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Preparation method and application of lithium-ion-imprinted polyethersulfone composite membrane

A polyethersulfone membrane and lithium ion technology, which is applied in the field of preparation of lithium ion imprinted polyethersulfone composite membrane, can solve the problem of inability to achieve efficient separation of lithium ions, and achieve a remarkable separation effect, improved identification efficiency, and strong regeneration. Effect

Active Publication Date: 2017-06-30
JILIN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the separation of lithium extraction from salt lakes has been extensively studied on methods such as solvent extraction, salting out, ion exchange, precipitation and nanofiltration, due to the lithium ion (Li + ) and sodium ions (Na + ) and potassium ions (K + ) are similar in properties and ionic radii, making it still impossible to achieve efficient separation of lithium ions in salt lake brine

Method used

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  • Preparation method and application of lithium-ion-imprinted polyethersulfone composite membrane
  • Preparation method and application of lithium-ion-imprinted polyethersulfone composite membrane
  • Preparation method and application of lithium-ion-imprinted polyethersulfone composite membrane

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Experimental program
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Effect test

Embodiment 1

[0046] Step 1. Dopamine modification on the surface of polyethersulfone membrane

[0047] First, 0.1211g tris(hydroxymethyl)aminomethane hydrochloride (Tris) and 0.2g dopamine hydrochloride (DA) were placed in 100mL deionized water, mixed uniformly under ultrasonic conditions, and the pH value of the mixed solution was adjusted to 8.5, and 3 A piece of polyethersulfone membrane PSMs was immersed in the mixed solution, and reacted for 3 hours under shaking at room temperature. The membrane obtained after the reaction was taken out, soaked and washed with deionized water three times, each time for 10 minutes, and dried at room temperature. , dopamine-modified polyethersulfone membranes (dPSMs).

[0048] Step 2, preparation of silica nanocomposite film

[0049] First, 1 mL of tetraethyl silicate (TEOS) was added to a mixed solution of 35 mL of ethanol and water (ethanol: water = 30 mL: 5 mL), and mixed uniformly under ultrasonic conditions. After the polyethersulfone membrane d...

Embodiment 2

[0066] Step 1. Dopamine modification on the surface of polyethersulfone membrane

[0067] First, 0.1211g tris(hydroxymethyl)aminomethane hydrochloride (Tris) and 0.2g dopamine hydrochloride (DA) were placed in 100mL deionized water, mixed uniformly under ultrasonic conditions, and the pH value of the mixed solution was adjusted to 8.5, and 3 A piece of polyethersulfone membrane PSMs was immersed in the mixed solution, and reacted at room temperature for 6 hours. The membrane obtained after the reaction was taken out, soaked and washed with deionized water three times, each time for 10 minutes, and the washed membrane was dried at room temperature. , dopamine-modified polyethersulfone membranes (dPSMs).

[0068] Step 2, preparation of silica nanocomposite film

[0069] First, 1 mL of tetraethyl silicate (TEOS) was added to a mixed solution of 35 mL of ethanol and water (ethanol: water = 30 mL: 5 mL), and mixed uniformly under ultrasonic conditions. After the polyethersulfone ...

Embodiment 3

[0086] Step 1. Dopamine modification on the surface of polyethersulfone membrane

[0087] First, 0.1211g tris(hydroxymethyl)aminomethane hydrochloride (Tris) and 0.2g dopamine hydrochloride (DA) were placed in 100mL deionized water, mixed uniformly under ultrasonic conditions, and the pH value of the mixed solution was adjusted to 8.5, and 3 A piece of polyethersulfone membrane PSMs was immersed in the mixed solution, and reacted at room temperature for 9 hours. The membrane obtained after the reaction was taken out, soaked and washed with deionized water three times, each time for 10 minutes, and the washed membrane was dried at room temperature. , dopamine-modified polyethersulfone membranes (dPSMs).

[0088] Step 2, preparation of silica nanocomposite film

[0089] First, 1 mL of tetraethyl silicate (TEOS) was added to a mixed solution of 35 mL of ethanol and water (ethanol: water = 30 mL: 5 mL), and mixed uniformly under ultrasonic conditions. After the polyethersulfone ...

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Abstract

The invention provides a preparation method and application of a lithium-ion-imprinted polyethersulfone composite membrane, belonging to the technical field of preparation of functional materials. The lithium-ion-imprinted polyethersulfone composite membrane is prepared with a polyethersulfone membrane as a substrate membrane material, lithium ions as a template, 12-crown-4-ether as a binding site, methacrylic acid as a functional monomer, ethylene glycol dimethacrylate as a cross-linking agent and azodiisobutyronitrile as an initiator by using a combination of dopamine surface modification technology, silica nanometer compounding technology and imprinted polymerization technology. Static adsorption experiments are conducted to research the adsorption equilibrium, kinetic performance and selective recognition performance of the prepared lithium-ion-imprinted polyethersulfone composite membrane; and selective permeation experiments are carried out to research the permeation action of the prepared lithium-ion-imprinted polyethersulfone composite membrane on target ions (lithium ions) and non-target ions (sodium ions and potassium ions). The lithium-ion-imprinted polyethersulfone composite membrane prepared in the invention has high specific lithium ion adsorption capability and lithium ion recognition and separation capability.

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 lithium ion imprinted polyethersulfone composite membrane for selectively identifying and separating lithium ions in a mixed system. Background technique [0002] Membrane separation technology (MST) is a separation technology that has received more attention in recent years. It refers specifically to the molecular level. A technique of separation. Compared with traditional separation methods such as distillation and extraction, the membrane separation process has many advantages such as less loss of active ingredients, low energy consumption, no secondary pollution to the separated substances, strong adaptability, simple process, convenient operation, and easy automation. However, for the separation process at the ionic level, traditional microfiltration membranes, nanofiltration membranes, etc. l...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D69/12B01D67/00B01J20/26B01J20/30
CPCB01D67/0079B01D69/12B01D71/68B01J20/268
Inventor 姜大雨卢健秦莹莹闫永胜王良
Owner JILIN NORMAL UNIV
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