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Preparation method of lithium ion imprinted composite nanofiber membrane based on MOFs (Metal-Organic Frameworks)

A technology of composite nanofibers and nanofiber membranes, which is applied in the field of MOFs and ion imprinting technology, can solve the problems of inability to achieve high-selectivity removal of target pollutants, large environmental impact, poor adsorption effect, etc., and achieve multiple recognition sites and high The effect of selectivity, easy pore structure, and high porosity

Active Publication Date: 2022-07-29
NORTHEAST DIANLI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of using a large amount of dangerous organic solvents in the existing method of loading MOFs on nanofibers, which has high cost, great impact on the environment, poor adsorption effect, and cannot achieve highly selective removal of target pollutants in complex systems. problem, and provide a preparation method of lithium ion imprinted composite nanofiber membrane based on MOFs

Method used

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  • Preparation method of lithium ion imprinted composite nanofiber membrane based on MOFs (Metal-Organic Frameworks)
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  • Preparation method of lithium ion imprinted composite nanofiber membrane based on MOFs (Metal-Organic Frameworks)

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specific Embodiment approach 1

[0030] Embodiment 1: In this embodiment, a method for preparing a lithium ion imprinted composite nanofiber membrane based on MOFs is developed, and a highly selective Li with enhanced hydrophilicity and stability is developed. + Imprinted polymers (MOFs-LiIIPs). with high selectivity for Li + The imprinted polymer was used as the imprinted layer to prepare a new composite material; 12-crown-4 (12C4) was used as the adsorption unit to form a selective Li + Identify sites and prepare films by electrospinning techniques. It includes the following steps:

[0031] 1. Preparation of highly selective Li + Imprinted polymers:

[0032] ①. Mix LiCl, 12-crown ether-4 and anhydrous methanol, then put them into a constant temperature heating magnetic stirrer for pre-polymerization, and then add NH 2 - The UIO-66 zirconium-based organometallic framework is shaken, then α-methacrylic acid and azobisisobutyl cyanide are added, and then shaken under the conditions of nitrogen atmosphere,...

specific Embodiment approach 2

[0040] Embodiment 2: The difference between this embodiment and Embodiment 1 is: the NH described in step 1 2 -UIO-66 zirconium-based organometallic framework was prepared as follows: First, 1 mmol of ZrCl was dissolved in 50 mL of DMF 4 and 1 mmol of 2-aminoterephthalic acid, stirred at room temperature for 0.5 h to obtain a mixed solution; then poured the mixed solution into a polytetrafluoroethylene hydrothermal kettle, and reacted at 120 ° C for 24 h, the resulting suspension ; After cooling and centrifugation, solid matter is obtained, and the solid matter is washed with absolute ethanol and deionized water respectively, and finally, yellow powder is obtained through drying and grinding, which is NH 2 -UIO-66 zirconium based organometallic framework. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0041] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is: the mass ratio of LiCl described in step 1 ① to the volume ratio of anhydrous methanol is 0.3g:100mL; step 1 described in step 1 ① The volume ratio of 12-crown-4 to anhydrous methanol was 0.3:100. Other steps are the same as in the first or second embodiment.

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Abstract

The invention discloses a preparation method of a lithium ion imprinting composite nanofiber membrane based on MOFs (Metal-Organic Frameworks), relates to the field of ion imprinting membrane preparation methods, and in particular relates to a method for combining MOFs and an ion imprinting technology. The invention aims to solve the problems that a large amount of dangerous organic solvents are used, the cost is high, the influence on the environment is great, the adsorption effect is poor, and high-selectivity removal of target pollutants in a complex system cannot be realized in the conventional method for loading MOFs on nanofibers. The method comprises the following steps: 1, preparing a high-selectivity Li < + > imprinted polymer; 2, preparing a polyacrylonitrile nanofiber membrane; and 3, preparing the MOFs-Li < II > Ps (at) PAN by a hydrothermal method, so as to obtain the lithium ion imprinted composite nanofiber membrane based on the MOFs. The lithium ion imprinted composite nanofiber membrane based on the MOFs prepared by the preparation method disclosed by the invention has the advantage that the adsorption capacity of the lithium ion is as high as 99.99%. The lithium ion imprinted composite nanofiber membrane based on the MOFs can be obtained by the preparation method disclosed by the invention.

Description

technical field [0001] The invention relates to the field of methods for preparing ion imprinting membranes, in particular to a method for combining MOFs and ion imprinting technology. Background technique [0002] Metal-organic frameworks (MOFs) are a class of inorganic-organic hybrid porous materials that are self-assembled by metal ions and bridging ligands under the coordination effect. Compared with traditional porous materials (such as activated carbon, zeolite, molecular sieves, etc.), MOFs have the advantages of large specific surface area, high porosity, and easily adjustable pore structure, and are widely used in adsorption separation, catalysis, drug loading and drug control. release and other fields. In recent years, microporous MOFs have been widely used in the adsorption and separation of small gas molecules. Based on the rich framework structure of MOFs, the selective adsorption of target compounds can also be achieved by modifying organic ligands with speci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30
CPCB01J20/268B01J20/226B01J20/28038
Inventor 李正刘禹霄
Owner NORTHEAST DIANLI UNIVERSITY
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