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Wetting-resistant and oil-stain-resistant Janus type distillation membrane as well as preparation method and application thereof

A distillation membrane, anti-oil technology, applied in chemical instruments and methods, membrane, membrane technology and other directions, can solve the problems of being easily wetted by oil-containing liquids and low surface tension substances, and achieve not easy to fall off, good stability, and simple preparation. Fast, effective and environmentally friendly results

Inactive Publication Date: 2020-10-09
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Modified on the basis of commercial membranes, the rapid preparation of membranes can be realized by simple deposition and spraying methods, which solves the problem that commercial membranes are easily wetted by oily liquids and low surface tension substances, and can be well applied to membrane distillation processes , can be used to treat oily high-salt wastewater

Method used

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  • Wetting-resistant and oil-stain-resistant Janus type distillation membrane as well as preparation method and application thereof
  • Wetting-resistant and oil-stain-resistant Janus type distillation membrane as well as preparation method and application thereof
  • Wetting-resistant and oil-stain-resistant Janus type distillation membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A kind of preparation method of the Janus type distillation membrane of resistance to wetting, oil pollution, the steps are as follows:

[0053] (1) Dopamine was added to 10 mM Tirs-HCl buffer solution with pH=8.5, so that the concentration of dopamine solution was 0.5 g / L. Put a commercial PTFE membrane with a size of 3*8cm into the PDA solution and vibrate at 100r / min and a temperature of 25°C to make the PDA evenly adhere to the surface of the membrane.

[0054] (2) Rinse the membrane surface with deionized water at least three times to obtain a hydrophilic cortical basement membrane;

[0055] (3) Add 5gPAL to 50mL, the concentration is C HCl =1M hydrochloric acid solution and stirred for 2h for activation, the stirring speed was 650rpm. Then it was washed with deionized water to pH 6, then dried in a vacuum oven at 105 °C to constant weight, and the dried PAL was ground into a powder.

[0056] (4) Take 0.1 g of PAL activated in step (3) and add it to 60 mL of Tir...

Embodiment 2

[0061] A kind of preparation method of the Janus type distillation membrane of resistance to wetting, oil pollution, the steps are as follows:

[0062] (1) Dopamine was added to 10 mM Tirs-HCl buffer solution with pH=8.5, so that the concentration of dopamine solution was 0.5 g / L. Put a commercial PVDF membrane with a size of 3*8cm into the PDA solution and shake it at 100r / min and at a temperature of 25°C to make the PDA evenly adhere to the surface of the membrane;

[0063] (2) Rinse the membrane surface with deionized water at least three times to obtain a hydrophilic cortical basement membrane;

[0064] (3) Take 0.1g CNT and add it to 50mL Tirs-HCl buffer solution for ultrasonication, then add dopamine to the uniformly mixed suspension to make the concentration reach 0.05-1.5g / L, stir at room temperature for 3 hours, and wait until the solution is fully mixed , was centrifuged and washed to neutral, and dried in vacuum at 60°C for 10 hours to obtain dopamine-modified CNTs...

Embodiment 3

[0068] A kind of preparation method of the Janus type distillation membrane of resistance to wetting, oil pollution, the steps are as follows:

[0069] (1) Dopamine was added to 10 mM Tirs-HCl buffer solution with pH=8.5, so that the concentration of dopamine solution was 0.5 g / L. Put a commercial PP film with a size of 3*8cm into the PDA solution and shake it at 100r / min and at a temperature of 25°C to make the PDA evenly adhere to the surface of the film.

[0070] (2) Rinse the membrane surface with deionized water at least three times to obtain a hydrophilic cortical basement membrane;

[0071] (3) Take 0.1g CNF and add it into 50mL Tirs-HCl buffer solution for ultrasonication, then add dopamine to the uniformly mixed suspension to make the concentration reach 0.05-1.5g / L, and stir at room temperature for 3 hours. After the solution is fully mixed, it is centrifuged and washed to neutrality. And vacuum-dried at 60°C for 10 hours to obtain dopamine-modified CNF.

[0072] ...

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Abstract

The invention relates to a wetting-resistant and oil-stain-resistant Janus type distillation membrane and a preparation method and application thereof. The distillation membrane comprises a base membrane, wherein one side of the base membrane is a hydrophilic skin layer, the other side of the base membrane is a fully-hydrophobic skin layer, and the hydrophilic skin layer is a polydopamine layer; and the fully-hydrophobic layer is a PAL layer modified by dopamine. The Janus type distillation membrane has an asymmetric structure in the membrane thickness direction, is hydrophilic on one side andsuper-hydrophobic on the other side, and has good wetting resistance, pollution resistance and thermal stability. The preparation method of the membrane is simple, relatively low in cost and relatively environment-friendly. The asymmetric fully-hydrophobic membrane has good wetting resistance and pollution resistance, can treat high-salt oil-containing wastewater, has good stability, can basically achieve 100% desalination, and keeps stable flux in long-term use.

Description

technical field [0001] The invention relates to a Janus-type distillation membrane resistant to moisture and oil pollution, a preparation method and application thereof, and belongs to the technical fields of bionic interface material technology and membrane distillation technology. Background technique [0002] Membrane distillation technology is a heat-driven membrane separation process. Microporous hydrophobic membrane is used as the separation medium, and the vapor pressure difference on both sides of the membrane is used as the driving force for mass transfer. Set to achieve efficient separation of water and pollutants, and high-quality separation products can be obtained. Membrane distillation process has the advantages of nearly 100% salt interception rate, low operating temperature, low-grade heat energy such as waste energy, and low requirements on the mechanical properties of the membrane. It shows good separation effect and huge market potential in challenging wa...

Claims

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Application Information

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IPC IPC(8): B01D69/02B01D67/00B01D61/36
CPCB01D61/364B01D67/0002B01D69/02B01D2323/02B01D2323/04B01D2325/36B01D2325/38
Inventor 王志宁张嘉辉包艳
Owner SHANDONG UNIV
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