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Easy-to-recycle magnetic visible-light-induced photocatalyst and preparation method thereof

A visible light and catalyst technology, applied in the field of environment and energy, can solve the problems of sensitivity, low valence band potential, low photoelectric conversion efficiency, etc., and achieve the effects of inhibited recombination, increased absorption intensity and stable properties

Active Publication Date: 2020-09-29
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its low valence band potential and low photoelectric conversion efficiency make it unsuitable for direct photocatalytic degradation of organic dyes. However, zinc ferrite is magnetic and can be recycled at low cost by applying an external magnetic field, and it is sensitive to visible light. Advantage

Method used

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  • Easy-to-recycle magnetic visible-light-induced photocatalyst and preparation method thereof
  • Easy-to-recycle magnetic visible-light-induced photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1. ZnFe 2 o 4 Preparation of / BiOCl / TA ternary composite visible light catalyst:

[0045] Mix according to the mass ratio of bismuth nitrate pentahydrate (2g): tannic acid: water: ethanol is 1:0.01:30:5, and ultrasonically dissolve (in a 500W ultrasonic cleaner, ultrasonic for 10min), to obtain solution A; Potassium: water was mixed at a mass ratio of 1:150, ultrasonically dissolved to obtain solution B; the solution B was added dropwise to solution A at a mass ratio of 1:1, and stirred for 30 minutes to obtain mixed solution 1; Bismuth nitrate: the mass ratio of nano-zinc ferrite is 1:0.5 Add nano-zinc ferrite to the mixed solution 1, and continue stirring for 0.5h to obtain a mixed solution 2; place the mixed solution 2 in a hydrothermal reaction kettle , sealed and placed in an electric oven, raised to 120°C at a heating rate of 10°C / h, and kept at a constant temperature for 12 hours; then cooled to room temperature at a cooling rate of 10°C / h, centrifuged (5000r / m...

Embodiment 2

[0050] 1. ZnFe 2 o 4 Preparation of / BiOCl / TA ternary composite visible light catalyst:

[0051] Mix according to the mass ratio of bismuth nitrate pentahydrate (2g): tannic acid: water: ethanol is 1:0.05:50:10, ultrasonically dissolve (in 800W ultrasonic cleaner, ultrasonic 30min), obtain solution A; Potassium: water was mixed at a mass ratio of 1:250, ultrasonically dissolved to obtain solution B; the solution B was added dropwise to solution A at a mass ratio of 1:1, and stirred for 60 minutes to obtain a mixed solution 1; Bismuth nitrate: the mass ratio of nano-zinc ferrite is 1:1.5. Add nano-zinc ferrite to the mixed solution 1, and continue stirring for 1h to obtain a mixed solution 2; place the mixed solution 2 in a hydrothermal reaction kettle, After sealing, place it in an electric oven, raise the temperature to 160°C at a rate of 20°C / h, and keep the temperature constant for 24 hours; , ethanol, and water, washed twice, and dried in vacuum at 80°C to obtain ZnFe ...

Embodiment 3

[0056] 1. ZnFe 2 o 4 Preparation of / BiOCl / TA ternary composite visible light catalyst:

[0057] Mix according to the mass ratio of bismuth nitrate pentahydrate (2g): tannic acid: water: ethanol is 1:0.02:40:8, ultrasonically dissolve (in a 600W ultrasonic cleaner, ultrasonic 20min), obtain solution A; Potassium: water was mixed at a mass ratio of 1:200, ultrasonically dissolved to obtain solution B; the solution B was added dropwise to solution A according to the mass ratio of 1:1, and stirred for 50 minutes to obtain mixed solution 1; Bismuth nitrate: the mass ratio of nano-zinc ferrite is 1:1.0. Add nano-zinc ferrite to the mixed solution 1, and continue stirring for 0.7h to obtain a mixed solution 2; place the mixed solution 2 in a hydrothermal reaction kettle , sealed and placed in an electric oven, raised to 150°C at a heating rate of 15°C / h, and kept at a constant temperature for 20 hours; then, cooled to room temperature at a cooling rate of 15°C / h, centrifuged (6000...

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Abstract

The invention discloses an easy-to-recycle magnetic visible-light-induced photocatalyst and a preparation method thereof, and belongs to the technical field of environment and energy. A one-step solvothermal method is adopted to prepare the ternary composite visible-light-induced photocatalyst ZnFe2O4 / BiOCl / TA. Tannic acid rich in benzene rings and phenolic hydroxyl groups is introduced, and the coplanarity of atoms and groups in molecules is improved, so the absorption wavelength of the composite material has red shift, and the absorptive intensity is increased; a semiconductor heterojunctionformed by magnetic nano-ZnFe2O4 and BiOCl has synergistic effects, so the ZnFe2O4 / BiOCl / TA composite visible-light-induced photocatalyst can efficiently utilize visible light, effectively inhibit thecompounding of photo-induced electrons and holes and efficiently degrade organic wastewater, especially high-concentration antibiotic wastewater. The preparation process is simple, and the catalyst is easily recycled by an external magnetic field and is the efficient visible-light-induced photocatalyst with industrial application value.

Description

technical field [0001] The invention relates to an easily recyclable magnetic visible light catalyst and a preparation method thereof, belonging to the technical field of environment and energy. Background technique [0002] With the acceleration of the industrialization process in modern society, a large amount of industrial wastewater discharged contains different types of pollutants, causing serious damage to the ecological environment and posing a great threat to human living environment and physical health. Therefore, it is becoming more and more urgent and important to effectively solve the problem of environmental pollution. It is of great practical significance to develop a water pollution treatment method that can improve the quality of water in the ecosystem, is low in cost, easy to popularize and apply, and has high efficiency. Photocatalytic degradation technology uses sunlight through semiconductors to directly interact with pollutants in water, and can complet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02B01J31/28B01J27/06B01J23/80C02F1/30C02F101/30C02F101/38
CPCB01J31/28B01J23/80B01J27/06B01J31/0209C02F1/30C02F2305/10C02F2101/30C02F2101/38C02F2101/40B01J35/33B01J35/39
Inventor 顾文秀宋启军李海新王婵赵媛滕跃邹路易方御
Owner JIANGNAN UNIV
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