highly dispersed magnetic nano photocatalyst and its preparation method

A nano-photocatalyst, high-dispersion technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve secondary pollution, low photocatalytic activity, high photogenerated hole-electron recombination rate, etc. problems, to achieve the effect of high dispersion in water phase, simple control steps and low reagent cost

Active Publication Date: 2022-02-22
XI AN JIAOTONG UNIV
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  • Description
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AI Technical Summary

Problems solved by technology

However, with the deepening of the research, some defects were also found: (1) g-C 3 N 4 The photogenerated hole-electron recombination rate is high and the quantum efficiency is low, resulting in low photocatalytic activity; (2) due to g-C 3 N 4 It only absorbs light with wavelength λ3 N 4 The photocatalytic performance is not ideal; (3) the g-C 3 N 4 After being used in the water environment, it is difficult to separate from the water environment, causing secondary pollution
[0005] In addition, nano g-C prepared by existing methods 3 N 4 / ZnFe 2 o 4 When used in a water environment, it is easy to agglomerate, resulting in a decrease in the contact / reaction area between the catalyst and pollutants, and the reaction rate of organic pollutant degradation is not high

Method used

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  • A highly dispersed magnetic nano photocatalyst and its preparation method
  • A highly dispersed magnetic nano photocatalyst and its preparation method
  • A highly dispersed magnetic nano photocatalyst and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Synthetic g-C 3 N 4 / ZnFe 2 o 4 (10:1) nano catalyst (g-C in step (2) 3 N 4 with ZnFe 2 o 4 The mass ratio is 10:1).

[0046] Specific steps are as follows:

[0047] (1) Preparation of g-C by calcination 3 N 4 Powder: CH 4 N 2O (urea) was placed in a muffle furnace, heated to 550°C at a rate of 2.5°C / min, and calcined for 4 hours to obtain g-C 3 N 4 powder.

[0048] (2) Preparation of precursor solution: first, add the g-C obtained in step (1) to water 3 N 4 powder, and stirred and mixed, and then ultrasonicated at 400W for 30 minutes to obtain a uniformly dispersed suspension A. After the suspension stood for 12 hours, g-C 3 N 4 Still uniformly dispersed in water, g-C in suspension A 3 N 4 The concentration is 6g / L. Secondly, Fe(NO 3 ) 3 9H 2 O and Zn(NO 3 ) 2 ·6H 2 O, stirred to form solution B, Fe in solution B 3+ The concentration is 2.50mmol / L, Zn 2+ The concentration is 1.25mmol / L. Finally, solution B was added dropwise at a rate of 0....

Embodiment 2

[0052] Synthetic g-C 3 N 4 / ZnFe 2 o 4 (5:2) nano catalyst (g-C in step (2) 3 N 4 with ZnFe 2 o 4 The mass ratio is 5:2).

[0053] Specific steps are as follows:

[0054] (1) Preparation of g-C by calcination 3 N 4 Powder: CH 4 N 2 O (urea) is placed in a muffle furnace, heated to 500°C at a rate of 4°C / min, and calcined for 2 hours to obtain g-C 3 N 4 powder.

[0055] (2) Preparation of precursor solution: first, add the g-C obtained in step (1) to water 3 N 4 Powder, and stir to mix, and then ultrasonic 60min under 400W power to obtain a uniformly dispersed suspension A, after the suspension stood for 12h g-C 3 N 4 Still uniformly dispersed in water, g-C in suspension A 3 N 4 The concentration is 5g / L. Secondly, Fe(NO 3 ) 3 9H 2 O and Zn(NO 3 ) 2 ·6H 2 O, stirred to form solution B, Fe in solution B 3+ The concentration is 10.00mmol / L, Zn 2+ The concentration is 5.00mmol / L. Finally, solution B was added dropwise at a rate of 0.2ml / s to the contin...

Embodiment 3

[0059] Synthetic g-C 3 N 4 / ZnFe 2 o 4 (1:1) nano catalyst (g-C in step (2) 3 N 4 with ZnFe 2 o 4 The mass ratio is 1:1).

[0060] Specific steps are as follows:

[0061] (1) Preparation of g-C by calcination 3 N 4 Powder: CH 4 N 2 O (urea) is placed in a muffle furnace, heated to 530°C at a rate of 3°C / min, and calcined for 3 hours to obtain g-C 3 N 4 powder.

[0062] (2) Prepare the precursor solution: first, add the g-C obtained in (1) to water 3 N 4 powder, and stirred and mixed, and then ultrasonicated at 400W for 90 minutes to obtain a uniformly dispersed suspension A. After the suspension stood for 12 hours, g-C 3 N 4 Still uniformly dispersed in water, g-C in suspension A 3 N 4 The concentration is 4g / L. Secondly, the ratio of the amount of substances added to water is 2:1 C 15 h 21 FeO 6 and Zn(CH 3 COO) 2 , stirred to form solution B, Fe in solution B 3+ The concentration is 50.00mmol / L, Zn 2+ The concentration is 25.00mmol / L. Finally, sol...

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Abstract

A highly dispersed magnetic nano-photocatalyst and preparation method, adding g-C to water 3 N 4 powder, after stirring and ultrasonication, a uniformly dispersed suspension A is obtained; adding Fe to water 3+ Salt and Zn 2+ salt, stir to obtain solution B; add solution B dropwise to suspension A, adjust the pH value to 11.0-13.0, stir for 30min-60min, and then hydrothermally react at 90℃-110℃ for 4h-8h to form a solid powder It is a highly dispersed magnetic composite photocatalyst. g-C synthesized by the present invention 3 N 4 / ZnFe 2 o 4 The nano photocatalyst has good water phase dispersibility, increases the contact / reaction area between the catalyst and pollutants, and the photocatalytic reaction rate is significantly improved. At the same time, when an external magnetic field is applied, it can be completely separated from water without causing secondary pollution.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, and in particular relates to a highly dispersed magnetic nano photocatalyst and a preparation method. Background technique [0002] In recent years, antibiotics have been widely used in daily life, and their indiscriminate discharge and metabolism into the water environment lead to the widespread existence of antibiotic-like organic pollutants in water bodies, causing serious environmental problems. For example, ciprofloxacin is a third-generation quinolone antibiotic, which is difficult to degrade in the environment. Long-term presence in the environment will cause bacteria to develop drug-resistant genes, which poses a huge threat to the ecological environment and human health. Therefore, how to efficiently remove ciprofloxacin in the water environment is particularly important. [0003] Semiconductor photocatalysis technology is a green and efficient method to control water environmental p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J37/10B82Y30/00B82Y40/00C02F1/30C02F101/30C02F101/34C02F101/36C02F101/38
Inventor 商亚博陈美娟陈科皓
Owner XI AN JIAOTONG UNIV
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