Preparation method of nanometer composite forward osmosis membrane with organic silane grafted multi-wall carbon nanometer tubes embedded into polyamide separation layer

A technology of carbon nanotubes and organosilanes, which is applied in the fields of semipermeable membrane separation, chemical instruments and methods, permeation/dialysis water/sewage treatment, etc., and can solve the problems of weakening the excellent properties of nanomaterials

Inactive Publication Date: 2017-11-28
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when synthesizing the polyamide active layer, som

Method used

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  • Preparation method of nanometer composite forward osmosis membrane with organic silane grafted multi-wall carbon nanometer tubes embedded into polyamide separation layer
  • Preparation method of nanometer composite forward osmosis membrane with organic silane grafted multi-wall carbon nanometer tubes embedded into polyamide separation layer
  • Preparation method of nanometer composite forward osmosis membrane with organic silane grafted multi-wall carbon nanometer tubes embedded into polyamide separation layer

Examples

Experimental program
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Effect test

Embodiment 1

[0032](1) 1g of multi-walled carbon nanotubes (diameter is 10~40nm, length is 5~15 μ m) is joined in the mixed acid solution of the concentrated sulfuric acid of 98% and the concentrated nitric acid of 65% in 100ml volume ratio, in React at 100°C for 12 hours, centrifuge the obtained reaction mixture, wash the obtained precipitate with deionized water until neutral, and dry it in vacuum to obtain 0.7 g of pretreated carbon nanotubes;

[0033] (2) Add 0.5 g of pretreated carbon nanotubes obtained in step (1) to 100 ml of thionyl chloride solvent, add 2 ml of N,N-dimethylformamide, and react at 100° C. for 72 hours. After the reaction, The obtained reaction mixture was centrifuged, and the obtained precipitate was washed with tetrahydrofuran, and vacuum-dried to obtain 0.55 g of modified carbon nanotubes;

[0034] (3) Add 0.5 g of the modified carbon nanotubes obtained in step (2) to 20 ml of toluene, ultrasonically disperse them for 4 hours, add 10 ml of γ-aminopropyltriethoxys...

Embodiment 2

[0039] (1) 1g of multi-walled carbon nanotubes (diameter is 10~40nm, length is 5~15 μm) is joined in the mixed acid solution of 98% concentrated sulfuric acid and 65% concentrated nitric acid that volume ratio is 1:1 in 300ml, in React at 180°C for 4 hours, centrifuge the obtained reaction mixture, wash the obtained precipitate with deionized water until neutral, and dry it in vacuum to obtain 0.65 g of pretreated carbon nanotubes;

[0040] (2) Add 0.6g of pretreated carbon nanotubes obtained in step (1) to 200ml of thionyl chloride solvent, add 2.5ml of N,N-dimethylformamide, and react at 180°C for 24h. After the reaction , the obtained reaction mixture was centrifuged, and the obtained precipitate was washed with tetrahydrofuran, and vacuum-dried to obtain 0.53 g of modified carbon nanotubes;

[0041] (3) Add 0.5 g of the modified carbon nanotubes obtained in step (2) to 20 ml of toluene, ultrasonically disperse for 4 hours, add 10 ml of γ-mercaptopropyltrimethoxysilane, and...

Embodiment 3

[0046] (1) 1g of multi-walled carbon nanotubes (diameter is 10~40nm, length is 5~15 μ m) is joined in the mixed acid solution of the concentrated sulfuric acid of 98% and the concentrated nitric acid of 65% in 100ml volume ratio, in React at 100°C for 12 hours, centrifuge the obtained reaction mixture, wash the obtained precipitate with deionized water until neutral, and dry it in vacuum to obtain 0.7 g of pretreated carbon nanotubes;

[0047] (2) Add 0.5 g of pretreated carbon nanotubes obtained in step (1) to 100 ml of thionyl chloride solvent, add 1.2 ml of N,N-dimethylformamide, and react at 100°C for 48 hours. , the obtained reaction mixture was centrifuged, and the obtained precipitate was washed with tetrahydrofuran, and vacuum-dried to obtain 0.61 g of modified carbon nanotubes;

[0048] (3) Add 0.5 g of the modified carbon nanotubes obtained in step (2) to 40 ml of toluene, ultrasonically disperse them for 4 hours, add 50 ml of γ-aminopropyltriethoxysilane, and react ...

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Abstract

The invention discloses a preparation method of a nanometer composite forward osmosis membrane with organic silane grafted multi-wall carbon nanometer tubes embedded into a polyamide separation layer. The carbon nanometer tube is added into concentrated acid to obtain the carbon nanometer tubes with carboxyls on the surface; thionyl chloride is used for acyl chlorization on the carbon nanometer tubes; further, reaction is performed with organic silane containing amino groups or sulfydryls; the organic silane is grafted onto the carbon nanometer tubes; macromolecular membrane materials are prepared into a porous organic filtering membrane; a thin separation layer is polymerized on the surface interface of a support layer of the porous organic filtering membrane; the organic silane grafted carbon nanometer tubes are used as nanometer filling materials to be added into an oil phase; the organic silane grafted carbon nanometer tubes are embedded into a separation layer to obtain a target product. The method provided by the invention has the advantages that the water flux of the product is greatly improved; the reverse diffusion quantity of a draw solution solute is reduced; in addition, good anti-pollution capability is shown; the membrane belongs to a novel forward osmosis membrane with a wide application potential.

Description

technical field [0001] The invention belongs to the field of polymer composite membranes, and in particular relates to a preparation method of nanocomposite forward osmosis in which grafted organosilane multi-wall carbon nanotubes are embedded in a polyamide separation layer. Background technique [0002] With the continuous increase of the world's population and increasingly serious environmental pollution, the shortage of drinking water resources has seriously threatened people's daily life. In recent years, scholars have focused on the use of membrane separation technology to desalinate to solve the drinking water crisis. Although reverse osmosis technology has achieved great success in seawater and brackish water desalination, its high energy consumption still raises concerns, especially when the energy comes from non-renewable resources. Unlike reverse osmosis, which requires external pressure as a driving force, forward osmosis uses different osmotic pressures on both ...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D67/00B01D61/00C02F1/44C08J5/18C08J9/28C08J7/04C08G69/26C08K9/06C08K9/02C08K7/24C08L81/06C08L33/20
CPCB01D61/002B01D67/0079B01D71/56C02F1/445C08G69/26C08J5/18C08J9/28C08J2333/20C08J2381/06C08J2477/10C08K7/24C08K9/02C08K9/06C08K2201/011C08J7/0427
Inventor 张国亮郑久汉苏鹏程
Owner ZHEJIANG UNIV OF TECH
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