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A kind of polyamide film layer composite reverse osmosis film and its preparation method and application

A technology of polyamide film and reverse osmosis, which is applied in the fields of chemical instruments and methods, osmosis/dialysis water/sewage treatment, membrane technology, etc., can solve the problems of complex modification steps, unfavorable commercial production, difficult regulation, etc., and achieve Effects of shortening the dissolution-diffusion path, optimizing the interfacial polymerization process, and reducing the intrinsic thickness

Active Publication Date: 2021-11-12
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods will inevitably have an adverse effect on the flux of the membrane.
In addition, the above modification methods are complicated in steps, difficult to control, low in efficiency, and unfavorable for commercial production, etc.

Method used

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  • A kind of polyamide film layer composite reverse osmosis film and its preparation method and application
  • A kind of polyamide film layer composite reverse osmosis film and its preparation method and application
  • A kind of polyamide film layer composite reverse osmosis film and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 30mg of Cu(NO 3 ) 2 ·3H 2 O, 15mg of terephthalic acid (H 2 BDC), 0.03mL of formic acid and 0.04mL of pyridine were dissolved in 5mL of N,N-dimethylacetamide solution to make solution A; 0.05mL of triethylamine was dissolved in 5mL of n-hexane to make solution B ; Slowly add solution A to the bottom of solution B through a syringe, seal it in a glass jar and react at room temperature for 15 hours, and synthesize ultra-thin metal-organic framework CuBDC through interfacial reaction; centrifuge at 8000rpm for 8 minutes to obtain a blue precipitate, which is washed repeatedly with acetone , remove the organic solvent residue in the metal-organic framework CuBDC, and vacuum-dry at 60°C to obtain the metal-organic framework CuBDC nanosheets for use;

[0036] dissolving the m-phenylenediamine solution in deionized water to form a m-phenylenediamine solution with a mass concentration of 2%;

[0037] Dissolving metal-organic framework CuBDC nanosheets in n-hexane to form Cu...

Embodiment 2

[0042] 40mg of Cu(NO 3 ) 2 ·3H 2 O. 16 mg of terephthalic acid, 0.05 mL of formic acid, and 0.01 mL of pyridine were dissolved in 5 mL of N,N-dimethylacetamide solution to form A solution; 0.05 mL of triethylamine was dissolved in 5 mL of n-hexane Prepare solution B in alkane; slowly add solution A to the bottom of solution B through a syringe, seal it in a glass jar and react at room temperature for 15 hours, and synthesize ultrathin metal organic framework CuBDC through interfacial reaction; centrifuge at 8000rpm for min to obtain a blue color Precipitate, wash repeatedly with acetone, remove the organic solvent residue in the ultra-thin metal-organic framework CuBDC, and dry it in vacuum at 60°C to obtain metal-organic framework CuBDC nanosheets for future use;

[0043] dissolving the m-phenylenediamine solution in deionized water to form a m-phenylenediamine solution with a mass concentration of 2.0%;

[0044] Dissolving metal-organic framework CuBDC nanosheets in n-hex...

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Abstract

The invention provides a polyamide film layer composite reverse osmosis membrane and its preparation method and application. First, an ultra-thin metal-organic framework CuBDC nanosheet with amphiphilic properties is prepared and placed on the water / oil two-phase interface. Among them, the water phase is an aqueous solution of m-phenylenediamine, and the oil phase is n-hexane. After the n-hexane is completely volatilized, the n-hexane solution containing trimesoyl chloride is slowly added to the interface to react to form a modified polyamide film layer. The thin film is carefully placed on the base of the ultrafiltration membrane to prepare a polyamide thin-layer composite reverse osmosis membrane. The intrinsic thickness of the polyamide film formed on the CuBDC-assisted free interface is about 5nm. The ultra-thin metal-organic framework nanosheets provide directionality for the thermal diffusion of the interfacial polymerization reaction, strengthen the intensity of the interfacial polymerization reaction, and improve the oil transfer of m-phenylenediamine. The rate of diffusion in the phase direction increases the surface area and cross-linking degree while forming an ultra-thin polyamide film, and greatly improves the flux and salt interception rate of the film.

Description

technical field [0001] The invention belongs to the technical field of reverse osmosis membranes for water treatment, and in particular relates to a composite reverse osmosis membrane containing a metal-organic framework CuBDC nanosheet polyamide film layer with an intrinsic thickness of 5nm to 10nm and a preparation method and application thereof. Background technique [0002] Reverse osmosis membrane separation technology is a new type of high-efficiency separation technology. It uses the principle of pressure drive to effectively achieve water / salt interception. It has been applied in many fields, such as brackish water treatment, seawater desalination, and pure water preparation. Polyamide thin-layer composite separation membrane has become a mainstream product in the field of reverse osmosis due to its good salt rejection rate and water flux, high stability, strong mechanical strength, and chemical corrosion resistance. However, in the application process of polyamide t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/56B01D69/02B01D69/12B01D67/00C02F1/44
Inventor 王志伟文越吴志超
Owner TONGJI UNIV
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