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Polyamide composite nanofiltration membrane based on modification of PDA/SiO2 supporting layer as well as preparation method and application of polyamide composite nanofiltration membrane

A composite nanofiltration membrane and supporting layer technology, applied in chemical instruments and methods, water/sludge/sewage treatment, permeation/dialysis water/sewage treatment, etc. Enhanced hydrophilicity and stable retention of salts

Active Publication Date: 2021-12-17
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Nanofiltration technology inevitably faces a trade-off between permeability and selectivity during operation, which limits its popularization and application to a large extent.

Method used

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  • Polyamide composite nanofiltration membrane based on modification of PDA/SiO2 supporting layer as well as preparation method and application of polyamide composite nanofiltration membrane
  • Polyamide composite nanofiltration membrane based on modification of PDA/SiO2 supporting layer as well as preparation method and application of polyamide composite nanofiltration membrane
  • Polyamide composite nanofiltration membrane based on modification of PDA/SiO2 supporting layer as well as preparation method and application of polyamide composite nanofiltration membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This embodiment is to prepare unmodified original PMIA substrate by non-solvent-induced phase inversion (NIPS) method, and specific process is as follows:

[0040] First, 4.5 g LiCl and 1.0 g PVP were added to 83.5 g DMAc solvent, and stirred at 25 °C until a homogeneous solution was obtained; then, 11.0 g PMIA fibers were added to the above homogeneous solution, and stirred at 85 °C Keep it in a constant temperature oil bath for about 6 hours, while stirring at 500rpm to obtain a homogeneous polymer coating solution (casting solution), cool the casting solution to 25°C for defoaming, and finally prepare the PMIA substrate by phase inversion method , recorded as M-0.

[0041] Among them, the specific preparation process of the phase inversion method is: apply the casting solution on the non-woven fabric at 25 ° C, with a thickness of 150 μm, and after staying in the air for 30 seconds, immediately transfer the new film to a temperature of 30 ° C. Phase inversion was pe...

Embodiment 2

[0043] This embodiment is to prepare the PDA / SiO with the PMIA substrate M-0 that embodiment 1 makes 2 The PMIA base film of the support layer, the specific process is as follows:

[0044] First, 20mg SiO 2 (average particle size 20nm) was dissolved in 200mL Tris-HCl buffer solution (10mM, pH=8.5), stirred at 25°C for 5 minutes, then ultrasonically stirred for 30 minutes, and then stirred again for 1 hour. Next, 400mgPDA was added to the homogeneously dispersed SiO 2 solution, and then stirred at 25 °C in the dark for 5 min to obtain the PDA / SiO 2 Mixture. The PMIA substrate was fixed in a self-made airtight container, and then the PDA / SiO 2 The mixture was poured into a closed container and coated on the surface of the PMIA substrate, and the container was shaken at a speed of 130r / min on the oscillator for 20min. Finally, the film was soaked in deionized water for further use, and the obtained film product was marked for M-1.

Embodiment 3

[0046] This embodiment is also prepared with PDA / SiO with the PMIA substrate M-0 that embodiment 1 makes 2 The PMIA base film of support layer, preparation method is basically the same as embodiment 2, specifically as follows:

[0047] First, 20mg SiO 2 (average particle size 30nm) was dissolved in 200mL Tris-HCl buffer solution (10mM, pH=8.5), stirred at 800rpm at 25°C for 8 minutes, then ultrasonically stirred for 40 minutes, and then stirred again for 1 hour. Next, 400 mg PDA was added to the homogeneously dispersed SiO 2 solution, and then stirred at 30 °C in the dark for 5 min to obtain PDA / SiO 2 Mixture. The PMIA substrate was fixed in a self-made airtight container, and then the PDA / SiO 2 The mixture was poured into a closed container and coated on the surface of the PMIA substrate, and the container was shaken at a speed of 100r / min on the oscillator for 40min. Finally, the film was soaked in deionized water for further use, and the obtained film product was marked...

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Abstract

The invention discloses a high-performance polyamide composite nanofiltration membrane based on a PDA / SiO2 supporting layer as well as a preparation method and application of the high-performance polyamide composite nanofiltration membrane. The preparation method comprises the steps of firstly, preparing a PMIA substrate through a phase inversion method, then preparing a PMIA base membrane with the PDA / SiO2 supporting layer, and finally preparing the polyamide composite nanofiltration membrane through an interfacial polycondensation reaction. The surface of the prepared NF membrane is evolved into a uniform tubular bedding accumulation structure from a sparse ridge shape, a PA epidermal layer is thinned, an internal pore channel structure is kept well, and the NF membrane has ultrahigh permeability as high as 31.37 L.m <-2 >. h <-1 >. bar <-1 >. Meanwhile, the membrane product shows relatively excellent monovalent / divalent salt separation characteristics, has good structural stability and performance stability, has good application prospects in specific water treatment industries, and can ensure an efficient and lasting separation process during long-time operation.

Description

technical field [0001] The invention relates to a nanofiltration membrane, in particular to a PDA / SiO-based 2 The invention relates to a polyamide composite nanofiltration membrane modified by a support layer, a preparation method and an application thereof; it belongs to the technical field of new membrane materials. Background technique [0002] With the increasing shortage of water resources and environmental pollution, the ecological environment and human health are threatened. Therefore, people have invested a lot of research on water treatment technology, and green and efficient membrane separation technology is the core of water treatment technology. Among them, the polymer membrane has played a huge role in water treatment due to its advantages of high efficiency and environmental protection, especially the nanofiltration membrane (NF) with a molecular weight between 200Da and 2000Da has excellent performance and has been used in water separation and purification, s...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D67/00B01D69/02B01D69/10B01D69/12B01D71/56C02F1/44
CPCB01D61/027B01D69/12B01D71/56B01D69/105B01D69/02B01D67/0002B01D67/0009C02F1/442B01D2325/36
Inventor 王涛王亚君赵珍珍郑喜张璐瑶
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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