A hybrid composite forward osmosis membrane assisted by dopamine modification and preparation method thereof

A technology of forward osmosis membrane and hybrid composite, which is applied in the field of membrane separation, can solve the problems of low adhesion fastness of polyamide functional layer, low porosity of porous support membrane, small water flux, etc., and solve the problem of interface description , Improve water flux and reduce membrane resistance

Active Publication Date: 2022-04-08
绍兴市俱和环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional blending method of nanomaterials has an insurmountable problem of interfacial compatibility between inorganic and organic materials, and defects are easily formed; the polyamide skin layer prepared by interfacial polymerization is very dense, and the water flux is small; the porosity of the porous support membrane is low, The film resistance is large, and the smooth film surface makes the adhesion of the polyamide functional layer not high and easy to fall off

Method used

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  • A hybrid composite forward osmosis membrane assisted by dopamine modification and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Add 5g of polyvinylidene fluoride into N-methylpyrrolidone, react at 80°C for 1 hour, then evenly coat it on the surface of the non-woven fabric to obtain a liquid film, and immediately immerse it in a 5g / L sodium chloride solution, The solvent is composed of ethanol and water, the volume ratio of ethanol and water is 9:1, take it out, wash it with deionized water, and obtain a polyvinylidene fluoride support membrane with a micro / nano-scale structure on the surface;

[0025] (2) Immerse the polyvinylidene fluoride membrane in an aqueous solution of 0.2g / L dopamine, 0.05g / L zinc nitrate hexahydrate and 0.2g / L chitosan, soak it at 40°C for 0.5h, and take it out to obtain a primary composite forward osmosis membrane ;

[0026] (3) Immerse the nascent composite forward osmosis membrane in a reactive mixed solution of 5g / L glutaraldehyde and 5g / L 2-methylimidazole, the solvent is composed of methanol and water, and the volume ratio of methanol to water is 9:1, After so...

Embodiment 2

[0030] (1) Add 30g of polyvinylidene fluoride to N,N'-dimethylformamide, react at 80°C for 24 hours, then evenly coat it on the surface of the non-woven fabric to obtain a liquid film, and immediately immerse it in 200g / L chlorine In the potassium chloride aqueous solution, the solvent is composed of ethanol and water, and the volume ratio of ethanol and water is 1:9, taken out, and washed with deionized water to obtain a polyvinylidene fluoride support film with a micro / nano-scale structure on the surface;

[0031] (2) Immerse the polyvinylidene fluoride membrane in an aqueous solution containing 10g / L dopamine, 1g / L zinc nitrate hexahydrate and 10g / L sodium alginate, take it out after soaking at 40°C for 24 hours, and obtain the primary composite forward osmosis membrane;

[0032] (3) Immerse the nascent composite forward osmosis membrane in a reactive mixed solution containing 50g / L sorbitol and 50g / L 2-methylimidazole, the solvent is composed of methanol and water, and the ...

Embodiment 3

[0035] (1) Add 15g of polyvinylidene fluoride to N,N'-dimethylacetamide, react at 80°C for 8 hours, then evenly coat it on the surface of the non-woven fabric to obtain a liquid film, and immediately immerse in 50g / L magnesium chloride In the solution, the solvent is composed of ethanol and water, the volume ratio of ethanol and water is 2:8, taken out, washed with deionized water, and obtained a polyvinylidene fluoride support membrane with a micro / nano-scale structure on the surface;

[0036] (2) Immerse the polyvinylidene fluoride membrane in an aqueous solution containing 1.5g / L dopamine, 0.5g / L zinc nitrate hexahydrate and 2g / L gelatin, take it out after soaking at 40°C for 2 hours, and obtain the primary composite forward osmosis membrane;

[0037] (3) Immerse the nascent composite forward osmosis membrane in a reactive mixed solution containing 10g / L malic acid and 10g / L 2-methylimidazole, the solvent is composed of methanol and water, and the volume ratio of methanol to...

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Abstract

The invention relates to the technical field of membrane separation, and provides a dopamine-assisted modified hybrid composite forward osmosis membrane and a preparation method thereof. The invention uses an aqueous solution containing inorganic salts and ethanol as a coagulation bath to regulate the phase separation speed and the crystallinity of polyvinylidene fluoride, construct a polyvinylidene fluoride membrane surface with a micro-nano structure, and endow the support membrane with large porosity and high specific surface area , to promote the rapid diffusion of salt solution in the membrane pores during forward osmosis, reduce concentration polarization, reduce membrane resistance, and increase water flux of forward osmosis membranes; use dopamine's super-adhesive properties and multi-active functional groups to convert hydrophilic Biomass materials and ZIF-8 are deposited on the surface of the support membrane at the same time to construct a defect-free hydrophilic hybrid selective skin layer and improve the salt rejection rate; ZIF-8 nanoparticles are generated in situ and uniformly dispersed in the skin layer to solve the problem of hybrid materials At the same time, the cavity inside ZIF-8 provides nano-water channels to ensure the salt rejection rate and improve water flux.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a dopamine-assisted modified hybrid composite forward osmosis membrane and a preparation method thereof. Background technique [0002] Common forward osmosis membranes are composite membranes prepared by interfacial polymerization, including porous support membranes and ultrathin polyamide selective skin layers. The classic interfacial polymerization process is to first immerse the support membrane in the aqueous phase solution of polyamine monomer, take out the membrane after a certain period of time and remove the excess aqueous phase solution on the surface of the membrane, and then immerse the sample into the oil phase containing acid chloride monomer In the solution, the two active monomers only react at the interface to form a polyamide skin layer, and after proper heat treatment, a composite forward osmosis membrane is obtained. In recent years, re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/82B01D69/12B01D69/02B01D67/00
CPCB01D71/82B01D69/12B01D69/02B01D67/0002B01D2325/02B01D2325/36
Inventor 陈郁栋傅敏
Owner 绍兴市俱和环保科技有限公司
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