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Zinc ferrite-cobalt ferrite heterojunction composite catalyst and its preparation method and application

A composite catalyst, cobalt ferrite technology, applied in the field of water treatment, can solve the problems of weak redox ability, low sunlight utilization rate, low photon quantum yield, etc., to improve photocatalytic activity, reduce energy consumption, and high photoelectric efficiency Effect

Active Publication Date: 2021-01-26
LIAONING UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In nature, the ultraviolet content in sunlight is low, only accounting for about 4% of the total illuminance of sunlight, and the utilization rate of sunlight is low.
In addition, the recombination of photogenerated electrons and electron holes also leads to low photon quantum yield, which limits the practical application of this technology.
[0003] The study found that ferrite catalysts have good catalytic performance, and ferrite is favored due to its cheap and easy-to-obtain advantages. The energy band gap of ferrite is narrow (about 2.0eV), and its absorption of light is mainly Concentrated around 500nm, the material can make full use of visible light, but the band gap of ferrite is narrow, photogenerated electrons and holes are easy to recombine, and its redox ability is weak

Method used

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  • Zinc ferrite-cobalt ferrite heterojunction composite catalyst and its preparation method and application
  • Zinc ferrite-cobalt ferrite heterojunction composite catalyst and its preparation method and application
  • Zinc ferrite-cobalt ferrite heterojunction composite catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025](1) Preparation of cobalt ferrite

[0026]1.72g Fe(NO3)3·9H2O and 0.62g Co(NO3)2·6H2O was dissolved in 25ml of water and stirred for 30 minutes to obtain a uniform solution. Adjust the pH of the solution to 12 with 6M NaOH, continue to stir for 60 minutes, and put the resulting solution in a Teflon-lined reactor at 180℃ hydrothermally 12h, the obtained solid was washed three times with secondary water and absolute ethanol, and dried in an oven at 60℃ for 12h to obtain cobalt ferrite CoFe2O4.

[0027](2) Preparation of zinc ferrite

[0028]Put 4.16g Zn(NO3)2·6H2O, 7.78g FeSO4·7H2O and 1.23g of dodecyltrimethylammonium bromide (CTAB) were dissolved in 35ml of water to obtain a homogeneous solution. Then, add Na2C2O4Aqueous solution (3.75g Na2C2O4Dissolved in 35ml water) to make n(Zn2+): n(Fe2+): n(CTAB): n(C2O4-) = 1:2:0.25:2, the resulting solution was stirred for 20 minutes, the resulting mixed solution was put into a Teflon-lined reaction kettle, and hydrothermally reacted at 100°C fo...

Embodiment 2

[0034]Method: Dissolve the zinc ferrite-cobalt ferrite heterojunction composite catalyst prepared in Example 1 in different proportions in the secondary water, and then evenly load it on the carbon paper with a pipette, and bake it with an infrared lamp for about 20 minutes. The catalysts are dried and used as working electrodes, platinum wire as counter electrode, calomel electrode as reference electrode, and placed in a reaction vessel to form a three-electrode system.

[0035]Add the waste water and electrolyte solution containing organic pollutants into the reaction vessel, adjust the pH to 7-10, Na2SO4As a conductive medium, the three-electrode system is then immersed in the solution so that the liquid surface has just submerged the catalyst. The electrochemical workstation is given a voltage of 0.8V and a xenon lamp provides the light source, and the xenon lamp is irradiated for 120 minutes. The distance between the xenon lamp and the liquid surface of the mixed solution of organ...

Embodiment 3

[0050]Method: The zinc ferrite-cobalt ferrite heterojunction composite catalyst prepared in Example 1 with a molar ratio of zinc ferrite: cobalt ferrite = 10:1 was dissolved in secondary water, and then uniformly distributed with a pipette Load it on carbon paper, use an infrared lamp to bake for about 20 minutes, and then bake the catalyst to dryness. As a working electrode, a platinum wire is a counter electrode and a calomel electrode is a reference electrode, placed in a reaction vessel to form a three-electrode system.

[0051]In 50mL wastewater containing 10ppm organic pollutants as shown in Table 2, add 0.7102g Na2SO4A mixed solution is formed, the pH of the solution is changed to 9 by adding sodium hydroxide to the solution, a voltage of 0.8V is applied by an electrochemical workstation, a xenon lamp provides a light source, and the xenon lamp is irradiated for 120 minutes. The mixed solution is subjected to photoelectric catalytic degradation, and then the absorbance A is meas...

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Abstract

The invention relates to a zinc ferrite-cobalt ferrite heterojunction composite catalyst and a preparation method and application thereof. Visible light-responsive zinc ferrite-cobalt ferrite heterojunction catalyst degrades organic pollutants, oxidative degradation of tetracycline, chlortetracycline, and oxytetracycline for 120 minutes, 78% degradation effect for tetracycline, and 120 minutes for p-nitrophenol Reductive degradation can achieve a degradation effect of more than 60%. The invention has the characteristics of simplicity, mildness, high efficiency, low cost, and high absorption of visible light. The prepared zinc ferrite-cobalt ferrite heterojunction electrode material has the characteristics of narrow band gap and large specific surface area, and has good visible light Absorption performance and good stability, high photoelectric efficiency, good effect of photocatalytic degradation of organic matter, can be applied to the fields of photocatalytic degradation of organic matter and sensors.

Description

Technical field[0001]The invention relates to a visible light-responsive zinc ferrite-cobalt ferrite heterojunction composite catalyst and its application in degrading organic pollutants, and is mainly aimed at wastewater from the pharmaceutical industry, belonging to the field of water treatment.Background technique[0002]As a new type of wastewater treatment technology, photoelectric catalysis has shown broad application prospects in the advanced treatment of organic wastewater. It has been widely concerned by researchers at home and abroad for its outstanding advantages in the thorough degradation of organic pollutants. The photoelectrocatalytic process has the unique advantages of almost no selectivity in the degradation of organic matter, can completely degrade organic pollutants, no secondary pollution, simple equipment, low investment, and good effect. Photoelectrocatalytic oxidation technology is a semiconductor catalyst that generates holes with strong oxidizing ability thro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/80C02F1/30C02F101/34C02F101/38
CPCC02F1/30B01J23/002B01J23/80C02F2305/10C02F2101/345C02F2101/38B01J2523/00B01J35/39B01J2523/845B01J2523/842B01J2523/27
Inventor 李莹张蕾杨真其他发明人请求不公开姓名
Owner LIAONING UNIVERSITY
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