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ZnFe2O4/BiOBr magnetic photocatalyst and preparation method thereof

A photocatalyst, znfe2o4 technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of secondary pollution, separation and recovery, human health and environmental hazards, and achieve low cost, Easy-to-control, actionable effects

Inactive Publication Date: 2016-01-13
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the BiOBr / BiOCl composite photocatalyst provided by this invention remains in the water after degrading trace amounts of toxic and harmful substances in the water, and cannot be separated and recovered through simple operations, which may cause secondary pollution and still pose certain hazards to human health and the environment.

Method used

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  • ZnFe2O4/BiOBr magnetic photocatalyst and preparation method thereof
  • ZnFe2O4/BiOBr magnetic photocatalyst and preparation method thereof
  • ZnFe2O4/BiOBr magnetic photocatalyst and preparation method thereof

Examples

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preparation example Construction

[0034] A ZnFe 2 o 4 The preparation method of / BiOBr magnetic photocatalyst specifically comprises the following steps:

[0035] a. ZnCl 2 and FeCl 3 ·6H 2 O is dissolved in ethylene glycol solution with a molar ratio of 1:0.5-3, and stirred evenly to obtain solution A;

[0036] b. Add NaAc and polyethylene glycol to the solution A, stir evenly to obtain solution B;

[0037] c. Transfer the solution B to a reaction kettle, heat and react to obtain solution C and precipitate D;

[0038] d. Separate the solution C and the precipitate D, wash the precipitate D with ethanol, and dry it, the precipitate D is ZnFe 2 o 4 ;

[0039] e. Bi(NO 3 ) 3 ·5H 2 O and the precipitate D are dissolved in the acetic acid solution with a molar ratio of 1:0.6-1.2, and stirred evenly to obtain a solution E;

[0040] f. KBr is added to the solution E at a molar ratio twice that of the precipitate D, stirred evenly, and aged to obtain solution F and precipitate G;

[0041] g. Separate the ...

Embodiment 1

[0050] 2.5mmol of ZnCl 2 and 5 mmol FeCl 3 ·6H 2 O was dissolved in 40mL of ethylene glycol solution and stirred evenly to obtain solution A;

[0051] Weigh 3.6g of NaAc and 1.0g of polyethylene glycol 20000, pour them into the above solution A, and stir evenly, then mechanically stir the solution for 30min to obtain solution B;

[0052] Transfer the solution B to a 50mL reaction kettle, react at 200°C for 8 hours, separate the solution C and the precipitate D, wash the precipitate D with absolute ethanol 3 times, and dry it at 60°C for 6h, the obtained precipitate D is ZnFe 2 o 4 ,spare;

[0053] Weigh 2mmolZnFe 2 o 4 and 2mmol Bi(NO 3 ) 3 5H2O was ultrasonically dispersed into 100mL aqueous solution containing 5mL acetic acid, and stirred evenly at room temperature to obtain solution E;

[0054] Weigh 2mmol KBr, pour it into the above solution E, and stir evenly, then mechanically stir the solution for 60min, and age for 3h to obtain solution F and precipitate G; ...

Embodiment 2

[0058] 2.5mmol of ZnCl 2 and 1.25 mmol FeCl 3 ·6H 2 O was dissolved in 40mL of ethylene glycol solution and stirred evenly to obtain solution A;

[0059] Weigh 3.6g of NaAc and 1.0g of polyethylene glycol 20000, pour them into the above solution A, and stir evenly, then mechanically stir the solution for 30min to obtain solution B;

[0060] Transfer the solution B to a 50mL reaction kettle, react at 200°C for 8 hours, separate the solution C and the precipitate D, wash the precipitate D with absolute ethanol 3 times, and dry it at 60°C for 6h, the obtained precipitate D is ZnFe 2 o 4 ,spare;

[0061] Weigh 2mmolZnFe 2 o 4 and 2mmol Bi(NO 3 ) 3 ·5H 2 O was ultrasonically dispersed into 100 mL of aqueous solution containing 5 mL of acetic acid, and stirred evenly at room temperature to obtain solution E;

[0062] Weigh 2mmol KBr, pour it into the above solution E, and stir evenly, then mechanically stir the solution for 60min, and age for 3h to obtain solution F and p...

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Abstract

The invention relates to a ZnFe2O4 / BiOBr magnetic photocatalyst and a preparation method thereof. A semiconductor material BiOBr and a magnetic material ZnFe2O4 are compounded by a simple co-precipitation method under a condition of room temperature to obtain the magnetic photocatalytic material. The prepared magnetic photocatalytic material can effectively degrade rhodamine B in organic dye wastewater under visible light irradiation, can realize efficient recycling and repetitive cycle use under the magnetic effect of an additionally applied magnetic field, reduces the use cost of a catalytic material, and provides a new photocatalytic material for removal of organic pollutants in the environment; the synthesis method is simple, high in operability, and low in cost, has the conditions easy to control, and is beneficial for large-scale industrialized production and application; and the prepared composite material having a heterogeneous structure has the advantages of higher visible light catalytic activity and better magnetic separability and cycle stability.

Description

technical field [0001] The invention relates to a composite photocatalyst and a preparation method thereof, in particular to a ZnFe 2 o 4 / BiOBr magnetic photocatalyst and preparation method thereof. Background technique [0002] At present, the threat of trace toxic and harmful substances in water to human health and the environment cannot be ignored. [0003] The invention patent with application number 201110020036.2 discloses the preparation and application method of a BiOBr / BiOCl composite photocatalyst, which uses BiCl 3 and BiBr 3 As raw materials, BiOBr / BiOCl composite photocatalyst was prepared by hydrolysis, precipitation, solid-liquid separation and drying steps. The photocatalyst can be used to degrade organic matter in water, especially the treatment of trace toxic and harmful refractory organic matter in water. However, the BiOBr / BiOCl composite photocatalyst provided by this invention remains in the water after degrading trace toxic and harmful substances ...

Claims

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Application Information

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IPC IPC(8): B01J27/138C02F1/30C02F101/38
Inventor 徐建郭昌胜张远吕佳佩林海霞贺艳
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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