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Preparation method of monovalent ion selective composite film based on template method

An ion-selective, composite membrane technology, applied in the field of membrane separation, can solve the problems of poor stability and low flux, and achieve the effects of stable separation performance, simple operation and wide application range

Active Publication Date: 2015-12-02
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a monovalent ion-selective composite membrane based on the template method and its preparation method for the shortcomings of low flux and poor stability in the current layer-by-layer self-assembly composite membrane preparation technology

Method used

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  • Preparation method of monovalent ion selective composite film based on template method
  • Preparation method of monovalent ion selective composite film based on template method
  • Preparation method of monovalent ion selective composite film based on template method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The polyacrylonitrile (PAN) flat ultrafiltration membrane with a molecular weight cut-off of 50,000 is used as the base membrane, polyethyleneimine (PEI) is the polycation, the polyanion used is polyacrylic acid (PAA), and nickel ions are used as template ions. The multivalent ion selective composite membrane is used to separate the concentrated seawater discharged after seawater desalination.

[0034] Assembly conditions and methods:

[0035] The first step is to prepare a 0.023mol / L nickel nitrate solution, and then prepare a 1g / L polyethyleneimine (PEI) solution with an equimolar concentration. Cationic electrolyte polyethylenimine (PEI) concentration is the chelating solution (solution A) of 0.8g / L, then the molar ratio of template nickel ion in this solution and amino group in polyethyleneimine (PEI) solution is 1:4 . Prepare a 0.8 g / L polyacrylic acid (PAA) solution for self-assembly.

[0036] In the second step, polyelectrolyte is deposited layer by layer self...

Embodiment 2

[0049] The polyacrylonitrile (PAN) flat ultrafiltration membrane with a molecular weight cut-off of 50,000 is used as the base membrane, polyethyleneimine is the polycation, the polyanion used is polyacrylic acid, and nickel ions are used as template ions to prepare mono-multivalent ion selective compounding. Membranes are used to separate concentrated seawater discharged after seawater desalination.

[0050] Assembly conditions and methods:

[0051] The first step is to prepare a 0.23mol / L nickel nitrate solution, and then prepare a 10g / L polyethyleneimine (PEI) solution with an equimolar concentration. Cationic electrolyte polyethyleneimine (PEI) concentration is the chelating solution (solution A) of 9.52g / L, then the molar ratio of template nickel ion in this solution and the amine group in polyethyleneimine (PEI) solution is 1:20 . Prepare 9.52g / L polyacrylic acid (PAA) solution for self-assembly.

[0052] In the second step, polyelectrolyte is deposited layer by layer...

Embodiment 3

[0063] The polyacrylonitrile (PAN) flat ultrafiltration membrane with a molecular weight cut-off of 50,000 is used as the base membrane, polyethyleneimine is the polycation, the polyanion used is polyacrylic acid, and nickel ions are used as template ions to prepare mono-multivalent ion selective compounding. Membranes are used to separate concentrated seawater discharged after seawater desalination.

[0064] Assembly conditions and methods:

[0065] The first step is to prepare a 0.069mol / L nickel nitrate solution, and then prepare a 3g / L polyethyleneimine (PEI) solution with an equimolar concentration. Cationic electrolyte polyethyleneimine (PEI) concentration is the chelating solution (solution A) of 2.85g / L, then the molar ratio of template nickel ion in this solution and the amine group in polyethyleneimine (PEI) solution is 1:20 . Prepare 2.85g / L polyacrylic acid (PAA) solution for self-assembly.

[0066] In the second step, polyelectrolyte is deposited layer by layer...

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Abstract

The invention provides a preparation method of a monovalent ion selective composite film based on a template method. The method comprises the following steps of firstly, preparing polycation electrolyte aqueous solution A containing template ions and polyanion electrolyte aqueous solution B for self assembling; secondly, soaking a pretreated basal film in the solution A, flushing after soaking, then soaking the pretreated basal film in the solution B, flushing in the same way to finish two-layer assembling, and repeatedly soaking until the final assembling layers are 2-30; thirdly, placing the composite film in solution of a cross-linking agent to perform crosslinking after the composite film is subjected to self assembling layer by layer; and finally, soaking the prepared composite film by using diluted hydrochloric acid and the like to obtain the monovalent ion selective composite film based on the template method. The monovalent ion selective composite film can be used for conveniently separating monovalent sodium ions and monovalent potassium ions in seawater from polyvalent calcium ions and polyvalent magnesium ions in the seawater, and is stable in separation property and wide in application range.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, in particular to a preparation method of a monovalent ion selective composite membrane based on a template method. Background technique [0002] As a new type of separation method, membrane separation has the characteristics of small investment, less land occupation, no pollution, high efficiency, and energy saving. Membranes for separation require both high selectivity and high flux. The composite membrane is composed of a porous support layer that provides mechanical strength and an active separation surface layer. The composite membrane uses different materials to prepare the support layer and the surface active layer, which provides a wider space for the selection of membrane materials and performance optimization. The selectivity and flux of the composite membrane are the key factors to characterize the separation performance of the membrane, and the separation membrane requires...

Claims

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Application Information

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IPC IPC(8): B01D71/42B01D69/10B01D67/00
Inventor 邓会宁卞玲玲胡柏松张少峰
Owner HEBEI UNIV OF TECH
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