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Preparation method and application of Li-IIMs ion imprinted membrane

A technology of ion imprinting and dimethoxysilane membrane, applied in the direction of ion exchange, ion exchange regeneration, chemical instruments and methods, etc., can solve the problems of easy loss of ion imprinting membrane ligands, low reuse rate, low adsorption capacity, etc. Achieve the effect of facilitating subsequent separation, solving difficult recycling, and high throughput

Active Publication Date: 2020-06-05
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the purpose of the present invention is to overcome the technical defects existing in the prior art, solve the problems of traditional ion imprinted membranes such as easy loss of ligands, low reuse rate, low adsorption capacity, etc., and greatly improve the separation efficiency of target ions lithium ions

Method used

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  • Preparation method and application of Li-IIMs ion imprinted membrane
  • Preparation method and application of Li-IIMs ion imprinted membrane
  • Preparation method and application of Li-IIMs ion imprinted membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0040] (1) Preparation of polydimethylsiloxane membrane:

[0041]Put 2 g of polydimethylsiloxane in a petri dish to coat evenly, add 0.2 g of curing agent B in 184 silicone rubber and stir to form a mixture, put edible sugar cubes on the surface of the mixture, and vacuum pump at room temperature Filtrate the mixture for 6 hours to filter the mixture into the cube sugar, and dry it in an oven at 65°C for 6 hours; immerse it in a water bath to solidify, change the water every 6 hours, and dry it at 40°C after three times to obtain a polydimethoxysilane film;

[0042] (2) Polydopamine modification of polydimethoxysilane membrane:

[0043] Dissolve 0.1211 g of Tris in 100 mL of deionized water, and quickly adjust the pH to 8.5 to obtain Tris solution; take another part of Tris solution and add 0.2 g of dopamine to Dopamine solution; The polydimethoxysilane membrane prepared in step (1) was pretreated by immersing in tris solution for 5 minutes, then soaked in dopamine solution, ...

Embodiment 2

[0054] (1) Preparation of polydimethylsiloxane membrane:

[0055] Put 2 g of polydimethylsiloxane in a petri dish to coat evenly, add 0.2 g of curing agent B in 184 silicone rubber and stir to form a mixture, put edible sugar cubes on the surface of the mixture, and vacuum pump at room temperature Filter for 8 hours, suction filter the mixture into the sugar cube, dry in an oven at 60°C for 10 hours, immerse in a water bath to solidify, change the water every 6 hours, dry at 45°C after 3 times of water to obtain a polydimethoxysilane film ;

[0056] (2) Polydopamine modification of polydimethoxysilane membrane:

[0057] The polydimethoxysilane membrane prepared in step (1) was pretreated by immersing in tris solution for 3 minutes, then immersed in dopamine solution, shaken at room temperature for 24 hours, washed with ethanol and water, and then dried at 40°C to obtain Polydimethoxysilane film modified by polydopamine;

[0058] (3) Carboxylation of polydimethoxysilane film...

Embodiment 3

[0065] (1) Preparation of polydimethylsiloxane membrane:

[0066] Put 2 g of polydimethylsiloxane in a petri dish to coat evenly, add 0.5 g of curing agent B in 184 silicone rubber and stir to form a mixture, put edible sugar cubes on the surface of the mixture, and vacuum it at room temperature Filter for 10 hours, suction filter the mixture into the sugar cube, dry in an oven at 55°C for 12 hours, immerse in a water bath to solidify, change the water every 6 hours, and dry at 35°C after 3 times to obtain a polydimethoxysilane film;

[0067] (2) Polydopamine modification of polydimethoxysilane membrane:

[0068] The polydimethoxysilane membrane prepared in step (1) was pretreated by immersing in tris solution for 6 minutes, then immersed in dopamine solution, shaken at room temperature for 36 hours, washed with ethanol and water, and then dried at 40°C to obtain Polydimethoxysilane film modified by polydopamine;

[0069] (3) Carboxylation of polydimethoxysilane film:

[00...

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Abstract

The invention belongs to the technical field of functional material preparation, and particularly relates to a preparation method and application of a Li-IIMs ion imprinted membrane. According to thepreparation method, polydimethylsiloxane is modified through a self-polymerization reaction of dopamine to form a highly viscous dopamine layer, succinic anhydride is hydrolyzed to form carboxyl on the surface of a dopamine functionalized substrate, and carboxyl-modified PDMS is further modified to construct ester-modified PDMS; furthermore, calix[4]arene is used as a ligand, ethylenediaminetetraacetic acid is used as an eluent, and the Li-IIMs imprinted membrane is prepared. Compared with a preparation method of a traditional membrane material, the imprinted membrane prepared by the disclosedmethod has the advantages of easiness in recovery, convenience in subsequent separation, no secondary pollution to separated substances and the like, and the defects of difficulty in recovery, easiness in secondary pollution generation and the like of an existing lithium ion separation polymer are well overcome.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional materials, and in particular relates to a preparation method and application of a Li-IIMs ion imprinted membrane. Background technique [0002] Lithium is gaining a lot of attention in recent decades due to its widespread use in Li-ion battery reactor control as well as in the energy industry. With the increase of lithium demand, researchers are committed to finding a large source of lithium, such as extracting lithium ions (Li + ). Various extraction methods (solar evaporation, solvent extraction, and chemical precipitation) have been applied to extract Li + . However, these methods are still far from satisfactory due to similar ionic radii and properties at extremely low concentrations compared with other competing ions. Therefore, to find a highly selective Li + Separation and recovery technologies are critical. [0003] Ion imprinting technique (IIT) has attracted much ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30B01D15/08C02F1/28C08J7/12C08J7/14C08J7/16C08J5/18C08L83/04C02F101/10C02F103/08
CPCB01J20/268B01J20/28033B01D15/08C02F1/285C08J7/12C08J7/14C08J7/16C08J5/18C02F2103/08C02F2101/10C08J2383/04C08J2483/04Y02P10/20
Inventor 于超卢健董泽青马中飞吴易霖
Owner JIANGSU UNIV
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