Polyamide composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and polyamide technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of low operating pressure and low removal efficiency, and achieve the effects of saving time, low cost, and simple preparation methods

Active Publication Date: 2020-03-17
XIAN TECHNOLOGICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nanofiltration membrane, especially with low operating pressure and low energy consumption, is a very potential membrane separation technology; however, its removal of heavy metal ions only relies on membrane pore size sieving and weak membrane surface charge, and its removal efficiency is low. Can not meet the requirements of human daily life and agricultural water

Method used

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  • Polyamide composite nanofiltration membrane and preparation method thereof
  • Polyamide composite nanofiltration membrane and preparation method thereof
  • Polyamide composite nanofiltration membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The present embodiment provides a kind of preparation method of polyamide composite nanofiltration membrane, comprises the following steps:

[0027] The first step: prepare the initial polyamide composite nanofiltration membrane; first select a polysulfone ultrafiltration membrane cut into a size of 17cm×10cm, fix it with a polytetrafluoroethylene frame as a support layer, and use the polysulfone ultrafiltration membrane with Rinse carefully with deionized water for 5 minutes; then prepare 50 mL of a mixed aqueous solution with a mass fraction of 0.35% piperazine and 0.24% sodium hydroxide, and stir until fully dissolved. Pour the mixed aqueous solution on the surface of the polysulfone base membrane, soak for 120s, filter off the excess liquid, dry the surface until there are no visible droplets on the surface, and quickly pour the n-hexane solution with a mass fraction of 0.3% trimesoyl chloride 50mL was fully infiltrated, and after the interfacial polymerization reac...

Embodiment 2

[0034] Prepare the initial polyamide composite nanofiltration membrane according to the steps and conditions given in the first step in Example 1, then configure the polyethyleneimine aqueous solution with a mass fraction of 1%, and mix it with the n-hexane of the remaining unreacted trimesoyl chloride Alkanes solution cross-linking polymerization, graft positively charged polyethyleneimine onto the initial polyamide composite nanofiltration membrane, after 10 minutes, pour off the excess liquid to obtain a polyamide composite nanofiltration membrane with saturated adsorption of polyethyleneimine ; Prepare a phytic acid solution with a mass fraction of 0.08%, and pour it on the polyamide composite nanofiltration membrane saturated with polyethylenimine, interact with positive and negative charges, and carry out an electrostatic assembly. After the assembly is carried out for 20 minutes, remove The excess solution was obtained to obtain a polyamide composite nanofiltration membr...

Embodiment 3

[0037] Prepare the initial polyamide composite nanofiltration membrane according to the steps and conditions given in the first step in Example 1, then configure the polyethyleneimine aqueous solution with a mass fraction of 1%, and mix it with the n-hexane of the remaining unreacted trimesoyl chloride Alkanes solution cross-linking polymerization, graft positively charged polyethyleneimine onto the initial polyamide composite nanofiltration membrane, after 10 minutes, pour off the excess liquid to obtain a polyamide composite nanofiltration membrane with saturated adsorption of polyethyleneimine ; Prepare a phytic acid solution with a mass fraction of 0.08%, and pour it on the polyamide composite nanofiltration membrane saturated with polyethylenimine, interact with positive and negative charges, and carry out an electrostatic assembly. After the assembly is carried out for 20 minutes, remove Excessive solution, obtain the polyamide composite nanofiltration membrane of phytic ...

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Abstract

Belonging to the technical field of nanofiltration membrane preparation and water treatment, the invention particularly relates to a phytic acid assembled polyamide composite nanofiltration membrane for efficient removal of metal ions in water and a preparation method thereof. A molecular layer-by-layer self-assembly method is adopted, through the electrostatic interaction with polyethylenimine molecules, a phytic acid monomer is introduced to the surface of a polyamide nanofiltration membrane so as to obtain the phytic acid assembled polyamide composite nanofiltration membrane. The inventionsolves the problem of low metal ion removal efficiency of the polyamide composite nanofiltration membrane in the prior art, and the prepared nanofiltration membrane has the advantages of high removalrate of metal ions in water, high separation speed, excellent cyclic regeneration performance, cheap and easily available raw materials, simple preparation process and no special requirements for equipment, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of nanofiltration membrane preparation and water treatment, and in particular relates to a polyamide composite nanofiltration membrane and a preparation method thereof. Background technique [0002] With the rapid development of modern industry, the crisis of water resources has become a very significant global problem, and has increasingly attracted people's attention. A large amount of wastewater is produced in various industrial production processes, usually including toxic metal ions and organic pollutant mixtures, which seriously threaten the natural environment and human health. It is particularly important to efficiently remove these toxic pollutants from wastewater. [0003] Usually, the methods for removing toxic metal ions in water include ion exchange, membrane separation, chemical precipitation and adsorption. Among them, membrane separation technology has the advantages of high removal efficie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12B01D69/02B01D71/56C02F1/44
CPCB01D67/0093B01D69/12B01D69/02B01D71/56B01D61/027C02F1/442B01D2325/36B01D2325/14
Inventor 张红梨陈卫星马爱洁张娜杨杰
Owner XIAN TECHNOLOGICAL UNIV
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