A method of preparing a magnetic ZnFe<2>O4/g-C3N4 composite photocatalytic material

A composite photocatalysis and znfe2o4 technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problem of high photogenerated electron-hole recombination rate, single function, and low recyclability and other problems, to achieve the effect of increasing recyclability, easy operation, and increasing composite catalytic activity

Active Publication Date: 2017-02-08
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] For the current semiconductor ZnO / g-C 3 N 4 Composite and Magnetic Fe 3 o 4 / g -C 3 N 4 Compounding has a single function, and it is difficult to effectively solve g-C synchronously 3 N 4 The shortcomings of low recyclability and high photogenerated electron-hole recombination rate, as well as the existing ZnFe 2 o 4 The present invention has the disadvantages of wasting water resources and easily polluting the environment in the preparation process, and the invention provides a magnetic ZnFe 2 o 4 / g -C 3 N 4 Preparation method of composite photocatalytic material, used to make up for the above-mentioned shortcomings

Method used

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  • A method of preparing a magnetic ZnFe&lt;2&gt;O4/g-C3N4 composite photocatalytic material
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Experimental program
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Embodiment 1

[0024] (1) Weigh 2.97g Zn(NO 3 ) 2 ·6H 2 O and 8.08g Fe(NO 3 ) 3 9H 2 O, add 2g of polyethylene glycol 400 (Xilong Chemical Industry, CP 500ml) and 20g of water into the mixed solution and stir to mix, place in a 30°C water bath and stir for 1h to form a mixed solution;

[0025] (2) Weigh 5.8g of citric acid and add it to the mixed solution obtained in step (1), place it in a water bath at 80°C and stir for 1.5h to obtain viscous ZnFe 2 o 4 Precursor;

[0026] (3) Weigh 4.8g of melamine and add it to the viscous ZnFe2O4 precursor obtained in step (2), place it in a water bath at 85°C and continue stirring for 1h to obtain a porous solid, and then dry the porous solid in an oven at 120°C After 12 hours, calcine in a muffle furnace at 550°C for 3 hours to obtain magnetic ZnFe 2 o 4 / g -C 3 N 4 Composite photocatalytic material 2.31g. figure 1 The ZnFe with magnetic and photocatalytic activity prepared for this example 2 o 4 / g -C 3 N 4 XRD patterns of composite p...

Embodiment 2

[0028] (1) Weigh 1.49g Zn(NO 3 ) 2 ·6H 2 O and 4.04g Fe(NO 3 ) 3 9H 2 O, add 1.5g Polyethylene Glycol 400 (Xilong Chemical Industry, CP 500ml) and 12g water mixed solution and stir to mix, place in 40 ℃ water bath and stir for 0.5h to form mixed solution;

[0029] (2) Weigh 2.88g of citric acid and add it to the mixed solution obtained in step (1), place it in a water bath at 85°C and stir for 1h to obtain viscous ZnFe 2 o 4 Precursor;

[0030] (3) take by weighing 2.5g melamine and join the viscous shape ZnFe that step (2) obtains 2 o 4 Put the precursor in a 90°C water bath and continue to stir for 0.5h to obtain a porous solid, then dry the porous solid in an oven at 110°C for 8h, and then calcinate it in a muffle furnace at 560°C for 3h to obtain magnetic ZnFe 2 o 4 / g -C 3 N 4 Composite photocatalytic material 1.3g.

Embodiment 3

[0032] (1) Weigh 2.97g Zn(NO 3 ) 2 ·6H 2 O and 8.08g Fe(NO 3 ) 3 9H 2 O, add 2.5g Polyethylene Glycol 400 (Xilong Chemical Industry, CP 500ml) and 22g water mixed solution and stir to mix, place in 35 ℃ water bath and stir for 1h to form mixed solution;

[0033] (2) Weigh 5.8g of citric acid and add it to the mixed solution obtained in step (1), place it in a water bath at 80°C and stir for 1.5h to obtain viscous ZnFe 2 o 4 Precursor;

[0034] (3) take by weighing 5.0g melamine and join the viscous shape ZnFe that step (2) obtains 2 o 4 Put the precursor in a water bath at 90°C and continue to stir for 1 hour to obtain a porous solid, then dry the porous solid in an oven at 130°C for 12 hours, and then calcinate it in a muffle furnace at 600°C for 3 hours to obtain magnetic ZnFe 2 o 4 / g -C 3 N 4 Composite photocatalytic material 2.38g.

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Abstract

A method of preparing a magnetic ZnFe<2>O4/g-C3N4 composite photocatalytic material is disclosed. The method prepares the composite photocatalytic material through a process combining sol gel and calcination. The method includes dissolving Zn(NO3)<2>.6H2O and Fe(NO3)<3>.9H2O into a proper amount of a mixed solution of polyethylene glycol 400 and water, putting into a water bath, stirring for a certain period of time, adding citric acid, putting into a water bath, reacting, adding melamine into the prepared precursor, continuously stirring to form gel, and performing calcination in a muffle furnace to obtain the composite photocatalytic material having high catalytic activity. The method overcomes disadvantages that the photocatalytic efficiency is low and recoverability is poor of a novel semiconductor material g-C3N4. A process of preparing the composite photocatalytic material has advantages of simple and convenient procedures, a high efficiency and easy operation, and avoids generation of waste water and waste residues. The composite photocatalytic material can replace TiO2, ZnO, and other traditional photocatalysts and be applied to photocatalytic purification of organic waste water pollution and air pollution.

Description

[0001] (1) Technical field [0002] The invention relates to a preparation method of a photocatalytic material, in particular to a magnetic ZnFe 2 o 4 / g -C 3 N 4 Preparation method of composite photocatalytic material. [0003] (2) Background technology [0004] With the acceleration of industrialization, environmental pollution has increasingly become an unfavorable factor restricting social development, among which water pollution is most closely related to daily life and has attracted widespread attention. Due to its complex composition, high toxicity and poor degradability, organic wastewater in water pollution has become a difficult problem in wastewater treatment. Since the Japanese scientist Honda-Fujishima discovered N-TiO in 1972 2 After the photocatalytic water splitting reaction can occur on the semiconductor electrode, the semiconductor as a photocatalyst has attracted more and more attention, but because TiO 2 It has a high band gap (3.2eV for anatase type),...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
CPCB01J27/24B01J35/0033B01J35/004
Inventor 孙青盛嘉伟张俭秦丰徐林智
Owner ZHEJIANG UNIV OF TECH
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