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Dopamine-assisted modified hybrid composite forward osmosis membrane 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: 2020-04-14
绍兴市俱和环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Dopamine-assisted modified hybrid composite forward osmosis membrane and preparation method thereof

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Experimental program
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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, and the volume ratio of ethanol and water is 2:8, taken out, washed with deionized water, and obtained a polyvinylidene fluoride support film 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. An aqueous solution containing inorganic salt and ethanol is used as a coagulating bath; the phase separation speed and the crystallinity of polyvinylidene fluoride are regulated and controlled, a polyvinylidene fluoride membrane surface with a micro-nano structure is constructed, the supporting membrane is endowed with large porosity and high specific surface area, rapid diffusion of a salt solution in membrane pores in the forward osmosis process is promoted, concentration polarization is reduced, membrane resistance is reduced, and the water flux of the forward osmosis membrane is increased; the preparation method comprises the following steps: simultaneously depositing a hydrophilic biomass material and ZIF-8 on the surface of the supporting membrane by utilizing the super-strong adhesion characteristic and multi-active functional groups of dopamine to construct a defect-free hydrophilic hybrid selective cortex and improve the salt rejection rate; ZIF-8 nano particles are generated in situ anduniformly dispersed in the cortex, so that the problem of interfacial compatibility of the hybrid material is solved, and meanwhile, a nano water channel is provided by a cavity in ZIF-8, so that thewater flux is improved while the salt rejection rate is ensured.

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 Applications(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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