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Ferroferric oxide @rGO@MIL-100 (Fe) photo-Fenton catalyst and preparation and application thereof

A technology of ferroferric oxide and catalyst, which is applied in the direction of physical/chemical process catalyst, organic compound/hydride/coordination complex catalyst, chemical instrument and method, etc., which can solve the problem of increasing water treatment operation cost, catalyst loss, increase Operating costs and other issues, to achieve the effect of excellent visible light catalytic activity, good affinity, and a wide range of applications

Active Publication Date: 2018-08-03
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these photo-Fenton methods still have some deficiencies in practical application: (1) the pH range of their adaptation is narrow
The reaction usually needs to be carried out in an acidic medium with a pH of 2.0 to 4.0, so the pH value of the wastewater needs to be adjusted in advance, and the final disposal must be neutralized, thereby increasing the operating cost of water treatment; (2) Homogeneous photo-Fenton degradation of organic In the system of pollutants, due to the existence of a large number of iron ions, it is difficult to separate the iron ions from the reaction medium after the reaction, which not only causes the loss of the catalyst, but also may cause secondary pollution problems; (3) the current photo-Fenton method mainly uses UV light is used as the light source, which will greatly increase the running cost

Method used

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  • Ferroferric oxide @rGO@MIL-100 (Fe) photo-Fenton catalyst and preparation and application thereof
  • Ferroferric oxide @rGO@MIL-100 (Fe) photo-Fenton catalyst and preparation and application thereof
  • Ferroferric oxide @rGO@MIL-100 (Fe) photo-Fenton catalyst and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 1) Preparation of ferroferric oxide by solvothermal method

[0056] Add 1.35g of ferric chloride hexahydrate to 40ml of ethylene glycol, stir for 30min with magnetic force, then add 3.6g of sodium acetate and 1.0g of polyethylene glycol, stir with magnetic force for 30min, pour into a stainless steel polyethylene reaction kettle, at 200℃ After reacting for 8 hours, it was washed several times with absolute ethanol, and dried at 60°C for 6 hours to obtain ferric oxide.

[0057] 2) Modified ferric oxide

[0058] Add 0.5ml of 3-aminopropyltriethoxysilane and 0.5g of ferric oxide into 100ml of isopropanol, stir mechanically at 80°C for 24h, recover by magnetic force, and dry at 60°C overnight.

[0059] 3) Preparation of graphene oxide

[0060] Add 2.0g of flake graphite powder, 1g of phosphorus pentoxide and 1g of potassium persulfate to 10ml of concentrated sulfuric acid, stir magnetically at 80°C for 4.5h, separate by suction filtration, and dry overnight; add it to 46m...

Embodiment 2

[0077] Fe 3 o 4 The preparation of @rGO@MIL-100(Fe)(10cycles) photo-Fenton catalyst is the same as Example 1.

[0078] Fe 3 o 4 @rGO@MIL-100(Fe)(10cycles) photocatalytic degradation of 2,4-dichlorophenol: put 100mL of 2,4-dichlorophenol wastewater with a concentration of 50mg / L in the reactor, and adjust the pH of the system to 5.5, add 0.02g Fe 3 o 4 @rGO@MIL-100(Fe)(10cycles) photocatalyst, adsorbed in the dark for 30min to reach equilibrium. Place it under a 500W xenon lamp for 1 hour, measure the change of the concentration of 2,4-dichlorophenol in the system, and obtain the degradation effect of 2,4-dichlorophenol wastewater: the degradation rate reaches 12.16% in 40 minutes.

Embodiment 3

[0080] Fe 3 o 4 The preparation of @rGO@MIL-100(Fe)(10cycles) photo-Fenton catalyst is the same as Example 1.

[0081] Fe 3 o 4 @rGO@MIL-100(Fe)(10cycles) Fenton catalyst degrades 2,4-dichlorophenol: put 100mL of 2,4-dichlorophenol wastewater with a concentration of 50mg / L in the reactor, and adjust the pH of the system is 5.5, add 0.02g Fe 3 o 4 @rGO@MIL-100(Fe)(10cycles) Fenton catalyst, adsorption in the dark for 30min to reach equilibrium. After reacting for 1 hour in the dark, the change of the concentration of 2,4-dichlorophenol in the system was measured, and the degradation effect of 2,4-dichlorophenol wastewater was obtained: the degradation rate reached 1.09% in 40 minutes.

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Abstract

The invention discloses a Fe3O4 @rGO@MIL-100 (Fe) photo-Fenton catalyst and preparation and application thereof. The photo-Fenton catalyst is formed by coating ferroferric oxide, partially-reduced graphene oxide and MIL-100 (Fe) layer by layer. A preparation method of the photo-Fenton catalyst comprises: firstly, preparing ferroferric oxide; then modifying the surface of the ferroferric oxide by 3-aminopropyltriethoxysilane; sequentially coating the graphene oxide and the MIL-100 (Fe); finally, carrying out vacuum high-temperature drying reduction to prepare the photo-Fenton catalyst. The catalyst is applied to photo-Fenton degradation on chlorphenol polluted wastewater, and has an excellent degradation effect; not only is a pH range of a Fenton reaction expanded, and a use amount of a H2O2 reagent is reduced, but also degradation efficiency of the Fenton reaction on the chlorphenol wastewater is greatly improved in the aspect of dynamics, and treatment cost of the chlorphenol wastewater is greatly reduced; the photocatalytic-Fenton catalyst is low in cost and environmental friendly, and has industrialized application prospect.

Description

technical field [0001] The invention relates to a catalyst, in particular to a Fe 3 o 4 @rGO@MIL-100(Fe) photo-Fenton catalyst and its preparation method, especially related to Fe 3 o 4 The application of @rGO@MIL-100(Fe) photo-Fenton catalyst in photocatalytic-like-Fenton degradation of chlorophenol wastewater belongs to the technical field of organic wastewater treatment. Background technique [0002] The Photo-Fenton method is an advanced chemical oxidation method, which uses the hydroxyl radicals generated by the system to degrade chlorophenols into small molecular organic compounds that are easy to biochemically degrade, and even completely mineralize them into carbon dioxide and water. There are many reports on photo-Fenton degradation of organic matter. Recently reported literature, such as related articles published in "Scientific Reports", "Journal of Hazardous Matierals", and "ChemCatChem": (1) Yang, X.; Chen, W. ; Huang, J.; Zhou, Y.; Zhu, Y.; Li, C., Rapid de...

Claims

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Application Information

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IPC IPC(8): B01J31/28B01J35/08C02F1/30C02F1/72C02F101/34C02F101/36
CPCC02F1/30C02F1/722C02F1/725B01J31/1691B01J31/28C02F2305/026C02F2305/10C02F2101/36C02F2101/345B01J35/51B01J35/39
Inventor 刘云宫庆娇
Owner XIANGTAN UNIV
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