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Membrane material for membrane distillation and preparation method thereof

A membrane material and membrane distillation technology, applied in the field of membrane distillation, can solve the problems of poor heat transfer of membrane materials and pollution of membrane materials, achieve high thermal conductivity and electrical conductivity, simple operation, resistance to hydrophobic organic pollutants and enhanced heat transfer The effect of improving the mass transfer function

Active Publication Date: 2022-03-22
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to solve the problems that the existing membrane materials used in the membrane distillation process are easily polluted and the heat transfer properties of the membrane materials are poor, and provide an asymmetric hydrophilic and hydrophobic heat-conducting membrane distillation material

Method used

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  • Membrane material for membrane distillation and preparation method thereof
  • Membrane material for membrane distillation and preparation method thereof
  • Membrane material for membrane distillation and preparation method thereof

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Embodiment 1

[0027] see figure 1 , a preparation method of a membrane material for membrane distillation, the specific steps are:

[0028] (1) Weigh 0.8 g of carboxylated carbon nanotubes (CNT-COOH) with a diameter of 10-20 nm and a length of 0.5-2 um and dissolve them in 500 mL of 10 mol / L NaOH solution, and stir magnetically at 90°C for 5 hours. Then centrifuge to separate the solid and liquid of CNT and NaOH solution, then wash with deionized water until the supernatant is neutral, and dry at 333 K for later use to obtain CNT-COONa for later use.

[0029] (2) An anhydrous ethanol solution with a concentration of 0.2 wt% CNT-COONa was prepared, and ultrasonicated for 40 min until the dispersion was uniform without stratification. Use a spray gun to evenly spray 0.2 wt% CNT-COONa ethanol solution on the surface of PVDF membrane (the surface in contact with the feed liquid), and the loading capacity is 0.57 mg / cm 2 , baked at 333 K for 10 min to obtain a PVDF / CNT film.

[0030] (3) Prep...

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Abstract

The invention discloses a membrane material for membrane distillation and a preparation method thereof, belonging to the technical field of membrane distillation. The membrane material for membrane distillation includes a base layer, on which a thermally conductive layer and a hydrophilic anti-fouling layer are sprayed sequentially, and the hydrophilic anti-fouling layer and the thermally conductive layer are loaded on the base layer; the base layer is a PVDF hydrophobic microporous membrane ; The heat conduction layer is a carbon nanotube layer, and the hydrophilic antifouling layer is a PVA layer. The invention can reduce the heat loss on the surface of the membrane, thereby forming a higher transmembrane temperature difference on both sides of the membrane material, enhancing the water production flux of the membrane, effectively alleviating the pollution of the membrane material, and prolonging the service life of the membrane material .

Description

technical field [0001] The invention relates to the technical field of membrane distillation, in particular to an asymmetric hydrophilic-hydrophobic heat-conducting membrane distillation membrane material and a preparation method thereof. Background technique [0002] Membrane distillation is a thermal desalination technique that uses hydrophobic membranes that block the passage of liquid water and entrained solids while water vapor and other volatiles pass through. The temperature differential across the membrane is driven by vaporizing the water on the feed side, passing the steam through the membrane, and then condensing the water on the permeate side. Taking seawater desalination as an example, water molecules in seawater are vaporized at a certain high temperature and pass through the hydrophobic membrane, while a large amount of salt is difficult to vaporize, and still exists in the form of ions and is intercepted on the feed side of the membrane and cannot pass throug...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/38B01D69/02B01D67/00B01D61/36C02F1/44
CPCB01D71/38B01D69/02B01D67/0079B01D61/364C02F1/447B01D2325/22B01D2325/36B01D2325/38B01D2325/26
Inventor 韩乐韩旻媛姚婧梅董婷王钰婷
Owner CHONGQING UNIV
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