Method for preparing mono-/multi-valent ion exchange membrane by membrane fouling and electrodialysis deposition

An ion exchange membrane and multivalent ion technology, which is used in the field of membrane fouling-electrodialysis deposition to prepare a multivalent ion exchange membrane, can solve the problems of easy peeling off of the surface skin, poor long-term stability, low selection coefficient, etc., and achieves a wide range of raw material sources. , the effect of high limiting current density and low film resistance

Active Publication Date: 2018-11-30
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Usually, the special separation membranes obtained by the above-mentioned different methods have some disadvantages, such as low selectivity, high membrane resistance, easy peeling off of the surface skin, poor long-term stability, etc. There are still many problems in large-scale industrialization

Method used

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  • Method for preparing mono-/multi-valent ion exchange membrane by membrane fouling and electrodialysis deposition
  • Method for preparing mono-/multi-valent ion exchange membrane by membrane fouling and electrodialysis deposition
  • Method for preparing mono-/multi-valent ion exchange membrane by membrane fouling and electrodialysis deposition

Examples

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Embodiment 1

[0035] In this example, the commercialized Neosepta AMX membrane was polluted with sulfonated polyphenylene ether (SPPO) to obtain a multivalent anion selective permeation membrane with selective permeation ability for monovalent ions. The specific steps are as follows:

[0036] 1. Preparation of the target pollutant solution: 1 g of sulfonated polyphenylene ether (SPPO) with a sulfonation degree of 28% was dissolved in 35 mL of nitrogen-nitrogen dimethylformamide (DMF), magnetically stirred until the SPPO was completely dissolved, and then Add deionized water to the solution and dilute to 500mL; take 5mL of NaCl solution with a concentration of 0.5mol / L and add it to the sulfonated polyphenylene ether solution, stir magnetically until the solution is uniformly dispersed, and then continue to add deionized water to dilute to 1000mL.

[0037] 2. Assemble the electrodialysis device: such as figure 1As shown, the electrodialysis device is based on the anode plate, silica gel gask...

Embodiment 2

[0047] In this embodiment, a multivalent anion selective permeable membrane is prepared in the same manner as in Example 1, the difference is that in step 4, 30mA / cm 2 current.

[0048] Through characterization and testing, the selectivity coefficient of the anion exchange membrane (MAEM-10) after the modification of the present embodiment is shown in Table 1, and the geometric structure of the surface is as follows image 3 As shown, the infrared spectrum is shown as Figure 4 As shown, the I-V curve is shown as Figure 5 shown.

Embodiment 3

[0050] In this embodiment, a multivalent anion selective permeable membrane is prepared in the same manner as in Example 1, the difference is that in step 4, a 50mA / cm 2 current.

[0051] Through characterization and testing, the selectivity coefficient of the anion exchange membrane (MAEM-10) after the modification of the present embodiment is shown in Table 1, and the geometric structure of the surface is as follows image 3 As shown, the infrared spectrum is shown as Figure 4 As shown, the I-V curve is shown as Figure 5 shown.

[0052] Table 1 Selectivity coefficient list of modified anion exchange membrane

[0053]

[0054]

[0055] *T-5 means the current density of the test is 5mA / cm 2 , the same T-10 and T-20 refer to the test current density of 10mA / cm 2 and 20mA / cm 2 .

[0056] It can be seen from the surface scanning electron microscope that the surface of the modified anion exchange membrane is smoother than that of the unmodified anion exchange membra...

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Abstract

The invention discloses a method for preparing a mono-/multi-valent ion exchange membrane by membrane fouling and electrodialysis deposition. The method utilizes a phenomenon that an electrolyte in asolution performs fouling on an ion exchange membrane, and employs an electrodialysis process to foul the surface or interior of a to-be-modified ion exchange membrane by a target pollutant so as to enable the ion exchange membrane to have a mono-/multi-valent ion selective permeability, so that the mono-/multi-valent ion exchange membrane is obtained. According to the method of the invention, through chemical bond combination between the target pollutant and the ion exchange membrane main structure, the surface resistance is effectively reduced, the limiting current density under electrodialysis operating conditions is improved, and peeling of a modification compound from a membrane matrix is avoided during long-term operation. The method has a simple operation process, is easy to industrialize, has a wide range of raw materials, and has low cost in the membrane modification process.

Description

technical field [0001] The invention belongs to the field of ion-exchange membranes, and in particular relates to a membrane fouling-electrodialysis deposition method for preparing a multivalent ion-exchange membrane. Background technique [0002] Ion-exchange membranes are the core components of the electro-driven membrane separation process. Anion-exchange membranes and cation-exchange membranes are two common ion-exchange membranes that have important applications in water treatment, biochemical engineering, industrial chemistry, and environmental protection. Among them, the cation exchange membrane carries negatively charged ion exchange groups, such as quaternary ammonium and quaternary phosphorus groups, which allow the selective passage of cations and block anions; similarly, the anion exchange membrane carries positively charged ion exchange groups , such as sulfonic acid and carboxylic acid groups, allow the selective passage of anions while hindering cations. With...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D71/52B01D69/02B01D67/00
CPCB01D67/0006B01D67/0093B01D69/02B01D71/52B01D71/82B01D2325/42
Inventor 徐铜文蒋晨啸张东钰
Owner UNIV OF SCI & TECH OF CHINA
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