Reverse osmosis membrane, preparation method and application thereof

A technology of reverse osmosis membrane and porous filter membrane, which is applied in the field of material preparation technology and membrane separation, can solve the problem of no relevant research reports on reverse osmosis membrane, achieve excellent mechanical and chemical stability, achieve ultra-thin thickness and high quality, The effect of good mechanical strength

Inactive Publication Date: 2020-06-02
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still no relevant research reports on this new type of reverse osmosis membrane.

Method used

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  • Reverse osmosis membrane, preparation method and application thereof
  • Reverse osmosis membrane, preparation method and application thereof
  • Reverse osmosis membrane, preparation method and application thereof

Examples

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preparation example Construction

[0046] The embodiment of the present invention also provides a method for preparing the aforementioned reverse osmosis membrane, comprising:

[0047] (1) The dispersion of carbon nanotubes or carbon nanotubes modified by hydrophilic materials is loaded on the surface of the porous filter membrane to obtain a network of carbon nanotubes formed by interspersed stacking of carbon nanotubes or carbon nanotubes modified by hydrophilic materials membrane;

[0048] (2) dissolving polyamines in water, and preparing an aqueous phase solution with a concentration of 0.01g / L to 10g / L; dissolving polyacyl chlorides in an organic solvent, and preparing an organic phase solution with a concentration of 0.001g / L to 10g / L;

[0049] (3) the surface of the carbon nanotube film is contacted with the aqueous solution, and the aqueous solution remaining on the surface of the carbon nanotube film is removed after the aqueous solution completely wets the surface of the carbon nanotube film; The sur...

Embodiment 1

[0066] The polydopamine-modified single-walled carbon nanotubes were loaded onto a polyethersulfone microfiltration membrane with a pore size of 0.22 μm by brushing to obtain a carbon nanotube membrane with a thickness of about 80 nm and an effective pore size of about 30 nm. Prepare an aqueous solution of m-phenylenediamine with a concentration of 0.1 g / L, and a solution of trimesoyl chloride-n-hexane with a concentration of 0.1 g / L. Put the carbon nanotube membrane loaded on the polyethersulfone microfiltration membrane in the m-phenylenediamine solution for 60 seconds, remove the excess m-phenylenediamine solution on the membrane surface with an air knife after taking out the membrane, and then place the membrane in a homobenzene Triformyl chloride solution for 60 seconds. After taking out the membrane, wash the membrane with n-hexane to remove excess trimesoyl chloride solution on the membrane surface. The membrane was heat-treated at 90° C. for 2 minutes to finally obtai...

Embodiment 2

[0069] The polydopamine-modified double-walled carbon nanotubes were loaded onto a polyethersulfone microfiltration membrane with a pore size of 0.22 μm by brushing to obtain a carbon nanotube membrane with a thickness of about 80 nm and an effective pore size of about 30 nm. Prepare an aqueous solution of m-phenylenediamine with a concentration of 2 g / L, and a solution of trimesoyl chloride-n-hexane with a concentration of 0.1 g / L. Put the carbon nanotube membrane loaded on the polyethersulfone microfiltration membrane in the m-phenylenediamine solution for 60 seconds, remove the excess m-phenylenediamine solution on the membrane surface with an air knife after taking out the membrane, and then place the membrane in a homobenzene Triformyl chloride solution for 30 seconds. After taking out the membrane, wash the membrane with n-hexane to remove excess trimesoyl chloride solution on the membrane surface. Heat-treat the membrane at 90 °C for 2 min, place the membrane in 0.1 g / ...

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Abstract

The invention discloses a reverse osmosis membrane, a preparation method and application thereof. The reverse osmosis membrane comprises a porous filter membrane supporting layer, a carbon nanotube membrane middle layer and a polyamide membrane selection layer which are arranged in sequence. According to the invention, the reverse osmosis membrane is a stable composite membrane integrating a porous filter membrane, a carbon nano tube membrane and a polyamide membrane, wherein the porous filter membrane serves as the substrate loaded by the carbon nano tube membrane and provides good mechanicalstrength, the carbon nano tube membrane has uniformly distributed nano-sized apertures and high porosity, and is used as a support for an interfacial polymerization reaction so as to achieve uniformdistribution of a monomer solution and controllable release of a monomer to prepare an ultrathin and high-quality polyamide membrane, and the polyamide membrane as a performance determination layer has the characteristic of ultra-thinness, and makes the novel reverse osmosis membrane have the flux far higher than that of the traditional reverse osmosis membrane while retaining the high rejection rate. According to the reverse osmosis membrane disclosed by the invention, the carbon nano tube membrane middle layer with uniformly distributed nano-sized apertures and high porosity is introduced for the first time, so that the performance is substantially improved.

Description

technical field [0001] The invention relates to a reverse osmosis membrane with a stable structure of a porous filter membrane support layer, a carbon nanotube membrane middle layer and a polyamide membrane selective layer, as well as its preparation process and application, and belongs to the fields of material preparation technology and membrane separation technology. Background technique [0002] As the core of reverse osmosis technology, reverse osmosis membrane has a huge application market in seawater desalination, brackish water desalination, drinking water purification, industrial sewage treatment, hemodialysis and other fields. The demand for reverse osmosis membrane components and reverse osmosis equipment is increasing year by year Increase. At present, the amount of fresh water produced by reverse osmosis membranes in the world reaches 2×10 7 Ton. According to the survey data of the Institute of Membrane Materials of Advanced Industry Research, China's reverse ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D69/12B01D67/00B01D61/02B01D69/02C02F1/44A61M1/16C02F103/08
CPCB01D69/12B01D69/10B01D69/02B01D67/0006B01D67/0079B01D61/025C02F1/441A61M1/16C02F2103/08Y02A20/131
Inventor 靳健高守建朱玉长
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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