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Nanocellulose layer-by-layer self-assembled membrane and preparation method thereof

A nanocellulose, layer-by-layer self-assembly technology, applied in the field of membrane separation, can solve the problems of easy contamination, insufficient rigidity of nanofiltration membrane, low permeation flux and stability, etc., and achieve simple and efficient preparation process and adjustable separation pore size control, excellent permeability effect

Pending Publication Date: 2021-12-03
浙大宁波理工学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although the electrostatic layer-by-layer self-assembly method has made great progress in the construction of high-performance nanofiltration membranes in recent years, it still faces the following major challenges: limited by the traditional flexible polyelectrolyte materials, the rigidity of nanofiltration membranes is insufficient and the porosity is low , has low permeation flux and stability; the surface of the membrane material is not hydrophilic enough, and there is a problem that it is easy to be polluted; most membrane materials come from non-renewable fossil resources, which limits its further development and application

Method used

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  • Nanocellulose layer-by-layer self-assembled membrane and preparation method thereof
  • Nanocellulose layer-by-layer self-assembled membrane and preparation method thereof
  • Nanocellulose layer-by-layer self-assembled membrane and preparation method thereof

Examples

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Embodiment 1

[0027] S1. Prepare a 5cm×5cm hydrolyzed polyacrylonitrile ultrafiltration base membrane;

[0028] S2. Soak the polyacrylonitrile ultrafiltration membrane in 100 mL of quaternary ammonium cellulose nanofiber (charge amount 1.0 mmol / g) aqueous solution with a concentration of 0.01% and a pH of 7.0 for 10 minutes, take out the membrane and rinse it with deionized water to remove Unbound quaternary ammonium cellulose nanofibers on the membrane surface;

[0029] S3, then immerse the membrane in 100 mL of TEMPO-cellulose nanofiber (charge amount 1.0 mmol / g) aqueous solution with a concentration of 0.01% and a pH of 7.0 for 10 min, and complete the assembly process of the first double layer under the drive of electrostatic force , the membrane is taken out and rinsed with deionized water to remove unbound TEMPO-cellulose nanofibers on the membrane surface;

[0030] S4. Repeat steps S2-S3 once to obtain a nanocellulose self-assembled separation membrane layer by layer.

Embodiment 2

[0032] S1. Prepare a 5cm×5cm hydrolyzed polyacrylonitrile ultrafiltration base membrane;

[0033] S2. Soak the polyacrylonitrile ultrafiltration membrane in 100 mL of quaternary ammonium cellulose nanofiber (charge amount 1.0 mmol / g) aqueous solution with a concentration of 0.01% and a pH of 7.0 for 10 minutes, take out the membrane and rinse it with deionized water to remove Unbound quaternary ammonium cellulose nanofibers on the membrane surface;

[0034] S3, then immerse the membrane in 100 mL of TEMPO-cellulose nanofiber (charge amount 1.0 mmol / g) aqueous solution with a concentration of 0.01% and a pH of 7.0 for 10 min, and complete the assembly process of the first double layer under the drive of electrostatic force , the membrane is taken out and rinsed with deionized water to remove unbound TEMPO-cellulose nanofibers on the membrane surface;

[0035] S4. Repeat steps S2-S3 twice to obtain a nanocellulose self-assembled separation membrane layer by layer.

Embodiment 3

[0037] S1. Prepare a 5cm×5cm hydrolyzed polyacrylonitrile ultrafiltration base membrane;

[0038] S2. Soak the polyacrylonitrile ultrafiltration membrane in 100 mL of quaternary ammonium cellulose nanofiber (charge amount 1.0 mmol / g) aqueous solution with a concentration of 0.01% and a pH of 7.0 for 10 minutes, take out the membrane and rinse it with deionized water to remove Unbound quaternary ammonium cellulose nanofibers on the membrane surface;

[0039] S3, then immerse the membrane in 100 mL of TEMPO-cellulose nanofiber (charge amount 1.0 mmol / g) aqueous solution with a concentration of 0.01% and a pH of 7.0 for 10 min, and complete the assembly process of the first double layer under the drive of electrostatic force , the membrane is taken out and rinsed with deionized water to remove unbound TEMPO-cellulose nanofibers on the membrane surface;

[0040] S4. Steps S2-S3 were repeated three times to obtain a nanocellulose self-assembled separation membrane layer by layer. ...

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Abstract

The invention belongs to the technical field of membrane separation, and relates to a nanocellulose layer-by-layer self-assembled membrane and a preparation method thereof. Compared with a traditional polyelectrolyte layer-by-layer self-assembled membrane, the nanocellulose membrane material with a rigid separation layer, high porosity and a super-hydrophilic surface is constructed by taking nano-crystalline cellulose as a membrane preparation element through a layer-by-layer self-assembly method, so that the preparation of a nanofiltration membrane with excellent permeability, pollution resistance and long-term stability is facilitated, and the high performance of the nanofiltration membrane is realized.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and relates to a nanocellulose layer-by-layer self-assembled membrane and a preparation method thereof. Background technique [0002] Separation and purification is a process of selectively separating substances from a mixed system, which plays a pivotal role in chemical research and chemical production. Membrane separation, as an efficient, environmentally friendly and energy-saving separation technology, can achieve selective permeation separation of substances at the molecular level, and is widely used in biomedicine, battery separators, food processing, gas separation, water treatment, chemical industry and other fields. Nanofiltration membrane is an important branch of separation membrane. It has a nanoscale separation pore size (0.5-2.0nm), has the advantages of low operating pressure, large flux, high efficiency, and simple operation. It is used in hard water softening, organic...

Claims

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Application Information

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IPC IPC(8): B01D69/02B01D69/08B01D69/12B01D67/00
CPCB01D69/02B01D69/08B01D69/081B01D67/0088B01D69/12B01D67/0081B01D2323/46
Inventor 王章慧夏道伟
Owner 浙大宁波理工学院
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