Preparation method for novel carbon-nanotube-doped composite membrane with double selective layers

A technology of carbon nanotubes and double selection, which is applied in the field of preparation of new double-selection layer composite membranes containing carbon nanotubes, which achieves the effects of simple preparation method, improved membrane performance, and wide application prospects

Inactive Publication Date: 2015-11-04
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although adding carbon nanotubes to the forward osmosis membrane can improve the water flux of the membrane, the concentration polarization phenomenon is still inevitable during the forward osmosis test. Therefore, a new type of composite membrane containing carbon nanotubes is developed to make it A new type of composite membrane with high water flux and rejection while effectively reducing concentration polarization in the process of forward osmosis is the core of the development of forward osmosis technology

Method used

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  • Preparation method for novel carbon-nanotube-doped composite membrane with double selective layers
  • Preparation method for novel carbon-nanotube-doped composite membrane with double selective layers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Put the polysulfone base membrane in 100ml of dopamine hydrochloride (2mg / ml) Tris buffer solution with pH=8.5, react with constant temperature shaking at 30°C for 12h, and let it stand for 6h to obtain the polysulfone base membrane with dopamine attached to the surface; after taking out the base membrane Drain in the air, use the method of interfacial polymerization to immerse the surface (top) of the basement film in the n-hexane solution of 0.1w / v% trimesoyl chloride (TMC), the reaction time is 5min, and then the bottom surface of the basement film (bottom) Immerse in TMC solution for 5min to react, and then treat in 80°C blast drying oven for 5min to obtain a double-selective layer composite membrane. figure 1 It is a scanning electron microscope image of the surface of the carbon nanotube-containing double selective layer composite film prepared in Example 1 of the present invention. figure 2 It is a scanning electron microscope picture of the bottom surface of th...

Embodiment 2

[0030] Add 0.01g of carbon nanotubes (CNTs) to 100ml of dopamine hydrochloride (2mg / ml) Tris buffer solution with pH = 8.5, ultrasonically disperse the CNTs for 1h, place the polysulfone-based membrane in the above solution, and keep the temperature at 30°C Shake the reaction for 12 hours and let it stand for 6 hours to obtain a polysulfone-based membrane with CNTs and dopamine attached to the surface; take out the basement membrane and drain it in the air, and immerse the surface (top) of the basement membrane in 0.1w / v % in the n-hexane solution of trimesoyl chloride (TMC), the reaction time is 5min, and then the basement film bottom surface (bottom) is immersed in the TMC solution for 5min, and then processed for 5min in an air-blow oven at 80°C to obtain Double selective layer composite membrane containing carbon nanotubes. To measure the performance of the membrane, 4mol / L glucose is used as the draw solution (DS), and 0.1mol / L NaCl is used as the feed solution (FS). When...

Embodiment 3

[0032] Add 0.05g of carbon nanotubes (CNTs) to 100ml of dopamine hydrochloride (2mg / ml) Tris buffer solution with pH = 8.5, ultrasonically disperse the CNTs for 1h, place the polysulfone-based membrane in the above solution, and keep the temperature at 30°C Shake the reaction for 12 hours and let it stand for 6 hours to obtain a polysulfone-based membrane with CNTs and dopamine attached to the surface; take out the basement membrane and drain it in the air, and immerse the surface (top) of the basement membrane in 0.1w / v % in the n-hexane solution of trimesoyl chloride (TMC), the reaction time is 5min, and then the basement film bottom surface (bottom) is immersed in the TMC solution for 5min, and then processed for 5min in an air-blow oven at 80°C to obtain Double selective layer composite membrane containing carbon nanotubes. To measure the performance of the membrane, 4mol / L glucose is used as the draw solution (DS), and 0.1mol / L NaCl is used as the feed solution (FS). When...

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Abstract

The invention relates to a preparation method for a novel carbon-nanotube-doped composite membrane with double selective layers. The preparation method specifically comprises the following steps of: (1) preparing a base membrane; (2) putting the prepared base membrane into a dopamine solution containing a carbon nanotube to carry out oscillating reaction to obtain a base membrane which is adhered with carbon-nanotube-containingpolydopamine composite layers in membrane surface and membrane bottom surface; (3) draining off the base membrane, which is adhered with carbon-nanotube-containingpolydopamine composite layers in membrane surface and membrane bottom surface, obtained in the step (2), then, soaking the base membrane into a trimesoyl chloride solution, and adopting an interface polymerization method to obtain a composite membrane with double selective layers; and (4) carrying out thermal treatment on the composite membrane in the step (3), thereby obtaining the carbon-nanotube-containing composite membrane with double layers. According to the preparation method, the structure of the base membrane is not damaged, so that the base membrane not only can be suitable for a flat sheet membrane, but also can be prepared into a hollow fiber membrane; water molecule channels are greatly increased; the antifouling property of the membrane is improved; and the service life of the membrane is prolonged. The preparation method is simple.

Description

technical field [0001] The invention belongs to the field of preparing separation membrane composite materials, and in particular relates to a method for preparing a novel double-selective layer composite membrane containing carbon nanotubes. Background technique [0002] In recent years, membrane separation technology is an effective way to obtain drinking water. Among them, forward osmosis technology is an emerging technology with significant advantages of low-pressure operation, low energy consumption and low pollution, so it has been widely used in many fields. If nanomaterials, molecular sieves, carbon materials, graphene oxide, metal oxides, etc. are added to the membrane, the membrane performance can be greatly improved. As an ideal channel for water molecules, carbon nanotubes have a single selective permeability and can improve the mechanical strength and anti-fouling performance of the membrane. Therefore, carbon nanotubes have received great attention in the field...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D71/06B01D69/12B01D69/02B01D67/00
Inventor 王志宁宋向菊王莅王涛高翔
Owner OCEAN UNIV OF CHINA
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