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Amphoteric composite forward osmosis membrane as well as preparation method and application thereof

A forward osmosis membrane and amphoteric technology, applied in the field of amphoteric composite forward osmosis membrane and its preparation, can solve the problems of uneven polyamide layer, low porosity, concentration polarization, etc., and achieve the effect of promoting rapid evacuation

Inactive Publication Date: 2020-02-28
吾净科技(深圳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional support membranes are polysulfone and polyethersulfone ultrafiltration membranes prepared by non-solvent (water) induced phase separation. If it is greater than 80°, it is not conducive to the diffusion of the aqueous phase monomer on the membrane surface during the interfacial polymerization process, which will easily lead to uneven polyamide layers and many defects
Such a support membrane often results in low flux of the composite forward osmosis membrane, and the slow diffusion rate of the draw solution leads to serious concentration polarization.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] (1) Evenly disperse 5 mg graphene oxide in 100 mL N-methylpyrrolidone, add 5 mg dopamine, 5 mg polyethyleneimine, and 5 g polyvinylidene fluoride, react at 80 °C for 1 h, and spread it evenly on the nonwoven Cloth surface to obtain a liquid film, and then exposed to humid air with a humidity of 60% for 5 seconds, water vapor-induced phase separation occurs, immersed in methanol, and then immersed in an aqueous sodium chloride solution to obtain a superhydrophilic polyvinylidene fluoride film;

[0069] (2) Immerse the polyvinylidene fluoride film in an aqueous solution with a concentration of 0.2g / L m-phenylenediamine, take it out after soaking for 30s, drain the water on its surface and immerse it in n-hexane with a concentration of 0.2g / L trimesoyl chloride Solution, after reacting for 1 minute, take it out and put it in an oven, and heat-treat it at 90°C for 3 minutes to obtain a polyamide composite film;

[0070] (3) Immerse the polyamide composite membrane in an eth...

Embodiment 2

[0073] (1) Evenly disperse 1g of graphene oxide in 100mL of N,N'-dimethylformamide, add 10g of catechol, 10g of γ-aminopropylene triethoxysilane and 25g of polyvinylidene fluoride, and react at 80°C After 24 hours, it was uniformly coated on the surface of the non-woven fabric to obtain a liquid film, and then exposed to humid air with a humidity of 100% for 2 hours, water vapor induced phase separation occurred, immersed in ethanol, and then immersed in potassium chloride aqueous solution after taking it out, Obtain superhydrophilic polyvinylidene fluoride membrane;

[0074] (2) Immerse the polyvinylidene fluoride film in an aqueous solution with a concentration of 10g / L o-phenylenediamine, take it out after soaking for 10min, drain the water on its surface and immerse it in n-hexane with a concentration of 10g / L terephthaloyl chloride The solution was taken out after reacting for 5 minutes, and heat-treated at 90°C for 3 minutes to obtain a polyamide composite film;

[0075...

Embodiment 3

[0078] (1) Evenly disperse 0.1g graphene oxide in 100mL N,N'-dimethylacetamide, add 1g tannic acid, 2g amino-cage polysilsesquioxane and 15g polyvinylidene fluoride, 80°C After reacting for 8 hours, it was uniformly coated on the surface of non-woven fabric to obtain a liquid film, and then exposed to 100% humid air for 0.5 hours, water vapor induced phase separation occurred, immersed in isopropanol, and then immersed in Magnesium chloride aqueous solution to obtain a superhydrophilic polyvinylidene fluoride membrane;

[0079] (2) Immerse the polyvinylidene fluoride film in an aqueous solution with a concentration of 2g / L p-phenylenediamine, take it out after soaking for 5min, drain the water on its surface and immerse it in the n-hexyl dichloride with a concentration of 0.3g / L. alkane solution, take it out after reacting for 1min, and heat-treat at 90°C for 5min to obtain a polyamide composite membrane;

[0080] (3) Immerse the polyamide composite membrane in an ethanol sol...

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PUM

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Abstract

The invention relates to an amphoteric composite forward osmosis membrane. According to the amphoteric composite forward osmosis membrane, an adopted porous support membrane is a super-hydrophilic polyvinylidene fluoride membrane; a polyamide layer is formed on the porous support membrane, and a zwitterionic layer is formed on the polyamide layer. In the present invention, the zwitterionic layer is formed by amido groups through zwitterionic reaction; through cooperation with the super-hydrophilic characteristic of the polyvinylidene fluoride membrane prepared through water vapor induced phaseseparation, the strong hydration and the charging performance of a catechol derivative modified graphene oxide nano-water channel and the zwitterionic skin layer, the water flux of the composite forward osmosis membrane is greatly improved while a low back-mixing salt flux is kept.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to an amphoteric composite forward osmosis membrane and its preparation method and application. Background technique [0002] Forward osmosis membrane seawater desalination technology is a forward-looking technology that has emerged in recent years to solve water resource problems. Forward osmosis refers to the process in which water is transferred from one end of a low osmotic pressure solution to one end of a high osmotic pressure solution through a selective semipermeable membrane, while solutes or ions are trapped. Forward osmosis is a spontaneous osmotic process that does not require external pressure to drive , can screen out harmful substances such as inorganic salts, heavy metals and microorganisms in water. [0003] The common forward osmosis membrane is a composite membrane composed of a porous support membrane in the lower layer and an ultra-thin polyamide sk...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D71/34B01D71/06B01D71/02B01D69/12B01D67/00B01D61/00C02F1/44
CPCB01D61/002B01D67/0079B01D69/12B01D71/021B01D71/06B01D71/34B01D71/56C02F1/445Y02A20/131
Inventor 程梁赵瑞吴贵莎
Owner 吾净科技(深圳)有限公司
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