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Preparation method of electrostatic spinning hydrophobic nanofiber porous membrane for membrane distillation

An electrospinning, hydrophobic nanotechnology, which is applied in the field of preparation of separation membranes for membrane distillation, can solve the problems of insufficient commercialization of membrane distillation technology, small application scale and scope, etc. The defect of easy wetting of membrane pores, the simple and easy preparation method, and the effect of precise control

Inactive Publication Date: 2013-08-28
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the commercialization of membrane distillation technology has not received sufficient attention, and the actual application scale and scope are relatively small.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Dissolve 25 g of polystyrene (PS) in 75 g of N,N-dimethylformamide (DMF) solvent, and stir in an oil bath at 40°C for 24 hours to obtain a transparent and uniform electrospinning solution.

[0024] (2) Add the electrospinning stock solution in (1) into the container, and extrude under the control of a micro-injection pump. The needle nozzle is connected to the high-voltage positive electrode. The extrusion rate is 5 μl / min, the receiving distance is 15cm, the ambient temperature is 40°C, the relative humidity of the air is 25%, the receiving drum speed is 1000r / min, the drum receiving range is 20cm, and the deposition volume is 2.5ml. Electrospinning , the obtained polystyrene (PS) electrospun nanofibers had an average diameter of 500 nm, a porosity of 89%, a water contact angle of 150.2°, and a thickness of 60 μm.

[0025] (3) The prepared highly hydrophobic polystyrene (PS) nanofiber porous membrane has an average flow pore size of 0.76 μm, a pore size distributio...

Embodiment 2

[0030] (1) Dissolve 25g of polyvinylidene fluoride (PVDF) in 75g of a mixed solvent (volume ratio 7 / 3) of N,N-dimethylformamide (DMF) and acetone, first dissolve PVDF in DMF, and Stir in an oil bath at a temperature of ℃ for 24 hours, then add acetone into the PVDF solution, and stir at room temperature for 24 hours to obtain a transparent and uniform electrospinning solution.

[0031] (2) Add the electrospinning stock solution in (1) into the container, and extrude under the control of a micro-injection pump. The needle nozzle is connected to the high-voltage positive electrode. The extrusion rate is 10μl / min, the receiving distance is 15cm, the ambient temperature is 25°C, the relative air humidity is 45%, the receiving drum speed is 500r / min, the drum receiving range is 20cm, and the deposition volume is 10ml. Electrospinning is carried out. The obtained polyvinylidene fluoride (PVDF) electrospun nanofibers had an average diameter of 400 nm, a porosity of 85%, a water conta...

Embodiment 3

[0037] (1) Dissolve 5 g of cellulose triacetate (CTA) in 95 g of a mixed solvent of dichloromethane and ethanol (volume ratio 8 / 2), and stir at room temperature for 24 h to obtain a transparent and uniform electrospinning solution.

[0038] (2) Add the electrospinning stock solution in (1) into the container, and extrude under the control of a micro-injection pump. The needle nozzle is connected to the high-voltage positive electrode. The extrusion rate is 30μl / min, the receiving distance is 15cm, the ambient temperature is 25°C, the relative air humidity is 45%, the receiving drum speed is 500r / min, the drum receiving range is 20cm, and the deposition volume is 10ml. Electrospinning is carried out. The obtained cellulose triacetate (CTA) electrospun nanofibers had an average diameter of 600 nm, a porosity of 80%, a water contact angle of 140.6°, and a thickness of 280 μm.

[0039] (3) The prepared highly hydrophobic cellulose triacetate (CTA) nanofiber porous membrane has an ...

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Abstract

The invention relates to a preparation method of an electrostatic spinning hydrophobic nanofiber porous membrane for membrane distillation. The method comprises the following steps of: dissolving a hydrophobic functional polymer material in the solvent to get a 1-35wt% polymer spinning solution, performing electrostatic spinning to get a hydrophobic nanofiber porous membrane, and further performing thermal treatment, thereby obtaining the electrostatic spinning hydrophobic nanofiber porous membrane for membrane distillation. The preparation method provided by the invention is simple and practicable, and can be used for conveniently and accurately controlling the thickness and uniformity of the nanofiber membrane and realizing operations of mass production more easily; the high-hydrophobicity nanofiber porous membrane prepared by the preparation method can be used for signally improving the defects of the conventional membrane for membrane distillation that the water flux is low and the membrane pores get wet easily, so that the membrane distillation technology can compete with a reverse osmosis technology in the seawater desalination field.

Description

technical field [0001] The invention belongs to the field of preparation of separation membranes for membrane distillation, and in particular relates to a preparation method of electrospinning hydrophobic nanofiber porous membranes for membrane distillation. Background technique [0002] The shortage of water resources and the deterioration of water environment are common problems in the world today. As a new type of high-efficiency separation, concentration, purification and purification technology, membrane separation technology has been widely used in seawater desalination, industrial wastewater treatment, environmental pollution control and other fields. , and membrane distillation occupies an important place in the field of membrane separation technology with its unique advantages. Membrane distillation is a membrane separation process that uses a highly hydrophobic microporous membrane under heat-driven conditions and uses the vapor pressure difference on both sides of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D67/00B01D71/28B01D71/34B01D71/16B01D71/50B01D71/30B01D61/36D04H1/728D04H1/4382
Inventor 王雪芬李雄洪贵山神领弟王敏于旭峰汪策
Owner DONGHUA UNIV
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