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Preparation method for rapidly growing metal organic framework derivative with assistance of metal salt

A metal-organic framework, metal salt technology, applied in rayon manufacturing, fiber chemical characteristics, electrical components, etc., can solve the obstacles that hinder the large-scale production and industrial application of MOF materials, large-scale commercial application limitations, and expensive layer deposition methods. To achieve the effect of enriching high active sites, reducing production costs and safety hazards, and improving electrocatalytic performance

Active Publication Date: 2021-06-29
UNIV OF SCI & TECH BEIJING
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the secondary growth and in-situ crystallization methods consume a large amount of solution and generate a large amount of waste liquid, which greatly hinders the large-scale production and industrial application of MOF materials; the layer deposition method equipment is relatively expensive, and currently large-scale commercial App is restricted

Method used

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  • Preparation method for rapidly growing metal organic framework derivative with assistance of metal salt
  • Preparation method for rapidly growing metal organic framework derivative with assistance of metal salt
  • Preparation method for rapidly growing metal organic framework derivative with assistance of metal salt

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preparation example Construction

[0028] The invention provides a preparation method of a metal salt assisted rapid growth metal organic framework derivative.

[0029] In this method, metal salts and high molecular polymers are first added to organic solvents, and the mixed solution is obtained by thorough stirring, and the metal salt / polymer nanofiber membrane is obtained by electrospinning technology, and then the organic ligands required for the growth of MOFs containing metal organic frameworks are mixed. The body solution is evenly coated on the metal salt / polymer nanofiber membrane, and then the chemical bond between the metal ion and the ligand in the nanofiber is realized by hot pressing technology, so that the MOF material grows densely and uniformly on the nanofiber membrane, and the MOF / nano Metal-embedded nitrogen-doped porous carbon nanofibers were formed after the fiber membrane was calcined under inert gas.

[0030] Such as figure 1 As shown, the specific steps are as follows:

[0031] (1) Add...

Embodiment 1

[0036] The first step, preparation of metal salt / polyacrylonitrile (PAN) nanofiber membrane

[0037] Add 1.0 g of polyacrylonitrile (PAN) and 1.0 g of cobalt acetate into 10 mL of dimethylformamide solution, and magnetically stir for 10 h at room temperature to form a uniform spinning solution. The above spinning solution was transferred to a 10mL syringe and placed on a syringe pump, and a cobalt acetate / polyacrylonitrile (PAN) nanofiber membrane was obtained by electrospinning technology. The applied voltage for spinning is 12-20kV, the feed rate of the syringe pump is 0.6mL / h, the distance between the needle and the roller receiver is 20cm, and the needle of the syringe is 19#.

[0038] The second step, preparation of ZIF-8 / PAN nanofiber membrane

[0039] Such as figure 1 As shown, 0.35g dimethylimidazole (2-MeIm) and 5mL polyethylene glycol (PEG200) were placed in a mortar and ground evenly, and then coated on the cobalt acetate / polyacrylonitrile (PAN) nanofiber membrane...

Embodiment 2

[0043] The first step is to prepare bimetallic salt / polyacrylonitrile (PAN) nanofiber membrane:

[0044] Add 1.0 g of polyacrylonitrile, 0.47 g of cobalt acetate, and 0.53 g of zinc acetate into 10 mL of dimethylformamide solution, and magnetically stir for 10 h at room temperature to form a uniform spinning solution. The above spinning solution was transferred into a 10mL syringe and placed on a syringe pump, and cobalt acetate-zinc acetate / PAN nanofiber membrane was obtained by electrospinning technology. The applied voltage for spinning is 12-20kV, the feed rate of the syringe pump is 0.6mL / h, the distance between the needle and the roller receiver is 20cm, and the needle of the syringe is 19#.

[0045] The second step, preparation of bimetallic organic framework (BMZIF) / PAN nanofibrous membrane

[0046] The polyethylene glycol (PEG200) of 0.35g dimethylimidazole (2-MeIm) and 5ml is placed in mortar and grinds evenly, is then coated on zinc acetate / cobalt acetate / polyacrylon...

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Abstract

The invention provides a preparation method for rapidly growing a metal organic framework derivative with assistance of a metal salt, and belongs to the technical field of nano material preparation and fuel cell catalysis. The preparation method comprises the following steps of: firstly, adding the metal salt and a high-molecular polymer into an organic solvent, stirring to obtain a mixed solution, acquiring a metal salt / high-molecular nanofiber membrane by adopting an electrostatic spinning technology, and then uniformly coating the metal salt / high-molecular nanofiber membrane with an organic ligand solution required by the growth of the MOF; and secondly, achieving chemical bond combination of metal ions and ligands in nanofibers through adopting a hot pressing technology, so that the MOF material compactly and evenly grows on the nanofiber membrane, and the MOF / nanofiber membrane is calcined under inert gas to form the metal-embedded nitrogen-doped porous carbon nanofibers. According to the preparation method, solvents such as methanol, ethanol and water are not used in the preparation process, and the method is short in preparation time, simple in process, environment-friendly and suitable for large-scale production and has important application value in the fields of energy catalysis and environmental protection.

Description

technical field [0001] The invention relates to the technical fields of nanomaterial preparation and fuel cell catalysis, in particular to a method for preparing a metal-salt-assisted rapid growth metal-organic framework derivative. Background technique [0002] The development of highly active non-precious metal-based catalysts to replace traditional expensive platinum-based catalysts is crucial and has been faced with numerous challenges. Studies have shown that high specific surface area, hierarchical pore structure, high active sites, uniform heteroatom doping, and high electrical conductivity are the key factors to obtain excellent electrocatalytic performance. Metal-organic frameworks (MOFs) with supramolecular structures, composed of metal ions and organic ligands, can be transformed into porous carbons with high specific surface area, high active sites, and uniform heteroatom decoration by simple carbonization in an inert atmosphere. Based on the above factors, elec...

Claims

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Application Information

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IPC IPC(8): H01M4/90D01F9/22D01F1/10D06M15/37C08G83/00D06M101/28
CPCH01M4/9008H01M4/9083D01F9/22D01F1/10D06M15/37C08G83/008D06M2101/28Y02E60/50
Inventor 张秀玲李从举彭利冲
Owner UNIV OF SCI & TECH BEIJING
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