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Organic ligand for MOF (Metal Organic Framework) and preparation method of organic ligand as well as separation membrane containing organic ligand MOF and preparation method of separation membrane

An organic ligand, separation membrane technology, applied in osmosis/dialysis water/sewage treatment, seawater treatment, etc., can solve problems such as difficulty in applicability, improve chemical stability, improve transmission, and offset ion flux reduced effect

Active Publication Date: 2018-02-23
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the application of existing MOF materials in ion separation is only in the initial stage of exploration, not only in terms of applicability, but also in its own characteristics, such as the size controllability of the MOF framework, charging, stability and MOF layer. Thickness controllability and recyclability need to be studied in depth, especially the important ion-selective separation function in the practical process has yet to be explored

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  • Organic ligand for MOF (Metal Organic Framework) and preparation method of organic ligand as well as separation membrane containing organic ligand MOF and preparation method of separation membrane
  • Organic ligand for MOF (Metal Organic Framework) and preparation method of organic ligand as well as separation membrane containing organic ligand MOF and preparation method of separation membrane
  • Organic ligand for MOF (Metal Organic Framework) and preparation method of organic ligand as well as separation membrane containing organic ligand MOF and preparation method of separation membrane

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preparation example Construction

[0067] The invention provides a method for preparing an organic ligand for MOF, comprising the following steps:

[0068] 1) after mixing terephthalic acid diester, bromo-1-alkene, acid-binding agent and the first solvent, carry out condensation reaction, obtain the monomer containing double bond;

[0069] 2) Under the action of a catalyst, after the double bond-containing intermediate obtained in the above steps is polymerized in a second solvent, a polymer containing a terephthalic acid diester structure is obtained;

[0070] 3) The polymer containing the terephthalic acid diester structure obtained in the above steps and the base are hydrolyzed in a third solvent, and then reacted with an acidic substance to obtain an organic ligand for the MOF.

[0071] In the invention, firstly, after mixing terephthalic acid diester, bromo-1-alkene, acid-binding agent and the first solvent, condensation reaction is carried out to obtain monomers containing double bonds.

[0072] The pres...

Embodiment 1

[0133] 1.1 Preparation of polymeric organic ligands containing terephthalic acid structure

[0134] 3.2mmol of diethyl terephthalate, 12.0mmol of 7-bromo-1-alkene and 16.0mmol of potassium carbonate were dissolved in 24ml of N,N-dimethylformamide, and the solution was reacted at 90°C After 24 hours, potassium carbonate was filtered off, and N,N-dimethylformamide was evaporated to obtain monomer (1).

[0135] 0.3mmol of monomer (1) and 0.032mmol of the second-generation Grubbs catalyst were dissolved in 6ml of methylene chloride, and this solution was reacted at 40°C for 8h, and it was precipitated in 30ml of methanol, and the solid was dried to obtain a polymer ( 2).

[0136] Dissolve 0.3mmol of polymer (2) and 4.5mmol of potassium hydroxide in 10ml of dimethyl sulfoxide, react at 90°C for 12h until the solution is clear, then add 2M HCl dropwise until the pH of the solution is 1, and then dissolve the resulting The solid was repeatedly washed with 30 ml of methanol and 30 m...

Embodiment 2

[0146]2.1 Preparation of polymeric organic ligands containing terephthalic acid structure

[0147] 3.2mmol of diethyl terephthalate, 12.8mmol of 8-bromo-1-alkene and 16.0mmol of potassium carbonate were dissolved in 24ml of N,N-dimethylformamide, and the solution was reacted at 80°C After 26 hours, potassium carbonate was filtered off, and N,N-dimethylformamide was evaporated to obtain monomer (1).

[0148] The first generation Grubbs catalyst of 0.3mmol monomer (1) and 0.034mmol was dissolved in 6ml methylene chloride, and this solution was reacted at 35°C for 7h, and it was precipitated in 30ml methanol, and the solid was dried to obtain polymer (2 ).

[0149] Dissolve 0.3mmol of polymer (2) and 4.5mmol of potassium hydroxide in 10ml of dimethyl sulfoxide, react at 100°C for 10h until the solution is clear, then add 2M HCl dropwise until the pH of the solution is 1, and then dissolve the resulting The solid was repeatedly washed with 30 ml of methanol and 30 ml of acetone ...

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Abstract

The invention provides an organic ligand for an MOF (Metal Organic Framework). The organic ligand has a structure as shown in a formula (I), wherein x ranges from 7 to 10, and n ranges from 20 to 30.The invention provides the organic ligand MOF; ligand metal in the organic ligand MOF is iron. The invention also provides the separating membrane containing the organic ligand MOF; the separating membrane comprises a basement membrane and the organic ligand MOF compounded on the surface of the basement membrane. According to the organic ligand and the separating membrane disclosed by the invention, a specific chemical structure of the organic ligand is selected from regulation and control over the aperture size of the MOF; the specific chemical structure is combined with a specific ligand metal and the influence of a growing environment of the MOF and a substrate structure, so that selective separation of ions is researched, and the size of the MOF is accurately regulated and controlled;the selective separation of the ions is realized on the basis of a screening action of aperture, so that the selective adsorption separation in a polyvalent ion solution system is better realized.

Description

technical field [0001] The invention relates to the technical field of metal-organic framework compound nanomaterials, to an organic ligand and its preparation method, an organic ligand MOF, a separation membrane and its preparation method, and in particular to an organic ligand and its preparation method for MOF. Its preparation method, organic ligand MOF, a separation membrane containing organic ligand MOF and its preparation method. Background technique [0002] Metal-organic framework complexes (Metal-Organic Frameworks), referred to as MOFs, usually refer to metal ions or metal clusters and organic ligands through a self-assembly process to form a crystalline material with a periodic infinite network structure, which combines organic-inorganic heterogeneity. The order and controllability of chemical properties and crystal structure, microporosity, special optical, electrical, magnetic properties and potential applications in industry make it one of the hot research fiel...

Claims

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Application Information

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IPC IPC(8): C08G83/00C02F1/44C02F103/08
CPCC02F1/44C02F2103/08C08G83/008
Inventor 徐铜文伍斌葛亮王鑫徐婷婷
Owner UNIV OF SCI & TECH OF CHINA
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