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A kind of iodane quaternized polypyrrole modified cation exchange membrane and its preparation and application

A technology of cation exchange membrane and iodane quaternary ammonium, which is applied in the field of mono/multivalent selective cation exchange membrane and its preparation, and can solve the problems such as separation rarely involved

Active Publication Date: 2021-07-27
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional electrodialysis process mainly focuses on the separation of non-homosexual ions, but rarely involves the separation of ions of the same sex but different valence states.

Method used

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  • A kind of iodane quaternized polypyrrole modified cation exchange membrane and its preparation and application
  • A kind of iodane quaternized polypyrrole modified cation exchange membrane and its preparation and application
  • A kind of iodane quaternized polypyrrole modified cation exchange membrane and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Iodane polypyrrole modified cation exchange membrane

[0031] Step 1: At room temperature (25-30°C, the same below), soak a CM-1Y cation exchange membrane of Tokuyama (Japan Tokuyama Soda Co., Ltd.) in 1mol / L sodium hydroxide aqueous solution for 2 hours, then take it out Repeatedly wash 5 times with deionized water to remove excess alkali on the surface, then soak in 1mol / L hydrochloric acid aqueous solution for 2 hours, take it out and repeatedly wash 5 times with deionized water to remove excess acid on the surface, and obtain acid-base activation After the cation exchange membrane.

[0032] Step 2: If figure 1 As shown, at room temperature, soak the activated cation exchange membrane in a 500ml beaker containing 20ml, 2mol / L pyrrole ethanol solution, let it stand for 90min until the pyrrole solution evaporates, then add 20ml, 0.5mol / L chloride Put the aqueous iron solution into a shaker and vibrate for 1 hour (frequency is 100 times / min), take out the membrane,...

Embodiment 2

[0038] The ethanol solution that the 5g / L methyl iodide in the step 3 of embodiment 1 is exchanged is the ethanol solution of 20g / L 1-iodohexane, all the other are the same as embodiment 1, obtain iodane quaternized polypyrrole modified cation exchange membrane.

[0039] Na was measured by the same method + / Mg 2+ The monovalent selectivity of the system, Na + relative to Mg 2 + The permselectivity value increased from 0.94 to 6.84 compared to the unmodified commercial membrane.

Embodiment 3

[0041] The ethanol solution of 5g / L methyl iodide in the embodiment 1 step 3 is changed into the ethanol solution of 1g / L iododecane, and all the other are with embodiment 1, make iodane quaternized polypyrrole single / multivalent selective cation exchange membrane.

[0042] Na was measured by the same method + / Mg 2+ The monovalent selectivity of the system, Na + relative to Mg 2+ The permselectivity value increased from 0.94 to 4.37 compared to the unmodified commercial membrane.

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Abstract

The invention discloses an iodane quaternized polypyrrole modified cation exchange membrane and its preparation and application. In the exchange membrane, the cation exchange membrane is sequentially soaked in an alkali solution and an acid solution, and washed with deionized water to obtain an acid-base membrane. Activated cation exchange membrane; soak the activated cation exchange membrane in the pyrrole solution, let it stand until the pyrrole solution is completely volatilized, then add the oxidant aqueous solution, shake, take out the membrane, and obtain the polypyrrole modified membrane; the polypyrrole modified membrane Immerse in the iodane solution for 1-24 hours, take out the membrane, and wash it with deionized water to obtain the iodane quaternized polypyrrole modified cation exchange membrane. The iodane quaternized polypyrrole modified cation exchange membrane prepared by the present invention is used for Na + The monovalent selective separation of Na + relative to Mg 2+ The permselectivity value increased from 0.94 to 6.84 compared to the unmodified commercial membrane.

Description

[0001] (1) Technical field [0002] The invention relates to a monovalent / multivalent selective cation exchange membrane and a preparation method thereof, in particular to a monovalent selective cation exchange membrane based on quaternized polypyrrole and a preparation method thereof. [0003] (2) Background technology [0004] Membrane separation technology is the core strength of my country's water security system. In the field of water treatment, a unique water treatment system including microfiltration, ultrafiltration, nanofiltration, reverse osmosis and electrodialysis has been formed. Various membrane water treatment technologies have their outstanding characteristics and advantages. Among them, electrodialysis technology has attracted much attention because of its high water recovery rate, long service life of equipment, low operating cost, and its irreplaceable advantages in the separation of non-homosexual ions and even homosexual ions. Electrodialysis is a technolo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J39/19
CPCB01J39/19
Inventor 潘杰峰逄霄郑瑜丁金成沈江南高从堦
Owner ZHEJIANG UNIV OF TECH