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Preparation method and regeneration method of renewable polyelectrolyte membrane for forward osmosis technology

A polyelectrolyte and forward osmosis technology, which is applied in the field of membrane treatment and preparation, can solve the problems of membrane pollution, concentration polarization and high membrane flux, achieve strong anti-pollution and corrosion resistance, reduce membrane pollution and long working life. Effect

Active Publication Date: 2020-12-22
江苏海壹环境科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of easy fouling and concentration polarization of the membrane in the existing forward osmosis technology, the purpose of the present invention is to provide a method for preparing a renewable polyelectrolyte membrane used in the forward osmosis technology and a regeneration method thereof. Strong salt interception ability, high membrane flux, good hydrophilicity, strong anti-fouling ability

Method used

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  • Preparation method and regeneration method of renewable polyelectrolyte membrane for forward osmosis technology
  • Preparation method and regeneration method of renewable polyelectrolyte membrane for forward osmosis technology

Examples

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Comparison scheme
Effect test

Embodiment 1

[0033] as attached figure 1 And attached figure 2 as shown,

[0034] The preparation method of the renewable polyelectrolyte membrane that is used for forward osmosis technology comprises the following steps:

[0035] Step 1, preparation of support layer polyethersulfone (PES) membrane

[0036] Prepared by phase inversion method: Take 20g of PES particles and 4.5g of polyvinylpyrrolidone (PVP K-30) powder and dissolve them in 80ml of N-methylpyrrolidone (NMP), shake in a water bath at 50°C for 6h, and after cooling Pour the film casting solution into a smooth glass plate, scrape out a 150 μm thick liquid film with a scraper, let it stand for 1 minute, and then put it in a hydrocoagulation bath to obtain a polyethersulfone film;

[0037] Step 2, preparation of selection layer

[0038] Soak the PES membrane in 2gL -1 In the dopamine solution, the solution was exposed to the air for 5h, and the dopamine solution consisted of 200mg of dopamine dissolved in 100ml of Tri-HCl (...

Embodiment 2

[0047] The preparation method of the renewable polyelectrolyte membrane that is used for forward osmosis technology comprises the following steps:

[0048] Step 1, preparation of support layer polyethersulfone (PES) membrane

[0049] Prepared by phase inversion method: Dissolve 16g of PES granules and 2g of polyvinylpyrrolidone (PVP K-30) powder in 75ml of N-methylpyrrolidone (NMP), shake it in a water bath at 50°C for 4 hours, and cast it after cooling Pour the membrane solution into a smooth glass plate, scrape out a 100 μm thick liquid membrane with a scraper, let it stand for 1 minute, and then use a hydrocoagulation bath to obtain a polyethersulfone membrane;

[0050] Step 2, preparation of selection layer

[0051] Soak the PES membrane in 1.3gL -1In the dopamine solution, the solution was exposed to the air for 5h, and the dopamine solution consisted of 200mg of dopamine dissolved in 100ml of Tri-HCl (10mmolL -1 , pH 8.5) solution obtained polyethersulfone membrane af...

Embodiment 3

[0060] The preparation method of the renewable polyelectrolyte membrane that is used for forward osmosis technology comprises the following steps:

[0061] Step 1, preparation of support layer polyethersulfone (PES) membrane

[0062] Prepared by phase inversion method: Dissolve 18g of PES granules and 2.8g of polyvinylpyrrolidone (PVP K-30) powder in 78ml of N-methylpyrrolidone (NMP), shake in a water bath at 50°C for 4h, cool Pour the film casting solution into a smooth glass plate, scrape out a 130μm thick liquid film with a scraper, let it stand for 1 minute, and then put it in a hydrocoagulation bath to obtain a polyethersulfone film;

[0063] Step 2, preparation of selection layer

[0064] Soak the PES membrane in 1.8gL -1 In the dopamine solution, the solution was exposed to the air for 5h, and the dopamine solution consisted of 200mg of dopamine dissolved in 100ml of Tri-HCl (10mmolL -1 , pH 8.5) solution obtained polyethersulfone membrane after self-polymerization o...

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Abstract

The invention discloses a preparation method of a renewable polyelectrolyte membrane for forward osmosis technology and a regeneration method thereof. Polydopamine is used for modification of polyethersulfone surface and a selection layer is formed, layer-by-layer self-assembly technology is used for growth of polyethyleneimine and polyacrylic acid on the surface of the selection layer, and a regeneration layer is formed. The polyelectrolyte membrane employs polydopamine as the selection layer, inner concentration polarization is effectively reduced, and risk of membrane pollution is reduced;after membrane flux of the polyelectrolyte membrane is reduced due to membrane pollution, hydrochloric acid can be used for cleaning the regeneration layer, and the self-assembly technology is used for recovering interception performance of the membrane; the electrolyte membrane has low energy consumption and high water recovery rate for treating waste water containing salt; the surface hydrophilicity of the membrane is good, and pollution resistance and corrosion resistance are good, and working life is longer.

Description

technical field [0001] The invention belongs to the technical field of membrane treatment and preparation, and in particular relates to a preparation method and regeneration method of a renewable polyelectrolyte membrane used in forward osmosis technology. Background technique [0002] Forward osmosis is one of the hot spots in the field of membrane separation worldwide. It has obvious advantages such as light membrane pollution, no need for external pressure, low energy consumption, high water recovery rate, and recyclable energy. , industrial wastewater treatment, food processing, protein concentration, and aerospace and other fields, are playing an increasing role. However, the concentration polarization phenomenon and membrane fouling have become the main factors that limit the wide application of forward osmosis technology. The two are different concepts, but in the actual process, they are interrelated and affect each other. Concentration polarization increases the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/82B01D69/02B01D67/00B01D61/00B01D65/08B01D65/02
CPCB01D61/002B01D65/02B01D65/08B01D67/0006B01D67/0093B01D69/02B01D71/82B01D2321/162B01D2325/30B01D2325/36
Inventor 许航李洋陈卫沈桢丁明梅王康林晨烁王月婷
Owner 江苏海壹环境科技有限公司
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