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Lithium-ion imprinted polyvinylidene fluoride (PVDF) membrane as well as preparation method and application of lithium-ion imprinted PVDF membrane

A lithium ion, imprinting technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as low selectivity, and achieve the effects of sensitive adsorption, excellent cyclic adsorption effect, and simple operation process.

Inactive Publication Date: 2017-11-14
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most adsorbents have no specific recognition ability and have low selectivity to single metals. Therefore, research and development have wide application range, high adsorption efficiency, easy regeneration, stable performance, low processing cost and specific recognition and separation capabilities. An important direction for the future development of adsorption and separation materials

Method used

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  • Lithium-ion imprinted polyvinylidene fluoride (PVDF) membrane as well as preparation method and application of lithium-ion imprinted PVDF membrane
  • Lithium-ion imprinted polyvinylidene fluoride (PVDF) membrane as well as preparation method and application of lithium-ion imprinted PVDF membrane
  • Lithium-ion imprinted polyvinylidene fluoride (PVDF) membrane as well as preparation method and application of lithium-ion imprinted PVDF membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1. Preparation of DA-modified PVDF membrane: Dissolve 0.1211g tris in 100mL deionized water, adjust pH=8.5, add 0.2g dopamine (DA), quickly add PVDF membrane, shake for 6.0h, wash with water Dry to obtain a dopamine-modified PVDF membrane.

[0032] Step 2. Preparation of SiO 2 -dPVDF membrane: Put the dPVDF membrane into a mixed solution of ethanol and water (10mL water and 40mL ethanol), add 2.0mL TEOS and 1.0mL NH 3 ·H 2 O, after stirring at room temperature, washing and drying to obtain SiO 2 Modified dPVDF(SiO 2 -dPVDF).

[0033] Step 3. Preparation of biomimetic multilayer KH-570-SiO 2 -dPVDF membrane: Then put the above membrane into a mixed solution (20mL of water and 60mL of ethanol), add 5.0mL of KH-570, stir at 80°C for 24h, wash the obtained membrane with ethanol and water, and dry it in vacuum.

[0034] Step 4. Add 0.2mmol 12-crown-4-ether and 0.2mmol lithium perchlorate to 40mL acetonitrile, and add KH-570-SiO 2 -dPVDF membrane, then add methacryl...

Embodiment 2

[0044] Step 1. Preparation of DA-modified PVDF membrane: Dissolve 0.1211g tris in 100mL deionized water, adjust pH=10, add 0.2g dopamine, quickly add PVDF membrane, shake for 6.0h, wash and dry, A dopamine-modified PVDF membrane was obtained.

[0045] Step 2. Preparation of SiO 2 -dPVDF membrane: Put the dPVDF membrane into a mixed solution of ethanol and water (10mL water and 50mL ethanol), add 4.0mL TEOS and 2.0mL NH 3 ·H 2 O, after stirring at room temperature, washing and drying to obtain SiO 2 Modified dPVDF(SiO 2 -dPVDF).

[0046] Step 3. Preparation of biomimetic multilayer KH-570-SiO 2 -dPVDF membrane: Then put the above membrane into a mixed solution (20mL of water and 60mL of ethanol), add 5.0mL of KH-570, stir at 80°C for 24h, wash the obtained membrane with ethanol and water, and dry it in vacuum.

[0047] Step 4. Add 0.2mmol 12 crown-4-ether and 0.2mmol lithium perchlorate to 50mL acetonitrile, and add KH-570-SiO 2 -dPVDF membrane, then add methacrylic acid...

Embodiment 3

[0049] Step 1. Prepare DA-modified PVDF membrane: Dissolve 0.1211g tris in 100mL deionized water, adjust pH=8.5, add 0.2g dopamine, quickly add PVDF membrane, shake for 6.0h, wash and dry, A dopamine-modified PVDF membrane was obtained.

[0050] Step 2. Preparation of SiO 2 -dPVDF membrane: Put the dPVDF membrane into a mixed solution of ethanol and water (10mL water and 40mL ethanol), add 3.0mL TEOS and 1.5mL NH 3 ·H 2 O, after stirring at room temperature, washing and drying to obtain SiO 2 Modified dPVDF(SiO 2 -dPVDF).

[0051] Step 3. Preparation of biomimetic multilayer KH-570-SiO 2 -dPVDFF membrane: Then put the above membrane into a mixed solution (20mL of water and 80mL of ethanol), add 7.0mL of KH-570, stir at 80°C for 24h, wash the obtained membrane with ethanol and water, and dry it in vacuum.

[0052] Step 4. Add 0.2mmol 12-crown-4-ether and 0.2mmol lithium perchlorate to 60mL acetonitrile, and add KH-570-SiO 2 -dPVDF membrane, then add methacrylic acid (1.2...

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Abstract

The invention relates to a preparation method of a bionic dopamine-modified lithium-ion imprinted polyvinylidene fluoride (PVDF) membrane and application of the bionic dopamine-modified lithium-ion imprinted PVDF membrane, belonging to the technical field of environmental function materials. Polyvinylidene fluoride (PVDF) is taken as a base membrane material, surface hydrophilic modification is carried out through dopamine, and a dopamine membrane is formed on the surface to improve the adhesivity and the hydrophilcity of the membrane material; the surface modification is carried out by using a silane coupling agent to further improve the performance of the membrane; and finally the bionic dopamine-modified lithium-ion imprinted PVDF membrane with high selectivity and good adsorption property is prepared through an imprinting polymerization process. The preparation method has a relatively good application prospect.

Description

technical field [0001] The invention relates to a preparation method and application of a bionic dopamine-modified lithium ion imprinted PVDF membrane, which belongs to the technical field of preparation of environmental functional materials. Background technique [0002] In recent years, with the rapid economic development and social progress, environmental pollution has attracted widespread attention. With the advancement of science and technology and the popularization of electronic equipment, the pollution of waste batteries has become more and more serious. Lithium batteries are currently the mainstream products in the battery industry. Since 2006, lithium batteries have maintained an annual growth rate of 14.5%. The use of lithium batteries has attracted more and more attention. Waste lithium batteries contain a large amount of metals and electrolyte solutions such as waste acid and alkali, which have been exposed to the ground or buried underground for a long time. Th...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30B01D71/34B01D67/00
CPCB01J20/268B01D67/0002B01D71/34B01J20/28033
Inventor 张宇锋戴江栋崔久云刘思玮李春香闫永胜周志平
Owner JIANGSU UNIV
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