Ion exchange composite film with selectivity on single cation

A cation-exchange membrane and cation-exchange technology, applied in the field of ion-exchange composite membrane preparation, can solve problems such as low flux and poor production efficiency, and achieve the effects of simple operation, stable separation performance, and good separation performance

Active Publication Date: 2014-05-14
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, ion-imprinted membranes are mostly made of polymers that do not have ion-conducting properties, and their applications are limited to diffusion dialysis. This ion separation method driven by the concentration difference on both sides of the membrane has low flux and poor production efficiency.
Literature search shows that before the completion of the present invention, no ion-exchange membrane was found as a base membrane, and the method for preparing an ion-exchange membrane with specific selectivity to a single cation by ion imprinting technology

Method used

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  • Ion exchange composite film with selectivity on single cation
  • Ion exchange composite film with selectivity on single cation
  • Ion exchange composite film with selectivity on single cation

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Using the LE-HoCM-0_SH sulfonic acid cation exchange membrane of Zhejiang Qianqiu Environmental Protection Water Treatment Co., Ltd. as the base membrane, the figure 1The four-chamber setup shown performs electrodeposition. The membrane to be deposited is fixed in the middle, and the two auxiliary membranes are cation exchange membranes. When energized, the two sides of the film to be deposited form a concentrated chamber and a dilute chamber respectively. Among them, the chamber near the anode is the dilute chamber, and the other side is the concentrated chamber. Add an aqueous solution with a sodium chloride concentration of 0.1mol / L and a polyethyleneimine concentration of 3g / L in the light chamber, add 0.1mol / L sodium chloride solution in the concentrated chamber, and use 1mol / L sodium chloride solution as the polar water , at a current of 4mA / cm 2 The deposition of polyethyleneimine on the film was completed for 120 min; the film deposited with polyethyleneimine...

Embodiment 2

[0042] This embodiment 2 refers to the method of embodiment 1. The difference is that during electrodeposition, the concentration of sodium chloride solution in the concentrated chamber and the dilute chamber on both sides of the cation exchange membrane to be deposited is 0.2mol / L, and the deposition current is 20mA / cm 2 , The electrodeposition time is 60min. Table 1 shows the separation effect of the product film on the copper-zinc mixed solution obtained under the same conditions described in Example 1 above.

Embodiment 3

[0044] This embodiment 3 refers to the method of embodiment 1. The difference is that the concentration of polyethyleneimine solution added to the dilute chamber during electrodeposition is 10 g / L, and the electrodeposition time is 60 minutes. Table 1 shows the separation effect of the product film on the copper-zinc mixed solution obtained under the same conditions described in Example 1 above.

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Abstract

The invention provides an ion exchange composite film with selectivity on a single cation as well as a preparation method and an application thereof. The composite film comprises a cation ion exchange base film and a polyethyleneimine modified layer, wherein the depositing amount of polyethyleneimine on the cation ion exchange base film is 2.0-200.0 g / m<2>; and the thickness of the ion exchange composite film is 50-500 microns. The single cation is Cu<2+>, Zn<2+>, Ni<2+>, Hg<2+>, Ag<2+>, Pt<2+>, Co<2+> and Cr<3+> and the ion exchange composite film can replace the common ion exchange composite films to be mounted in an electrodialyzer. The ion exchange composite film disclosed by the invention has the advantages of simple operation of a preparation method, green and non-toxic preparation process and adaptation to large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a preparation method and application of an ion-exchange composite membrane selective to a single cation. Background technique [0002] Membrane separation technology is regarded as a typical "green chemistry" because of its advantages of convenient continuous operation, easy scale-up, low energy consumption, and high energy utilization rate. The process has involved or hoped to apply membrane separation technology. The single cation selective separation membrane with excellent performance has broad application prospects in the resourceful extraction of rare metal ions in seawater, and the resourceful recovery and treatment of wastewater containing heavy metal or precious metal ions. Currently commercially available membranes that can achieve ion-selective separation mainly include ion-exchange membranes and nanofiltration membranes. The ion exchange membrane realize...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/60B01D69/12B01D67/00B01D61/44
Inventor 邓会宁张少峰刘燕陈佳媛孙晨
Owner HEBEI UNIV OF TECH
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