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Electrostatically-spun nanofiber-based double-skin-layer forward osmosis membrane and preparation method thereof

An electrospinning and nanofiber technology, applied in the field of electrospinning nanofiber-based double-skinned forward osmosis membrane and its preparation, can solve problems such as imperfection, hinder industrial development, etc. chemical phenomenon, the effect of excellent anti-pollution performance

Inactive Publication Date: 2019-12-13
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although forward osmosis technology has developed rapidly in recent years, it is not perfect in practical application, and there are still a series of technical obstacles hindering its industrial development, and it is unlikely to replace the position of reverse osmosis (RO) technology at present.

Method used

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  • Electrostatically-spun nanofiber-based double-skin-layer forward osmosis membrane and preparation method thereof
  • Electrostatically-spun nanofiber-based double-skin-layer forward osmosis membrane and preparation method thereof
  • Electrostatically-spun nanofiber-based double-skin-layer forward osmosis membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Add 20g of PVDF to a mixed solvent of 64gDMF and 16g of acetone, stir and dissolve at 25°C for 24h, then let stand at 25°C for 48h to completely defoam, and finally obtain a spinning fiber with a mass concentration of 20%. liquid;

[0033] (2) Put the spinning solution into the syringe, and use a 0.8mm flat needle for electrospinning. The extrusion rate of the spinning solution is 1.0ml / h, the spinning voltage is 15kV, and the receiving distance from the top of the needle to the collector is 15 cm, the rotating speed of the collector is 300 rpm, the horizontal reciprocating speed of the flat needle along the roller direction of the collector is 1.0 cm / s, the spinning temperature is 25° C., and the relative humidity is 25% RH.

[0034] (3) m-phenylenediamine and ethylenediamine are dissolved in deionized water, and the mass concentration is 3.0% and 0.5%, respectively. As the first aqueous phase solution, trimesoyl chloride is dissolved in n-hexane, and the mass conc...

Embodiment 2

[0042] (1) Add 12g of Nylon to 70.4g of formic acid and 17.6g of dichloromethane, heat and stir to dissolve at 50°C for 12h, then let stand at 50°C for 12h to completely defoam, and finally obtain The spinning solution whose mass concentration is 12%;

[0043] (2) Put the spinning solution into the syringe, and use a 0.6mm flat needle for electrospinning. The extrusion rate of the spinning solution is 0.5ml / h, the spinning voltage is 25kV, and the receiving distance from the top of the needle to the collector is 8 cm, the rotational speed of the collector is 100 rpm, the horizontal reciprocating speed of the flat needle along the roller direction of the collector is 0.5 cm / s, the spinning temperature is 23° C., and the relative humidity is 15% RH.

[0044] (3) dissolving m-phenylenediamine in water with a mass concentration of 3.0%, fully stirring it as the first aqueous phase solution, dissolving trimesoyl chloride in n-heptane with a mass concentration of 0.10%, as the first...

Embodiment 3

[0052] (1) Add 15g of PVDF and 10g of PAN to 75g of DMAc, heat and stir to dissolve at 80°C for 6h, then let it stand at 80°C for 12h to completely defoam, and finally obtain a mass concentration of 25% spinning solution;

[0053] (2) Put the spinning solution into the syringe, and use a 1.0mm flat needle for electrospinning. The extrusion rate of the spinning solution is 2.0ml / h, the spinning voltage is 20kV, and the receiving distance from the top of the needle to the collector is 20 cm, the rotating speed of the collector is 500 rpm, the horizontal reciprocating speed of the flat needle along the roller direction of the collector is 2.0 cm / s, the spinning temperature is 28° C., and the relative humidity is 20% RH.

[0054] (3) m-phenylenediamine and hexamethylenediamine are dissolved in water, and the mass concentration is 4.0% and 1.0% respectively, as the first aqueous phase solution, trimesoyl chloride is dissolved in n-hexane, and the mass concentration is 0.50%, as Th...

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Abstract

The invention discloses an electrostatically-spun nanofiber-based double-skin-layer forward osmosis membrane and a preparation method thereof. The forward osmosis membrane comprises an electrostatically-spun nanofiber-based membrane layer in the middle and polyamide skin layers located on the upper side and the lower side of the electrostatically-spun nanofiber-based membrane layer. The preparation method comprises the following steps: dissolving a high polymer in a solvent to prepare a spinning solution; carrying out electrostatic spinning on the spinning solution to obtain an electrostatically-spun nanofiber base membrane; and carrying out interfacial polymerization reaction on the upper surface and the lower surface of the electrostatically-spun nanofiber base membrane to finally obtainthe electrostatically-spun nanofiber-base double-skin-layer forward osmosis membrane which uses electrostatically-spun nanofibers as the base membrane and has a double-skin-layer structure. The forward osmosis membrane has the advantages that the high porosity and the three-dimensional through hole structure of the electrostatically-spun nanofibers can effectively relieve the phenomenon of internal concentration polarization in the base membrane, and the water flux of the forward osmosis membrane is improv the double-skin-layer structure can effectively prevent a solute in the raw material liquid from entering the base membrane layer, so the surface of the membrane is endowed with excellent anti-pollution performance; and thus, the forward osmosis membrane with high flux and strong anti-pollution performance is prepared.

Description

technical field [0001] The invention belongs to the technical field of forward osmosis membranes, and in particular relates to an electrospun nanofiber-based double-skin forward osmosis membrane and a preparation method thereof. Background technique [0002] Forward osmosis (FO) is an osmotic pressure-driven membrane separation process, which has attracted the attention of many researchers because of its unique advantages such as no external pressure and relatively low membrane fouling. Forward osmosis technology is known as the most potential new technology for desalination and water purification, and has broad application prospects in the field of water treatment, such as seawater desalination, drinking water purification, domestic sewage reuse, industrial wastewater treatment, landfill leachate treatment, Drug and food concentration, etc. Although forward osmosis technology has developed rapidly in recent years, it is still not perfect in practical application. There are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/00B01D65/02B01D65/10B01D67/00B01D71/34B01D71/42B01D71/48
CPCB01D61/002B01D65/02B01D65/10B01D67/0006B01D71/34B01D71/42B01D71/48
Inventor 刘长坤赵丽华
Owner SHENZHEN UNIV
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