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Dynamic self-assembled process for preparing low-pressure high-throughput charged nanofiltration membrane

A self-assembly, low-pressure and high-pressure technology, applied in the field of nanofiltration membranes, can solve problems such as unsuitability for industrial production, increased operating pressure, and long assembly time, and achieve the effects of simple method, low operating pressure, and controllable membrane structure

Inactive Publication Date: 2008-10-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in the work reported by Bernd Tieke, in order to prepare a defect-free membrane, the number of assembled layers even reached 60 double layers. The assembly time is long and the efficiency is low. It is not suitable for industrial production, and due to the increase in the number of layers, the operating pressure increases.

Method used

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  • Dynamic self-assembled process for preparing low-pressure high-throughput charged nanofiltration membrane
  • Dynamic self-assembled process for preparing low-pressure high-throughput charged nanofiltration membrane
  • Dynamic self-assembled process for preparing low-pressure high-throughput charged nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The ultrafiltration membrane used in this example is an alkali-modified polyacrylonitrile (PAN) ultrafiltration membrane with a molecular weight cut-off of 50,000.

[0025] Dynamic self-assembly was performed in a stainless steel vessel with a diameter of 9 cm and a porous support layer at the bottom. The membrane surface of the ultrafiltration membrane is facing up, the edge is fixed, placed in the container, and self-assembled according to the following steps:

[0026] 1) Dissolve polyallyl ammonium chloride (Mw=60,000) in deionized water to make a solution with a concentration of 0.2%, then add NaCl to the polyallyl ammonium chloride solution, and the concentration of NaCl solution is 0.5% M, then add concentrated hydrochloric acid dropwise to adjust the pH value of the solution to 2.5; dissolve sodium polystyrene sulfonate (Mw=70,000) with deionized water to make a 0.4% aqueous solution, and then dissolve it in the sodium polystyrene sulfonate solution Add CaCl 2 ...

Embodiment 2

[0033] The ultrafiltration membrane used in this example is a PES-SPES blend ultrafiltration membrane with a molecular weight cut off of 30,000.

[0034] Dynamic self-assembly was performed in a stainless steel vessel with a diameter of 9 cm and a porous support layer at the bottom. The membrane surface of the PES-SPES blend ultrafiltration membrane is facing upwards, the edge is fixed, placed in the container, and self-assembled according to the following steps:

[0035] 1) Dissolve polyallyl ammonium chloride (Mw=60,000) with deionized water to make a solution with a concentration of 0.2%, then add NaCl, the concentration of the NaCl solution is 0.5M, then add concentrated hydrochloric acid dropwise to adjust the concentration of the solution The pH value is 2.3; dissolve sodium polystyrene sulfonate (Mw=70,000) in deionized water to make a 0.4% aqueous solution, and then add CaCl 2 , so that CaCl 2 The concentration of the solution is 0.5M, and the pH value of the solutio...

Embodiment 3

[0042] According to the conditions of Example 1, the alkali-modified polyacrylonitrile (PAN) ultrafiltration membrane was used as the base membrane, and the molecular weight cut-off was 50,000. The concentration of the sodium polystyrene sulfonate-maleic acid (salt) copolymer solution was 3.22%. The membrane is sensitive to NaCl, Na 2 SO 4 , MgCl 2 The separation performance is shown in Table 1.

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Abstract

The invention discloses a method for preparing low-voltage high-flux charged nano-filtration membrane by dynamic self-assembly, which is characterized in that polymer ultra-filtration membrane is taken as a basic film; polycation electrolyte and polyanion electrolyte are alternatively and dynamically self-assembled on the surface of the basic film to gain a selective separation layer and to prepare the nano-filtration membrane of charged surface; wherein, the used ultra-filtration membrane molecular weight cutoff is less than 0.1 million; the ultra-filtration membrane material is surface-charged or modified-charged polymer. Nano-filtration membrane preparation by polyelectrolyte dynamic self-assembly has high efficiency, simple and convenient method and controllable assembly process and film structure; pure water solution is used in the whole preparation process, which is green and environmental protective; the applicable polyelectrolyte has a plurality of types; the separation films with different performances can be obtained by adjusting the types of the polyelectrolyte and the assembly conditions. Furthermore, the prepared nano-filtration membrane has low operation pressure, high removal rate on high valence inorganic salts and far greater flux than the current commercial nano-filtration membrane and the nano-filtration membrane preparation method has good application prospect.

Description

technical field [0001] The invention belongs to the technical field of nanofiltration membranes, and in particular relates to a method for dynamically self-assembling a charged nanofiltration membrane with low pressure and high flux. This method is suitable for self-assembly of polyelectrolytes with different charges. A nanofiltration membrane with controllable performance was obtained by changing the number of assembled layers, the type of polyelectrolyte, the concentration of the solution, and the assembly time. The use of dynamic self-assembly greatly improves the assembly efficiency, and has the characteristics of simple operation and controllable reaction. Moreover, the operating pressure of the prepared nanofiltration membrane is low, the removal rate of high-priced inorganic salts is high, and the flux is far greater than that of the current commercial nanofiltration membrane, which is a preparation method of the nanofiltration membrane with good application prospects....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00
Inventor 徐又一邓慧宇朱宝库魏秀珍
Owner ZHEJIANG UNIV
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