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High-performance forward permeable membrane and electrostatic spinning preparation method thereof

A forward osmosis membrane, high-performance technology, applied in the field of membrane separation, can solve the problems of unsatisfactory salt cutoff rate of forward osmosis membrane, complex hydrophilic and hydrophobic interpenetrating nanofiber method, etc., to achieve hydrophilic improvement, increase water flux and The effect of salt cutoff and simple preparation process

Inactive Publication Date: 2016-07-06
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN103768959A introduces a forward osmosis membrane supported by hydrophilic-hydrophobic intertransfer network nanofibers. Researchers hope to improve the hydrophilicity of the membrane by interspersing hydrophilic nanofibers in hydrophobic nanofibers and reduce internal concentration polarization; although The hydrophilicity of the support layer is improved, but the method of preparing hydrophilic-hydrophobic interpenetrating nanofibers is complicated, and the salt cut-off rate of the forward osmosis membrane is not ideal

Method used

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  • High-performance forward permeable membrane and electrostatic spinning preparation method thereof
  • High-performance forward permeable membrane and electrostatic spinning preparation method thereof
  • High-performance forward permeable membrane and electrostatic spinning preparation method thereof

Examples

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Effect test

Embodiment 1

[0027] Dissolve 0.05g carbon nanotubes in a mixed solvent of 10g N-N dimethylformamide (DMF) and NN dimethylacetamide (DMAc) (DMF: DMAc=1:1), and configure a carbon concentration of 0.5% Nanotube solution: Dissolve 1g of polyacrylonitrile (PAN) in the above mixed solution and stir evenly to prepare a spinning solution with a concentration of 10%. The carbon nanotube / PAN solution was added to the syringe, the flow rate of the syringe was adjusted to 1.2 mL / h, and the distance between the syringe and the receiving device was 15 cm, and the nanofibers were prepared by spinning under 15 kV high voltage electrostatic. The obtained composite fiber membrane is dried in an oven at 60° C. for 12 hours, and the dried composite fiber membrane is laminated through a laminator to obtain a compacted composite fiber membrane.

[0028] Take the above-mentioned compacted composite fiber membrane as a support layer, soak it in a 3% m-phenylenediamine (MPD) aqueous solution for 2 minutes, take it o...

Embodiment 2

[0033] Dissolve 0.35g carbon nanotubes in a mixed solvent of 10g N-N dimethylformamide (DMF) and NN dimethylacetamide (DMAc) (DMF: DMAc=3:1), and configure a carbon concentration of 3.5% Nanotube solution: Dissolve 1.5g of polyacrylonitrile (PAN) in the above mixed solution and stir evenly to prepare a spinning solution with a concentration of 15%. The carbon nanotube / PAN solution was added to the spinning jet head, the flow rate of the spinning jet head was adjusted to 1.5 mL / h, the spinning jet head was 20 cm away from the receiving device, and the nanofibers were prepared by spinning under 25kV high voltage electrostatic. The obtained composite fiber membrane is placed in an oven at 70° C. and dried for 8 hours, and the dried composite fiber membrane is laminated through a laminator to obtain a compacted composite fiber membrane.

[0034] Take the above-mentioned compacted composite fiber membrane as a supporting layer, soak it in a 1% o-phenylenediamine aqueous solution for 1...

Embodiment 3

[0037] Dissolve 0.5 g of carbon nanotubes in 10 g of tetrahydrofuran to prepare a 5% carbon nanotube solution; dissolve 1.2 g of a mixture of polyacrylonitrile and polyvinyl alcohol (mass ratio 1:1) in the above mixed solution, Stir evenly to obtain a spinning solution with a concentration of 12%. Add the carbon nanotube / (PAN+PVA) solution into the spinning jet head, adjust the flow rate of the spinning jet head to 1mL / h, the spinning jet head is 10cm away from the receiving device, and spin it under 20kV high voltage electrostatic. fiber. The obtained composite fiber membrane is placed in an oven at 70° C. and dried for 8 hours, and the dried composite fiber membrane is laminated through a laminator to obtain a compact composite fiber membrane.

[0038] Take the above-mentioned compacted composite fiber membrane as a supporting layer, soak it in a 5% bisphenol aqueous solution for 3.5 minutes, take it out, remove the excess solution on the surface, and then place it in 5% isoph...

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Abstract

The invention belongs to the technical field of membranes, and discloses a high-performance forward permeable membrane and an electrostatic spinning preparation method thereof. The method comprises the steps that a hydrophilic nano material and a hydrophilic macromolecular polymer are mixed and dissolved, an electrostatic spinning technique is adopted for preparing a composite nanofiber membrane; then the laminated composite nanofiber membrane is adopted as a supporting layer, an interfacial polymerization technology is utilized for synthesizing a dense skin layer on the surface of the supporting layer, and the forward permeable membrane supported by the nanofiber membrane is prepared. The prepared forward permeable membrane is high in water flux and salt rejection, and internal concentration polarization can be effectively relieved through the support-shaped structure and communicated pores of the forward permeable membrane.

Description

Technical field [0001] The invention belongs to the technical field of membrane separation, and specifically relates to a high-performance forward osmosis membrane and an electrostatic spinning preparation method thereof. Background technique [0002] Forward osmosis (FO) is a concentration-driven membrane separation technology. Its main feature is that the process driving force is osmotic pressure, low energy consumption, and good economic benefits. Compared with the traditional pressure-driven membrane separation technology, such as reverse osmosis, nanofiltration and microfiltration, the forward osmosis process also has the advantages of lighter membrane pollution, simple membrane process and equipment. At present, forward osmosis technology has been applied in the fields of energy, seawater desalination, pharmaceutical industry, wastewater treatment and food processing. As forward osmosis has attracted more and more attention, the preparation method of forward osmosis membra...

Claims

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Application Information

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IPC IPC(8): B01D71/06B01D69/10B01D69/12B01D67/00B01D61/00C02F1/44
CPCY02A20/131B01D71/06B01D61/002B01D67/0002B01D69/105B01D69/12B01D2323/02B01D2323/39B01D2325/36C02F1/445
Inventor 郑煜铭潘淑芳钟鹭斌
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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