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Fe3O4-rGO (reduced graphene oxide)-Ag composite material, method for preparing same and application of Fe3O4-rGO-Ag composite material

A composite material and reaction technology, applied in separation methods, chemical instruments and methods, and other chemical processes, etc., can solve the problems of high operating costs, high mercury costs, and pollution of desulfurized gypsum, and achieve lower operating costs, direct economic benefits, The effect of large specific surface area

Inactive Publication Date: 2017-08-11
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In terms of the application of adsorbents, activated carbon has the widest application range, but due to the high cost of mercury control, it has not been well promoted in actual industrial enterprises.
Patent CN 102553522A (an oxidative adsorbent for mercury removal in coal-fired flue gas) proposed to use a mixture of montmorillonite and activated carbon as a carrier on the basis of activated carbon, and support copper chloride and manganese chloride as active components To remove mercury by adsorption, the principle is to first remove the elemental mercury Hg contained in the flue gas 0 Oxidation on the surface of the adsorbent to Hg + or Hg 2+ , and then adsorb the mercury on the surface of the adsorbent, thereby removing the mercury from the flue gas. This method cannot recycle the adsorbent, and the operating cost is high; the patent CN200910244547.5 (a method for flue gas desulfurization and mercury removal) proposes the use of The method uses lime / Ca(OH) 2 As a desulfurizer, circulating desulfurization ash is used as an auxiliary desulfurizer to achieve desulfurization and demercuration of flue gas. This method belongs to calcium-based adsorbents. Although it can achieve the purpose of simultaneously removing sulfur oxides and mercury, its own removal The efficiency is not high, and certain methods need to be adopted to improve its removal efficiency, and the desulfurization gypsum is polluted
In addition, there are also patents CN201110030287.9, CN200610102077.5, CN 102430328 B, CN102515162 A, etc., which report some new adsorbents, but there are no reports that can achieve high-efficiency mercury removal and recycling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] a kind of Fe 3 o 4 - rGO-Ag composite material, the composite material by loading Fe on the graphene oxide support GO 3 o 4 and Ag get. In this composite material, the weight percent of each component is: graphene oxide 42.5%; Fe 3 o 4 48.4%; Ag 9.1%.

[0030] The Fe 3 o 4 -The preparation method of rGO-Ag composite material, comprises the following steps:

[0031] 1) Prepare graphene oxide GO by the Hummers method, ultrasonically disperse 100mg GO in 50ml ethylene glycol, add 0.40g FeCl 3 ·6H 2O, after stirring at a constant speed at room temperature for 2 hours, add 1g of PEG, stir evenly, transfer to the reaction kettle, react at 220°C for 10 hours, wash the solution by centrifugation with ethanol for 3 to 5 times, and remove impurities by magnetic separation to obtain crude product A, which is washed with water for 3 After ~5 times, place it in a vacuum drying oven at 50°C for 24 hours to obtain Fe 3 o 4 - rGO composite material; wherein, the amount rat...

Embodiment 2

[0035] a kind of Fe 3 o 4 - rGO-Ag composite material, the composite material by loading Fe on the graphene oxide support GO 3 o 4 and Ag get. In the composite material, the weight percent of each component is: graphene oxide 23.9%; Fe 3 o 4 67.4%; Ag 8.7%.

[0036] The Fe 3 o 4 -The preparation method of rGO-Ag composite material, comprises the following steps:

[0037] 1) Prepare graphene oxide GO by the Hummers method, ultrasonically disperse 200mg GO in 100ml ethylene glycol, add 1g Fe(NO 3 ) 3 9H 2 O, after stirring at a constant speed at room temperature for 2 hours, add 2 g of PEG, stir evenly, transfer to the reaction kettle, react at 220 ° C for 12 hours, and centrifuge the reaction solution with ethanol for 3 to 5 times, remove impurities by magnetic separation to obtain crude product A, and the crude product A is After washing with water for 3 to 5 times, place it in a vacuum drying oven at 80°C for 20 hours to obtain Fe 3 o 4 - rGO composite material;...

Embodiment 3

[0041] a kind of Fe 3 o 4 - rGO-Ag composite material, the composite material by loading Fe on the graphene oxide support GO 3 o 4 and Ag get. In the composite material, the weight percent of each component is: graphene oxide 57.8%; Fe 3 o 4 33.1%; Ag 9.1%.

[0042] The Fe 3 o 4 -The preparation method of rGO-Ag composite material is the same as Example 1, and the difference is that in step 1), the amount ratio of graphene oxide GO, iron precursor, ethylene glycol and polyethylene glycol four is 1g: 2g: 200ml: 5g; step 2) in, the precursor of silver and Fe 3 o 4 The mass ratio of -rGO composite is 0.16:1.

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Abstract

The invention discloses an Fe3O4-rGO (reduced graphene oxide)-Ag composite material. Active components Fe3O4 and Ag are loaded on graphene oxide (GO) which is a carrier to obtain the Fe3O4-rGO-Ag composite material. The invention further discloses a method for preparing the Fe3O4-rGO-Ag composite material and application thereof. The Fe3O4-rGO-Ag composite material, the method and the application have the advantages that characteristics of large specific surface areas and multiple functional groups of reduced graphene oxide are utilized, silver and iron which are good in adsorption performance can be loaded, the silver is precious metal, the iron is a magnetic material, and accordingly the zero-valent mercury removal efficiency can reach 90% at least; magnetic composite adsorption materials can be separated and recycled by magnetic separation means, can be regenerated at the high temperatures and then can be reused, metal mercury with extremely high purity can be recycled, accordingly, the operation cost can be reduced to a great extent, and the Fe3O4-rGO-Ag composite material and the method can have direct economic benefits.

Description

technical field [0001] The invention belongs to the field of atmospheric environment protection, in particular to a Fe 3 o 4 -rGO-Ag composite material and its preparation method and application, using it to adsorb and remove zero-valent mercury in exhaust gas to purify flue gas, and realize the recovery and reuse of adsorbent. Background technique [0002] Heavy metal mercury has the characteristics of persistence, accumulation, easy migration and high bioaccumulation, and is listed as a global pollutant by the United Nations Environment Program, which is very harmful to the environment and human health. The organic mercury poisoning incident near Minamata Bay in Japan in the 1950s was called the "Minamata Disease" incident, which was a serious mercury pollution disaster. In recent years, there have been many mercury pollution accidents in my country, such as the Baihua Lake mercury pollution accident in Guiyang, the Beibei mercury pollution incident in Chongqing, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01D53/02
CPCB01D53/02B01D2257/602B01D2258/0283B01J20/0229B01J20/0233B01J20/20
Inventor 马永鹏李玲张肖静母佰龙张宏忠
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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