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Method for producing nano-polyaniline modified aromatic polyamide composite reverse osmosis membrane

A nano-polyaniline, aromatic polyamide technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of small flux, poor chlorine resistance, etc. Simple, reduced attack effect

Inactive Publication Date: 2018-03-23
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the shortcomings of current organic reverse osmosis membranes, such as low flux and poor chlorine resistance, and proposes a method for preparing a nano-polyaniline-modified aromatic polyamide composite reverse osmosis membrane

Method used

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  • Method for producing nano-polyaniline modified aromatic polyamide composite reverse osmosis membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add the intrinsic state nano-PANI with a molecular weight of 10000 into the IsoparG solvent, ultrasonically disperse for 1 hour, and obtain a uniform dispersion with a concentration of 0.1%. Soak in (MPD) triethylamine aqueous solution for 120 seconds; then roll the polysulfone support membrane with a rubber roller to remove excess solution; after the solution is dry, spread the polyaniline dispersion evenly on the surface of the membrane, and then disperse The completed organic phase solution was contacted for 20 seconds; then contacted with a mass concentration of 0.1% trimesoyl chloride (TMC) organic phase solution for 50 seconds, the film was placed in a vacuum oven at 90°C for 15 minutes, and dried to obtain a hybrid Reverse osmosis composite membrane. Using 2000ppm sodium chloride aqueous solution to test the initial performance of the membrane under the pressure of 1MPa, the desalination rate of the membrane is 96.8%, and the flux is 50.15L / h / m 2 .

Embodiment 2-6

[0025] Except that the mass concentration of nano-polyaniline is different in the steps, the other steps are the same as in Example 1, and the composite film is prepared and tested, and the results are as follows:

[0026] Example

Embodiment 7

[0028] Add the intrinsic state nano-PANI with a molecular weight of 30000 into the IsoparG solvent, and disperse it ultrasonically for 3 hours to obtain a uniform dispersion with a concentration of 0.05%; Soak in (MPD) triethylamine aqueous solution for 120 seconds; then roll the polysulfone support membrane with a rubber roller to remove excess solution; after the solution is dry, spread the polyaniline dispersion evenly on the surface of the membrane, and then disperse The completed organic phase solution was contacted for 30 seconds; then contacted with a mass concentration of 0.08% trimesoyl chloride (TMC) organic phase solution for 60 seconds, the film was placed in a vacuum oven at 80°C for 10 minutes, and dried to obtain a hybrid Reverse osmosis composite membrane. Using 2000ppm sodium chloride aqueous solution to test the initial performance of the membrane under the pressure of 1MPa, the desalination rate of the membrane is 95.5%, and the flux is 31.54L / h / m 2 .

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Abstract

The invention discloses a technology for producing a composite membrane, and concretely relates to a method for producing a nano-polyaniline modified aromatic polyamide composite reverse osmosis membrane. The method comprises the following steps: preparing a nano-polyaniline organic phase dispersion, immersing a polysulfone support membrane in an aqueous m-phenylenediamine (MPD) solution, and rolling the MPD solution immersed polysulfone support membrane by a rubber roller to remove the superfluous solution; and allowing the obtained polysulfone support membrane to become dry and then to contact with the ultrasonically-dispersed nano-polyaniline organic phase dispersion, removing the superfluous dispersion, allowing the obtaiend polysulfone support membrane to contact with a trimesoyl chloride (TMC) organic phase soltuion, and drying the above obtained membrane in a vacuum oven to obtain the nano-polyaniline modified aromatic polyamide composite reverse osmosis membrane. Polyaniline nano-particles are organic matters having a good mechanical strength, and provide a compatible and solid support structure for a polyamide separation layer, so the water flux is improved on the premiseof guaranteeing no change of the sodium chloride rejection rate of the polyamide composite reverse osmosis membrane.

Description

technical field [0001] The invention relates to a preparation process of a composite membrane, in particular to a preparation method of a nano-polyaniline modified aromatic polyamide composite reverse osmosis membrane. Background technique [0002] In recent years, people have been devoting themselves to developing new membrane materials or modifying existing reverse osmosis membranes. At present, the separation layer of commercial composite reverse osmosis membranes is generally cross-linked aromatic polyamide, which is easily oxidized by active chlorine in water, resulting in a sharp decline in the performance of the reverse osmosis membrane. The shortcomings of reverse osmosis membrane such as low anti-oxidation capacity, low rejection rate and low flux have seriously restricted the wider application of reverse osmosis technology in the fields of seawater and brackish water desalination, water reuse, wastewater treatment and resource utilization. It poses great challenge...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D71/56B01D71/40B01D69/12B01D69/02B01D67/00B01D61/02
CPCB01D71/68B01D61/025B01D67/0002B01D69/02B01D69/12B01D71/40B01D71/56B01D2325/24B01D2325/36
Inventor 李洪懿陈可可潘巧明刘文超洪勇琦高从堦
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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