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A kind of electrofiltration membrane and its preparation method and application

A technology of electrofiltration membrane and filtration membrane, which is applied in the field of electrofiltration membrane, can solve the problems of small surface charge of charged membrane and inability to effectively suppress the effect of concentration polarization, and achieve small molecular weight cut-off, suppression of concentration polarization and Effects of membrane fouling and increase in transmittance

Active Publication Date: 2017-04-12
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the charged membrane also has some disadvantages: first, the charge on the surface of the charged membrane is fixed, and is only suitable for intercepting solutes and colloids with corresponding charges; , but the charge on the surface of the charged membrane is small, which cannot effectively suppress the concentration polarization effect

Method used

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  • A kind of electrofiltration membrane and its preparation method and application
  • A kind of electrofiltration membrane and its preparation method and application
  • A kind of electrofiltration membrane and its preparation method and application

Examples

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Effect test

Embodiment 1

[0032]Example 1: The electrofiltration membrane is composed of bisphenol A polysulfone (PSF) and copper wire (diameter: 30 μm; specific resistance: 1.75 × 10 -8 Ω·cm) is made by the immersion gel phase inversion method, and the copper wires are arranged at a distance of 1 mm. In this embodiment, the electrofiltration membrane is connected to a single electrode for filtering dextran sulfate.

[0033] The preparation method of above-mentioned electrofiltration membrane is as follows:

[0034] (1) Put bisphenol-A polysulfone, dimethylformamide, and N-methyl-2-pyrrolidone in a reaction kettle at 80°C and mix and stir for 4 hours until completely dissolved, press filter and stand for 24 hours for defoaming , the casting solution is obtained, wherein the additions of polymer, solvent and additive are respectively 21%, 77%, 2% by the percentage of the total mass of the composition;

[0035] (2) Evenly arrange the copper wires on the glass plate fixed with non-woven fabric, the dista...

Embodiment 2

[0042] Example 2: The electrofiltration membrane is made of polyacrylonitrile (PAN) and tungsten wire (diameter: 20μm; specific resistance: 5.4×10 -8 Ω·cm) is made by the immersion gel phase inversion method, and the tungsten wires are arranged at a distance of 5mm. In this embodiment, the electrofiltration membrane is connected to a single electrode, and the opposite electrode is placed near the membrane surface of the electrofiltration membrane. Dextran sulfate was filtered.

[0043] The preparation method of above-mentioned electrofiltration membrane is as follows:

[0044] (1) Put polyacrylonitrile, N-methylpyrrolidone and dimethylacetamide in a reaction kettle and mix and stir for about 5 hours until they are completely dissolved at 70°C. After pressure filtration, stand for degassing for 30 hours to obtain a casting film solution , wherein by the percentage of the total mass of the composition, the additions of the polymer, the solvent, and the additive are respectively...

Embodiment 3

[0052] Example 3: The electrofiltration membrane is made of polyvinyl chloride (PVC) and stainless steel wire (diameter: 50μm; specific resistance: 7×10 -7 Ω·cm) is made by the immersion gel phase inversion method, and the stainless steel wires are arranged at a distance of 2 mm. In this embodiment, the electrofiltration membrane is passed through an electric current to filter dextran sulfate;

[0053] The preparation method of above-mentioned electrofiltration membrane is as follows:

[0054] (1) Put polyvinyl chloride, dimethyl sulfoxide and formamide in a reactor at 50°C and mix and stir for about 4 hours until they are completely dissolved. After pressure filtration, let stand for degassing for 15 hours to obtain a casting solution. In terms of the percentage of the total mass of the composition, the additions of the polymer, the solvent, and the additive are respectively 25%, 74%, and 1%;

[0055] (2) Evenly arrange stainless steel wires with a diameter of 50 μm on a gla...

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Abstract

The invention provides an electric-filtering membrane, a preparation method and an application thereof, belongs to the technical field of membrane separation and particularly relates to the electric-filtering membrane with which concentration polarization and membrane pollution can be inhibited. The membrane is prepared through an immersing gel phase inversion method and an electric-conductive material is added during a preparation process of the membrane so that the membrane has an electrical conductivity. In practical use, the electric-filtering membrane can be connected to a single electrode or a double electrode of a power supply. When the electric-filtering membrane is connected to the single electrode, the concentration polarization and the membrane pollution are inhibited through Donnan effect and electrostatic repulsion by charges on a surface of the membrane. An electrode, which is connected to an opposite electrode, is arranged nearby the surface of the membrane to form an electrical field between the surface of the membrane and the electrode. Under an effect of the electrical field, the inhibiting effect by the electric-filtering membrane connected to the single electrode of the power supply on the concentration polarization and the membrane pollution are enhanced. When the electric-filtering membrane is connected to the double electrode, a current passes through the surface of the membrane to form the electrical field. Charged micro-particles and colloids are far away from the surface of the membrane under the effect of the electrical field so that the effect of inhibiting the concentration polarization is achieved.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to an electric filtration membrane capable of suppressing concentration polarization and membrane fouling and an application thereof. Background technique [0002] Membrane separation technology is a green separation technology driven by pressure difference, which has the advantages of high recovery rate, no phase separation, easy operation, low energy consumption, etc. It has developed rapidly in the past 40 years and has been used in biology, food, energy, medicine, chemical , environmental protection and other fields have been widely used. Although membrane separation technology has incomparable advantages over traditional separation technologies, there are still some defects. Concentration polarization and membrane fouling are the most common problems in the membrane separation process, which have a great impact on the separation effect of the membrane. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/06B01D69/02B01D67/00B01D61/42
Inventor 瞿广飞解若松李军燕于勇涛宁平
Owner KUNMING UNIV OF SCI & TECH
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