Preparing method and application of graphene-oxide-modified nanofiltration membrane

A graphene modification, nanofiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. The effect of water contact angle reduction

Inactive Publication Date: 2019-05-21
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the hydrophilicity and membrane permeability of the nanofiltration membrane prepared by this process are improved, the process is cumbersome and the cost of membrane production is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method for graphene oxide modified nanofiltration membrane, comprising the steps of:

[0023] (1) Prepare 100g of aqueous phase solution: the aqueous phase solution is based on the total mass, using 1.5g of sodium phosphate, 1g of anhydrous piperazine, 0.01g of graphene oxide GO, and then adding ultrapure water of corresponding quality;

[0024] (2) Prepare 100g of organic phase solution: add 0.25g of trimesoyl chloride to the container, and then add 99.75g of n-hexane, that is, the proportion of the organic phase solution is 0.25wt% of trimesoyl chloride and 99.75wt% of n-hexane;

[0025] (3) taking the polysulfone ultrafiltration membrane as the base membrane, immersing the aqueous phase solution described in step (1) on the upper surface of the base membrane to react for 1.5 minutes, pouring out the excess water phase, and drying;

[0026] (4) After immersing the organic phase solution described in step (2) in the upper surface of the base film through ...

Embodiment 2

[0031] A preparation method for graphene oxide modified nanofiltration membrane, comprising the steps of:

[0032] (2) Prepare 100g of aqueous phase solution: the aqueous phase solution is based on the total mass, using 1.5g of sodium phosphate, 0.7g of anhydrous piperazine, 0.2g of chitosan, 0.04g of graphene oxide GO, and then adding the corresponding quality of ultrapure water;

[0033] (2) Prepare 100g of organic phase solution: add 0.3g of trimesoyl chloride to the container, and then add 99.7g of n-hexane, that is, the proportion of the organic phase solution is 0.3wt% of trimesoyl chloride and 99.7wt% of n-hexane;

[0034] (3) taking the polysulfone ultrafiltration membrane as the base membrane, immersing the aqueous phase solution described in step (1) on the upper surface of the base membrane to react for 1.5 minutes, pouring out the excess water phase, and drying;

[0035] (4) After immersing the organic phase solution described in step (2) in the upper surface of t...

Embodiment 3

[0040] A preparation method for graphene oxide modified nanofiltration membrane, comprising the steps of:

[0041] (3) Prepare 100g of aqueous phase solution: the aqueous phase solution is based on the total mass, using 1.2g of sodium phosphate, 0.3g of disodium hydrogen phosphate, 1g of anhydrous piperazine, 0.06g of graphene oxide GO, and then adding the corresponding quality of ultrapure water;

[0042] (2) Prepare 100g of organic phase solution: add 0.35g of trimesoyl chloride to the container, and then add 99.65g of n-hexane, that is, the proportion of the organic phase solution is 0.35wt% of trimesoyl chloride and 99.65wt% of n-hexane;

[0043] (3) taking the polysulfone ultrafiltration membrane as the base membrane, immersing the aqueous phase solution described in step (1) on the upper surface of the base membrane to react for 3 minutes, pouring out the excess water phase, and drying;

[0044] (4) After immersing the organic phase solution described in step (2) in the...

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PUM

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Abstract

The invention discloses a preparing method of a graphene-oxide-modified nanofiltration membrane. The preparing method includes the steps that the surface of one side of a porous supporting membrane issubjected to an interfacial polymerization reaction in a water-phase solution, an organic phase solution and a water-phase solution in sequence, then the membrane is aired and subjected to a heat reaction to be soaked with ultra-pure water, and the graphene-oxide-modified nanofiltration membrane is prepared. The graphene-oxide-modified nanofiltration membrane is subjected to a polymerization reaction on the interface of one side of a porous support membrane, a polymer effective functional layer can be furthest generated, and the separation effect of the nanofiltration membrane is improved; meanwhile, a preparation process is simplified, and the cost is saved; a proper amount of graphene oxide (GO) is added into the water-phase solution, the hydrophilic performance, the membrane permeationperformance and the mechanical property of the nanofiltration membrane are greatly improved, the water contact angle of the nanofiltration membrane prepared with the method is reduced by 18% to 61%,the water flux is increased by 5% to 155%, and the reject rate is also increased. The graphene-oxide-modified nanofiltration membrane is simple in technology and easy to operate, and the graphene-oxide-modified nanofiltration membrane prepared with the method is applied to enrichment and recycling of water treatment and mineral-leaching tail-water ionic rare earth.

Description

technical field [0001] The invention belongs to the technical field of nanofiltration membrane preparation, and in particular relates to a preparation method of graphene oxide modified nanofiltration membrane. Background technique [0002] At present, the commonly used nanofiltration membrane is polyamide nanofiltration membrane. The manufacturing process of this membrane is complicated, the material is expensive, and the interception performance and water flux have not reached the use effect at the same time; moreover, the nanofiltration membrane will be affected by the membrane during use. Pollution, the residual chlorine in the water during regular cleaning will destroy the structure of the polyamide functional layer and affect the service life of the nanofiltration membrane. Therefore, how to improve the hydrophilicity of nanofiltration membranes, reduce costs, and increase their water flux and rejection has become an urgent problem to be solved. [0003] "Journal of Zh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D67/00C02F1/44C02F101/20
Inventor 李新冬代武川黄万抚袁佳彬李睿涵
Owner JIANGXI UNIV OF SCI & TECH
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