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Super-hydrophobic nano-fiber composite membrane for membrane distillation and preparation method thereof

A nanofiber and composite membrane technology, applied in the field of material engineering, can solve the problems of increasing the preparation cost of membrane distillation membranes, hindering the popularization and application of membrane distillation technology, and expensive hydrophobic modifiers. The preparation method is simple and easy to operate, and the price is low.

Active Publication Date: 2018-10-02
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These hydrophobic modifiers with low surface energy are expensive and will pollute the environment, which pushes up the preparation cost of membranes for membrane distillation and seriously hinders the promotion and application of membrane distillation technology in the field of seawater desalination.

Method used

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  • Super-hydrophobic nano-fiber composite membrane for membrane distillation and preparation method thereof
  • Super-hydrophobic nano-fiber composite membrane for membrane distillation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of superhydrophobic nanofiber composite membrane for membrane distillation:

[0027] (1) 15 g of polyvinylidene fluoride (PVDF) was dissolved in 85 g of N,N-dimethylformamide (DMF), and stirred at a constant temperature in an oil bath at 80° C. for 24 hours to obtain a uniform and transparent electrospinning solution. Dissolve 0.3 g of atactic polypropylene in 99.7 g of xylene, stir in an oil bath at 99°C for 5 hours at a constant temperature to obtain a uniform and transparent suction-filtered solution, and then cool it to 60°C at 30°C for use;

[0028] (2) Add the electrospinning stock solution in (1) into the container, and control the extrusion rate by a micro-injection pump. The extrusion rate of the solution is 5 μL / min. The relative humidity is 36%, the ambient temperature is 31°C, the rotating speed of the receiving drum is 800r / min, and electrospinning is performed, the average diameter of the obtained polyvinylidene fluoride electrospun na...

Embodiment 2

[0033] A preparation method of superhydrophobic nanofiber composite membrane for membrane distillation:

[0034] (1) Dissolve 20 g of poly(vinylidene fluoride-co-hexafluoropropylene) in 80 g of N,N-dimethylacetamide as a spinning solution, and stir it in an oil bath at 40°C for 24 hours to obtain a uniform Transparent electrospinning solution. Dissolve 0.3 g of polyethylene in 99.7 g of xylene, stir in an oil bath at 99°C for 5 hours at a constant temperature to obtain a uniform and transparent suction-filtered solution, and then cool it to 50°C at 30°C for later use;

[0035] (2) Add the electrospinning stock solution in (1) into the container respectively, and control the extrusion rate by a micro-injection pump, the solution extrusion rate is 5 μL / min, the eccentric needle is connected to a high-voltage electrode, the voltage is 25kV, and the receiving distance is 15cm , air relative humidity is 32%, ambient temperature is 30 ℃, and receiving drum rotating speed is 700r / mi...

Embodiment 3

[0040] A preparation method of superhydrophobic nanofiber composite membrane for membrane distillation:

[0041] (1) 8 g of polyacrylonitrile was dissolved in 92 g of N,N-dimethylformamide, and stirred at a constant temperature in an oil bath at 50° C. for 6 h to obtain a uniform and transparent electrospinning solution. Dissolve 0.6 g of atactic polypropylene in 99.4 g of cyclohexane, stir in an oil bath at 95°C for 5 hours at a constant temperature to obtain a uniform and transparent suction-filtered solution, and then cool it to 30°C at 20°C for use;

[0042] (2) Add the electrospinning stock solution in (1) into the container, and the extrusion rate is controlled by a micro-injection pump. The extrusion rate of the solution is 16 μL / min. The relative humidity is 36%, the ambient temperature is 31°C, the rotating speed of the receiving drum is 800r / min, and electrospinning is carried out, the average diameter of the obtained polyacrylonitrile electrospun nanofibers is 250nm...

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Abstract

The invention discloses a super-hydrophobic nano-fiber composite membrane for membrane distillation and a preparation method thereof. The nano-fiber composite membrane has a double-layer structure andcomprises a base layer and a surface layer which are compounded with each other, wherein the base layer is a nano-fiber base film and the surface layer is a porous super-hydrophobic separation layer.The preparation method comprises the following steps: preparing a base layer by adopting a polymer solution electrostatic spinning method, and then carrying out hot pressing treatment; thermally dissolving a polyolefin material in a solvent and stirring them evenly, removing a solvent-rich phase under an external force of a vacuum-assisted suction filtration method, and depositing a polymer-richphase on the surface of the base layer; and then, adding a volatile polyolefin non-solvent to construct a nano-fiber composite membrane with a porous structure skin layer on a microscopic scale. The product membrane prepared by the method provided by the invention is efficient and durable, the preparation method is simple and feasible, the defects of high price, low porosity, low water vapor fluxand easy wetting of membrane pores of a traditional membrane distillation membrane can be obviously improved, and the large-scale modification of the existing membrane distillation membrane can be easily realized.

Description

technical field [0001] The invention relates to a super-hydrophobic nanofiber composite membrane with a honeycomb structure prepared by depositing low-surface-energy polyolefin by a vacuum-assisted suction filtration method for membrane distillation and a preparation method thereof, belonging to the technical field of material engineering. Background technique [0002] Pollution and shortage of water resources are common problems faced by the current society. Membrane separation technology, as a new type of efficient separation, purification, purification and concentration technology, has been widely used in seawater desalination, wastewater treatment and other fields. In many membrane separation technologies Among them, membrane distillation has received more and more attention and research because of its unique advantages (such as the availability of low-quality heat sources, high rejection rate, simple equipment, mild and convenient operating conditions, etc.) [Wang Z, Hou...

Claims

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Application Information

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IPC IPC(8): B01D61/36B01D67/00B01D69/08B01D69/12
CPCB01D61/364B01D67/0002B01D69/08B01D69/12B01D2323/04
Inventor 王雪芬邓莉李沛云叶浩辉张同辉陈娟孙丁刘康
Owner DONGHUA UNIV
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