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Friction-resistant and anti-pollution super-hydrophobic membrane for membrane distillation process and preparation method thereof

A distillation process, super-hydrophobic technology, applied in water/sewage treatment, general water supply saving, chemical instruments and methods, etc., can solve problems such as loss of separation performance, achieve good stability and anti-friction performance, improve super-hydrophobicity, The effect of reducing membrane fouling

Active Publication Date: 2020-11-03
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common sense tells us: the hydrophobic membrane material is hydrophobic, there is no protective layer of water molecules, and the membrane material is easy to absorb organic substances (such as surfactants), thus forming pollution, causing membrane wetting and losing the original separation performance

Method used

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  • Friction-resistant and anti-pollution super-hydrophobic membrane for membrane distillation process and preparation method thereof
  • Friction-resistant and anti-pollution super-hydrophobic membrane for membrane distillation process and preparation method thereof
  • Friction-resistant and anti-pollution super-hydrophobic membrane for membrane distillation process and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A high-porosity nanofibrous support layer was prepared by electrospinning 8 wt% PVDF solution. The PVDF nanofibrous membrane is named PVDF.

[0029] On the upper part of the nanofiber support layer, a mixed solution prepared by dissolving or dispersing PVDF, PDMS and silicon dioxide in N,N-dimethylformamide (DMF) is used to prepare a superhydrophobic surface layer by electrostatic spraying. The concentrations of PVDF and PDMS in the solution were 2wt% and 3wt%, respectively. Dissolve the PDMS monomer and cross-linking curing agent (10:1) in a mixed solvent of N,N-dimethylformamide (DMF) and tetrahydrofuran (THF) (1:1) to obtain a 3wt% PDMS solution, Then 2 wt% PVDF was added to obtain a homogeneous PVDF / PDMS solution. 3wt% silicon dioxide powder was dispersed in the solution to electrostatically spray the PVDF / PDMS / silicon dioxide composite superhydrophobic layer on the surface of the PVDF nanofiber support layer. The bilayer membrane was named PDMS-3. The preparati...

Embodiment 2

[0031] By testing the hydrophobic performance and anti-friction performance of the superhydrophobic film of the present invention obtained in Example 1, it is concluded that the superhydrophobic film not only exhibits excellent superhydrophobicity, the water contact angle is 170 ± 1 degree, and the superhydrophobic The layer has excellent anti-friction properties and is still superhydrophobic after 40 friction cycles, the results are as follows figure 2 and image 3 shown.

Embodiment 3

[0033] By carrying out anti-scaling and anti-fouling performance tests to the super-hydrophobic membrane of the present invention obtained in Example 1, it can be seen from the membrane distillation test results that compared with PVDF nanofibrous membranes and commercial PVDF membranes, the super-hydrophobic membrane has excellent anti-scaling and anti-fouling properties. Anti-pollution properties. When using 3.5wt% sodium chloride solution as the feed liquid, the temperature of the feed liquid side is 333K, and when the permeation temperature is 293K, 28Lm can be obtained -2 h -1 stable flux.

[0034] The superhydrophobic membrane has excellent anti-fouling and anti-fouling properties, which can make membrane distillation technology treat wastewater containing various inorganic and organic pollutants in practical applications, including: 1) by 35g / L NaCl, 3g / L CaCl 2 ,3g / L Na 2 SO 4 Composed feed liquid: Under the condition of the feed liquid, the feed side and the wate...

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Abstract

The invention discloses a friction-resistant and anti-pollution super-hydrophobic membrane aiming at a membrane distillation process and a preparation method thereof, wherein the super-hydrophobic membrane is a double-layer membrane structure formed by a nanofiber support layer and a composite super-hydrophobic layer, and the super-hydrophobic membrane has friction resistance. In order to improvethe wetting resistance of the membrane in the membrane distillation process, the novel friction-resistant and pollution-resistant super-hydrophobic membrane is prepared through electrostatic spinningand electrostatic spraying. The method is applied to the membrane distillation process, and the super-hydrophobicity of the membrane can be effectively improved. The super-hydrophobic surface has goodstability and friction resistance, and can effectively reduce membrane pollution in the membrane distillation process, so that the membrane material has more excellent stability in the long-term testprocess.

Description

technical field [0001] The invention belongs to the fields of wastewater treatment and seawater desalination, and in particular relates to a friction-resistant and anti-pollution super-hydrophobic membrane aimed at membrane distillation process and a preparation method thereof. Background technique [0002] Membrane distillation (Membrane Distillation, MD) is a membrane separation process in which the hydrophobic membrane material is used as the separation medium and the vapor pressure difference is the driving force. Unlike reverse osmosis desalination, there is a phase change in the membrane distillation process and the energy consumption is high. Therefore, its application is generally in the fields where reverse osmosis is not applicable and the treatment capacity is relatively small, and it has potential application prospects in the directions of zero discharge of industrial sewage, deep concentration of concentrated brine, and mobile miniaturized pure water preparation...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D67/00B01D69/02B01D69/12B01D71/02B01D71/70C02F1/44
CPCB01D71/34B01D71/70B01D71/027B01D69/02B01D69/12B01D67/0079C02F1/447B01D2325/38B01D2325/24B01D2325/30Y02A20/131
Inventor 廖园黄津辉郑广泰
Owner NANKAI UNIV
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