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Preparation method and application of a continuous electron-donating iron-based metal-organic framework composite material

An organic framework, iron-based metal technology, applied in organic compound/hydride/coordination complex catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the waste of nano-iron materials and reduce the utilization efficiency of nano-iron and other problems to achieve the effect of ensuring degradation ability, improving utilization efficiency and good dispersibility

Active Publication Date: 2022-05-27
NANKAI UNIV
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  • Description
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  • Application Information

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Problems solved by technology

(Nanoencapsulation of hexavalentchromium with nanoscalezero-valent iron: High resolution chemical mapping of the passivation layer, 2018, 4-13) This corrosion resistance seriously reduces the utilization efficiency of nano-iron in in-situ restoration of the site, resulting in the failure of nano-iron materials. waste

Method used

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  • Preparation method and application of a continuous electron-donating iron-based metal-organic framework composite material
  • Preparation method and application of a continuous electron-donating iron-based metal-organic framework composite material
  • Preparation method and application of a continuous electron-donating iron-based metal-organic framework composite material

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Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0027] (1) Measure 45ml of deionized water and place it in a three-necked flask for deoxygenation for 20min, add 0.3046g of tannic acid, stir and dissolve fully, and obtain an organic framework solution.

[0028] (2) Add 0.2420g FeCl to the organic framework solution obtained in step (1) 3 ·6H 2 O(FeCl 3 ·6H 2 The molar ratio of O to tannic acid is 1:5), stirring at 1000r / min rotation speed for 0.3h to make it fully mixed to obtain a metal organic solution.

[0029] (3) Under stirring conditions, dropwise add 5 mL of sodium borohydride aqueous solution with a concentration of 0.54 mol / L to the above-mentioned system, and continue to stir the reaction for 30 min after the dropwise addition to ensure that the reaction is complete.

[0030] (4) After the reaction, the nano-iron particles were separated by magnetic separation, and then washed three times with deionized water and absolute ethanol, respectively, and the iron-based metal organic framework material was obtained aft...

preparation Embodiment 2

[0032] (1) Measure 45ml of deionized water and put it in a three-necked flask to deoxygenate for 20min, add 0.1523g of tannic acid, stir and dissolve fully, and obtain an organic framework solution.

[0033] (2) Add 0.2420g FeCl to the organic framework solution obtained in step (1) 3 ·6H 2 O(FeCl 3 ·6H 2 The molar ratio of O to tannic acid is 1:10), stirring at 1000r / min rotation speed for 0.3h to make it fully mixed to obtain a metal organic solution.

[0034] (3) Under stirring conditions, dropwise add 5 mL of sodium borohydride aqueous solution with a concentration of 0.54 mol / L to the above-mentioned system, and continue to stir the reaction for 30 min after the dropwise addition to ensure that the reaction is complete.

[0035] (4) After the reaction, the nano-iron particles were separated by magnetic separation, and then washed three times with deionized water and absolute ethanol, respectively, and the iron-based metal organic framework material was obtained after v...

preparation Embodiment 3

[0037] (1) Measure 45ml of deionized water and place it in a three-necked flask to deoxygenate for 20min, add 0.0762g of tannic acid, stir and dissolve fully, and obtain an organic framework solution.

[0038] (2) Add 0.2420g FeCl to the organic framework solution obtained in step (1) 3 ·6H 2 O(FeCl 3 ·6H 2 The molar ratio of O to tannic acid is 1:20), stirring at 1000r / min rotation speed for 0.3h to make it fully mixed to obtain a metal organic solution.

[0039] (3) Under stirring conditions, dropwise add 5 mL of sodium borohydride aqueous solution with a concentration of 0.54 mol / L to the above-mentioned system, and continue to stir the reaction for 30 min after the dropwise addition to ensure that the reaction is complete.

[0040](4) After the reaction, the nano-iron particles were separated by magnetic separation, and then washed three times with deionized water and absolute ethanol, respectively, and the iron-based metal organic framework material was obtained after ...

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Abstract

The invention provides a preparation method and application of a continuous electron-donating iron-based metal-organic framework composite material, which solves the problem of the formation of a dense oxide layer on the surface of nano-iron in the process of degrading pollutants, which hinders the electron transfer process and reduces the reaction rate. , and even lead to problems such as reaction termination and low practical application efficiency. It is characterized in that: while the organic ligand material is used to provide an organic framework to disperse and stabilize nano-metal iron, the ligand-complexed nano-iron is used to reduce and degrade iron ions generated in the process of pollutants, so that iron oxides and iron hydroxides are deposited On the organic framework, it is ensured that the nano-iron can continuously donate electrons. In the present invention, the nano-iron is modified by the organic ligand material, and the prepared composite material not only has excellent stability and dispersibility, but also can inhibit the formation of a passivation layer on the surface of the nano-iron, ensure the continuous supply of iron electrons in the reduction reaction, and realize nano-iron Full and effective use of iron materials.

Description

technical field [0001] The invention relates to the preparation and application of a continuous electron-donating iron-based metal-organic framework composite material, and belongs to the technical field of nanomaterial modification. Background technique [0002] Nano-iron has high surface activity, strong reducibility, and can degrade various pollutants. It has broad application prospects in soil and groundwater environmental pollution control, and is a research hotspot at home and abroad. At present, nano-iron materials can be mainly prepared by high-energy ball milling, liquid-phase reduction, microemulsion, pyrolysis of carbonyl iron and other methods, but the products prepared by these methods still exist in terms of stability, dispersibility, and oxidation resistance. There are some deficiencies that limit its practical application. [0003] By modifying the surface of nano-zero-valent iron and using the electrostatic effect and steric hindrance of the modifier to inh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00B01J31/22C02F1/00C02F101/22
CPCC08G83/008B01J31/2213C02F1/00C02F2101/22
Inventor 李铁龙李冰洁王薇高超林
Owner NANKAI UNIV
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