A method for surface modification of metal-organic framework adsorption materials

A metal-organic framework and adsorption material technology, applied in the field of ambient air purification, can solve the problems of non-polar organic molecule adsorption performance decline, internal structure damage, etc., achieve high furnace temperature uniformity, prevent fugitive emissions, and facilitate operation Effect

Inactive Publication Date: 2016-08-17
TONGJI UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the shortcomings and deficiencies of the current technology and products, the present invention aims to solve the problem that the hydrophilicity of the metal clusters in the MOFs porous material leads to the decline of the adsorption performance of non-polar organic molecules and the destruction of the internal structure, and provides a metal organic framework Adsorption material surface modification method

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  • A method for surface modification of metal-organic framework adsorption materials
  • A method for surface modification of metal-organic framework adsorption materials
  • A method for surface modification of metal-organic framework adsorption materials

Examples

Experimental program
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Effect test

Embodiment 1

[0022] MOFs material: HKUST-1, adsorption gas: methane CH 4 .

[0023] A certain amount of synthesized HKUST-1 was taken as the MOFs material to be modified and placed in a tube furnace, and N 2 In order to ensure that there is no air residue inside, turn on the electric furnace for heating, so that the temperature in the tube furnace is at 140°C, and 2 A certain amount of pure pyridine was passed into the gas-to-tube furnace, and the constant temperature reaction was maintained at 140°C. The reaction time was 3 hours. The molar ratio of pure pyridine and copper content in MOFs was 1.5:1. 2 The mole percent in gas is 0.1%. After the MOFs reaction tube fumigated by pure pyridine was cooled to below 50 °C, N was introduced into the tube furnace. 2 , to ensure that the N in the tube furnace 2 The air pressure is 0.4MPa, the desorption flow rate is 500mL / min, and the desorption time is 1.5h. After the desorption is completed, the modified MOFs material is obtained and packag...

Embodiment 2

[0029] The improvement of the adsorption performance of modified MOFs materials to benzene under a certain humidity. The material of MOFs is MIL-101.

[0030] A certain amount of synthesized MIL-101 was taken as the MOFs material to be modified and placed in a tube furnace, and N 2 In order to ensure that there is no air residue inside, turn on the electric furnace for heating, so that the temperature in the tube furnace is at 140°C, and 2 A certain amount of pure pyridine was passed into the gas-to-tube furnace, and the constant temperature reaction was maintained at 140 ° C. The reaction time was 3 h. The molar ratio of chromium content in pure pyridine and MOFs was 1.5:1. 2 The molar percentage in gas is 0.5%. After the MOFs reaction tube fumigated by pure pyridine was cooled to below 50 °C, N was introduced into the tube furnace. 2 , to ensure that the N in the tube furnace 2 The air pressure is 0.4MPa, the desorption flow rate is 500mL / min, and the desorption time is ...

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Abstract

The invention relates to a surface modification method of a metal-organic framework adsorbing materials. Metal-organic framework porous adsorbing materials (MOFs) are subjected to chemical treatment in a plurality of steps, so that the adsorptive property on non-polar organic gas molecules in presence of water molecules can be improved. The preparation method of the materials comprises the following steps: firstly, putting to-be-modified MOFs into a tube furnace, and introducing nitrogen to ensure no residual air inside; introducing a certain amount of pure pyridine (C5H5N) into the tube furnace together with the N2, and reacting at certain temperature; cooling a reaction tube containing the MOFs to below 50 DEG C, and introducing N2 to the tube furnace; and after desorption is ended taking out and encapsulating the modified MOFs for later use. The metal-organic framework porous adsorbing materials are simple in modification process and high in operability; and the problems of adsorptive property degradation and internal structure damage of the non-polar organic gas molecules caused by hydrophilia of metallic clusters in MOFs porous materials can be solved by the MOFs prepared by the method.

Description

technical field [0001] The invention belongs to the field of ambient air purification, and in particular relates to a method for modifying the surface of a metal-organic framework adsorption material. Background technique [0002] Porous solid materials are one of the hot research fields of many chemists, physicists and materials scientists. These porous materials have potential applications in the fields of adsorption, separation, optical devices, biomedicine, purification, and catalysis. Metal-Organic Frameworks (MOFs) is a new type of porous material, which is a zeolite-like material with a periodic network structure formed by self-assembly of multi-dentate organic ligands containing oxygen and nitrogen and metal ions. Compared with traditional porous adsorption materials, these materials have many characteristics: (1) The specific surface area of ​​many MOFs materials exceeds that of traditional porous inorganic materials such as activated carbon, zeolite and porous org...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/30B01J20/22B01D53/02
CPCB01D53/02B01J20/226B01J20/3078B01J2220/44
Inventor 徐斌吴娅
Owner TONGJI UNIV
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