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High-flux positive osmosis membrane based on ultrathin support layer and preparation method thereof

A forward osmosis membrane and thin layer technology, applied in the field of separation membrane composite materials, can solve problems such as hindering the development of forward osmosis membrane separation technology and unsatisfactory water flux, and achieve the effect of reducing the degree of internal concentration polarization and improving performance

Inactive Publication Date: 2014-12-03
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the only commercialized forward osmosis membranes are cellulose triacetate forward osmosis membranes and thin-layer composite forward osmosis membranes produced by Hydration Technology Inc. of the United States. Although the membrane performance has been greatly improved, the internal concentration polarization phenomenon still remains More serious, water flux is still not ideal
It can be seen that internal concentration polarization has become a bottleneck hindering the further development of forward osmosis membrane separation technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Prepare a 0.1 g / L single-walled carbon nanotube solution in a 1 g / L sodium dodecylbenzenesulfonate solution, ultrasonically disperse it at room temperature for 10 h, and centrifuge it in a centrifuge at a speed of 10,000 r / min After 30 min, the carbon nanotube supernatant was collected; the mixed fiber microfiltration membrane with a pore size of 0.1 μm was used as the bottom membrane, fixed in a suction filter bottle, and 1 ml of the carbon nanotube supernatant was pipetted for suction filtration to obtain the mixed fiber microfiltration membrane. The carbon nanotube membrane supported by the microfiltration bottom membrane was dried at 30 °C for 3 h before use; the carbon nanotube membrane was placed in acetone, and the porous microfiltration bottom membrane was dissolved and removed to obtain a self-supporting carbon nanotube membrane; Placed on the surface of 20 g / L m-phenylenediamine aqueous solution (pH 8.0), and then uniformly introduced 0.8 g / L trimesoyl chloride...

Embodiment 2

[0020] Prepare a 0.1 g / L single-walled carbon nanotube solution in a 1 g / L sodium dodecylbenzenesulfonate solution, ultrasonically disperse it at room temperature for 10 h, and centrifuge it in a centrifuge at a speed of 10,000 r / min After 30 min, the carbon nanotube supernatant was collected; the mixed fiber microfiltration membrane with a pore size of 0.1 μm was used as the bottom membrane, fixed in a suction filter bottle, and 5 ml of the carbon nanotube supernatant was pipetted for suction filtration to obtain the mixed fiber microfiltration membrane. The carbon nanotube membrane supported by the microfiltration bottom membrane was dried at 30 °C for 3 h before use; the carbon nanotube membrane was placed in acetone, and the porous microfiltration bottom membrane was dissolved and removed to obtain a self-supporting carbon nanotube membrane; Place on the surface of 20 g / L m-phenylenediamine aqueous solution (pH 8.0), and then uniformly introduce 0.8 g / L trimesoyl chloride s...

Embodiment 3

[0023] Prepare a 0.1 g / L single-walled carbon nanotube solution in a 1 g / L sodium dodecylbenzenesulfonate solution, ultrasonically disperse it at room temperature for 10 h, and centrifuge it in a centrifuge at a speed of 10,000 r / min After 30 min, the carbon nanotube supernatant was collected; the mixed fiber microfiltration membrane with a pore size of 0.22 μm was used as the bottom membrane, fixed in a suction filter bottle, and 5 ml of the carbon nanotube supernatant was pipetted for suction filtration to obtain the mixed fiber microfiltration membrane. The carbon nanotube membrane supported by the microfiltration bottom membrane was dried at 30 °C for 3 h before use; the carbon nanotube membrane was placed in acetone, and the porous microfiltration bottom membrane was dissolved and removed to obtain a self-supporting carbon nanotube membrane; Placed on the surface of 20 g / L m-phenylenediamine and 20 g / L triethylamine aqueous solution (pH 8.0), and then uniformly introduced ...

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Abstract

The invention provides a thin layer composite positive osmosis membrane and a preparation method of the thin layer composite positive osmosis membrane, aiming at effectively reducing concentration polarization in positive osmosis and greatly improving the water flux. The invention provides a thin layer composite positive osmosis membrane containing an ultrathin support layer, and a preparation method of the thin layer composite positive osmosis membrane, so that the defects of the prior art are made up. The ultrathin support layer of the thin layer composite positive osmosis membrane is a self-support carbon nano tube support layer or a hydrophilic modification carbon nano tube support layer; a skin layer of the thin layer composite positive osmosis membrane is a polyamide layer compounded on the surface of the self-support carbon nano tube layer. Due to the good support layer structure of the self-support carbon nano tube layer, a brand new thin layer composite positive osmosis membrane concept is provided, so that a new way of a high-performance positive osmosis membrane is opened up at home and abroad. Furthermore, the operation of interfacial polymerization is completed on the surface of the self-support carbon nano tube layer, the positive osmosis membrane with remarkably improved performances can be obtained, and a new thought is provided for the preparation of other novel materials.

Description

technical field [0001] The invention belongs to the field of separation membrane composite materials, and specifically relates to a high-flux forward osmosis membrane and a preparation method thereof, that is, a forward osmosis membrane obtained by using a carbon nanotube layer as a support layer and directly performing interfacial polymerization on its surface and a preparation method thereof . Background technique [0002] Forward osmosis technology is a membrane separation process driven only by osmotic pressure. Water molecules spontaneously permeate through a semipermeable membrane from a raw material solution with a high water chemical potential to a draw solution with a low water chemical potential. Compared with reverse osmosis technology, forward osmosis has the following advantages: no external pressure, more energy-saving; higher water recovery rate; no concentrated brine discharge, environmentally friendly; lower membrane pollution. The forward osmosis membrane ...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D69/10B01D69/12B01D67/00
Inventor 徐佳唐媛媛李盼盼张丽丽高从堦
Owner OCEAN UNIV OF CHINA
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