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Graphene oxide coating modified aromatic polyamide reverse osmosis membrane and preparation method thereof

An aromatic polyamide, reverse osmosis membrane technology, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve the problems of low water production, large external pressure, poor anti-pollution and anti-chlorine performance, etc. The effect of improving hydrophilicity, reducing energy consumption and improving chlorine resistance

Inactive Publication Date: 2016-08-10
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional polyamide polymer reverse osmosis membrane currently used mainly intercepts salt ions by manufacturing nanopores, and there are still many deficiencies in desalination performance, such as low water production of the membrane, poor anti-pollution and anti-chlorine performance. poor, the required external pressure is large, and there is still room for improvement in the desalination rate, etc.

Method used

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  • Graphene oxide coating modified aromatic polyamide reverse osmosis membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1. Substrate pretreatment of reverse osmosis membrane: Flatten the surface of the non-woven fabric with a flattening machine;

[0023] Step 2, preparing polysulfone (PSF) porous supporting layer: the preparation method includes the following processes:

[0024] 1) Mix 20wt.% PSF solid particles and 80wt.% N-methylpyrrolidone (NMP) solution, heat and stir at 50°C for 6h to form a uniform transparent PSF / NMP solution;

[0025] 2) The PSF / NMP solution is vacuum degassed until no visible bubbles are visible;

[0026] 3) Make the PSF / NMP solution form a film on the pretreated non-woven fabric substrate with a constant speed and thickness with an automatic film coating machine, and the film thickness is controlled at 50 μm;

[0027] 4) Immediately immerse the coated non-woven fabric in deionized water to solidify the PSF into a porous structure film and keep it for 24 hours;

[0028] 5) Dry in air at 60°C for 30 minutes before use;

[0029] Step 3, preparing the ultra...

Embodiment 2

[0048] Step 1. Substrate pretreatment of reverse osmosis membrane: Flatten the surface of the non-woven fabric with a flattening machine;

[0049] Step 2, preparing polysulfone (PSF) porous supporting layer: the preparation method includes the following processes:

[0050] 1) Mix 19wt.% PSF solid particles and 81wt.% N-methylpyrrolidone (NMP) solution, heat and stir at 55°C for 5h to form a uniform transparent PSF / NMP solution;

[0051] 2) The PSF / NMP solution is vacuum degassed until no visible bubbles are visible;

[0052] 3) Make the PSF / NMP solution form a film on the pretreated non-woven fabric substrate with a constant speed and thickness with an automatic film coating machine, and the film thickness is controlled at 100 μm;

[0053] 4) Immediately immerse the coated non-woven fabric in deionized water to solidify the PSF into a porous structure film for 24 hours;

[0054] 5) Dry in air at 70°C for 20 minutes before use;

[0055] Step 3, preparing polyamide ultra-thin...

Embodiment 3

[0073] Step 1. Substrate pretreatment of reverse osmosis membrane: Flatten the surface of the non-woven fabric with a flattening machine;

[0074] Step 2, preparing polysulfone (PSF) porous supporting layer: the preparation method includes the following processes:

[0075] 1) Mix 18wt.% PSF solid particles and 82wt.% N-methylpyrrolidone (NMP) solution, heat and stir at 60°C for 4 hours to form a uniform transparent PSF / NMP solution;

[0076] 2) The PSF / NMP solution is vacuum degassed until no visible bubbles are visible;

[0077] 3) Make the PSF / NMP solution form a film on the pretreated non-woven fabric substrate with a constant speed and thickness with an automatic film coating machine, and the film thickness is controlled at 200 μm;

[0078] 4) Immediately immerse the coated non-woven fabric in deionized water to solidify the PSF into a porous structure film for 24 hours;

[0079] 5) Dry at 80°C for 10 minutes in air atmosphere for use;

[0080] Step 3, preparing polyami...

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Abstract

The invention provides a graphene oxide coating modified aromatic polyamide reverse osmosis membrane and a preparation method thereof and belongs to the technical field of water treatment membrane preparation .The reverse osmosis membrane comprises a substrate supporting layer, a middle porous bearing layer, an ultra-thin compact separation layer and a graphene oxide coating .The thickness of the graphene oxide coating is 50-150 nm .The surface of the compact separation layer is coated with the graphene oxide, so that the salt removing rate, antifouling property and chlorine resistance of the composite reverse osmosis membrane can be effectively improved, and meanwhile needed working pressure is lowered.

Description

technical field [0001] The invention relates to an aromatic polyamide reverse osmosis membrane modified by a graphene oxide coating and a preparation method thereof, more specifically, coating graphene oxide on the surface of a dense separation layer of a reverse osmosis membrane, belonging to a water treatment membrane technology field. Background technique [0002] With the development of industry, water pollution and shortage of fresh water resources are one of the biggest challenges facing the world today. To solve the current serious freshwater crisis, seawater desalination has received more and more attention. At present, the main seawater desalination and desalination technologies include reverse osmosis, multi-effect distillation, multi-stage flash evaporation and electrodialysis. Among them, the reverse osmosis method using reverse osmosis membrane is the most energy-saving seawater desalination technology. However, the traditional polyamide polymer reverse osmos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D71/68B01D71/02B01D69/12B01D67/00
CPCB01D71/56B01D67/0079B01D69/12B01D71/021B01D71/68
Inventor 朱宏伟胡蕊蕊
Owner TSINGHUA UNIV
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