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Method for preparing anti-pollution polysulfone porous membrane by self-assembling immobilization of metal ions

A technology for immobilizing metal ions and metal ions, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. The effect of strong anti-pollution ability

Inactive Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polysulfone is a hydrophobic high polymer, which is easy to cause membrane fouling, shorten the service life of the membrane, and increase the production cost
[0006] Patent CN1683061 discloses a nano-antibacterial material-polysulfone composite microporous filter membrane and its preparation method. In this method, one or more of nano-titanium dioxide, nano-silver, nano-zinc and nano-copper are mixed and added to enhance the membrane Anti-fouling ability, and improve the hydrophilicity and permeability of the membrane, but it is difficult for nanomaterials to disperse evenly in the casting solution, which affects the quality and performance of the prepared membrane
[0007] Patent CN201110442062.4 describes an antibacterial polysulfone flat ultrafiltration membrane and its preparation method. Aiming at the disadvantages that nanomaterials are difficult to disperse evenly and require pretreatment, polysulfone is used as the membrane material and the liquid phase reduction silver nitrate method is used. The obtained nano-silver particles are antibacterial additives, and the nano-silver-polysulfone composite flat ultrafiltration membrane prepared by immersion precipitation phase inversion method needs to add other reducing agents to reduce silver nitrate to obtain nano-silver, and the system needs to be readjusted. Membrane parameters, increasing the complexity of the process

Method used

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  • Method for preparing anti-pollution polysulfone porous membrane by self-assembling immobilization of metal ions
  • Method for preparing anti-pollution polysulfone porous membrane by self-assembling immobilization of metal ions

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Select a flat ultrafiltration membrane made of polysulfone as the base membrane (see Table 1 for the main membrane parameters), soak it in a 5% polyethyleneimine deionized aqueous solution, stir it at a slow speed for 12 hours, take it out, and use Wash away the excess polyethyleneimine on the surface of the polysulfone ultrafiltration membrane with deionized water oscillation, dry it and immerse it in a copper acetate solution with a mass percentage of 5%, stir at a slow speed for 6 hours to carry out the coordination complexation reaction, take it out and use it The superfluous metal ions on the surface of the modified polysulfone ultrafiltration membrane were shaken and washed with ion water to obtain a polysulfone ultrafiltration membrane modified by hydrophilic antibacterial, and then soaked in 20% glycerin aqueous solution to preserve the pores for later use. The performance parameters of the prepared modified membrane and the base membrane are shown in Table 1.

Embodiment 2

[0044] Take the flat ultrafiltration membrane made of polyethersulfone as the base membrane (see Table 1 for the main membrane parameters), soak it in a mixture of 7% chitosan and 3% water-soluble chitosan for deionization In the aqueous solution, take it out after stirring at a slow speed for 24 hours, shake off the excess chitosan and chitosan molecules on the surface of the polysulfone ultrafiltration membrane with deionized water, and immerse it in a silver nitrate solution with a mass percentage of 10% after drying. Stir at a slow speed for 4 hours to carry out the coordination and complexation reaction. After taking it out, shake and wash the excess metal ions on the surface of the modified polyethersulfone ultrafiltration membrane with deionized water to obtain a hydrophilic antibacterial modified polyethersulfone ultrafiltration membrane. , and then soaked with 20% glycerin aqueous solution to preserve the pores for later use. The performance parameters of the prepared...

Embodiment 3

[0046] Select a flat ultrafiltration membrane made of sulfonated polysulfone / polyethersulfone as the base membrane (see Table 1 for the main membrane parameters), soak it in a deionized aqueous solution of polylysine with a mass percentage of 1% and stir slowly for 16 Take it out after 1 hour, shake off the excess polylysine molecules on the surface of the sulfonated polysulfone / polyethersulfone ultrafiltration membrane with deionized water, immerse in a zinc acetate solution with a mass percentage of 3% after drying, and stir at a slow speed for 12 After taking it out, shake and wash the excess metal ions on the surface of the sulfonated polysulfone / polyethersulfone ultrafiltration membrane with deionized water to obtain the hydrophilic and antibacterial modified sulfonated polysulfone / polyethersulfone ultrafiltration membrane. filter membrane, and then soaked with 20% glycerol aqueous solution to preserve the pores. The performance parameters of the prepared modified membran...

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Abstract

The invention relates to a method for preparing an anti-pollution polysulfone porous membrane by self-assembling immobilization of metal ions. According to surface electrical load properties of a membrane prepared from a polysulfone material, an amino-containing compound with high positive charge density and hydrophily is used as a modification material, the modification material is adsorbed by the surface of the polysulfone porous membrane under electrostatic interaction, through a large amount of amino groups of the modification material, the modification material and Cu<2+>, Zn<2+> or Ag<+> of an inorganic antibacterial agent undergo a coordinated complexation reaction, and the inorganic antibacterial agent is immobilized on the modification material molecule by complexation action so that the polysulfone porous membrane with good hydrophily and antibacterial activity is obtained. The prepared polysulfone porous membrane has hydrophily, antibacterial property and pollution resistance. The method has simple processes, does not need complex equipment and is suitable for industrial scale application. The porous membrane can be widely used in water treatment in the field of environment, chemical engineering, foods and medicine.

Description

technical field [0001] The invention relates to a preparation process of an antibacterial polysulfone porous membrane, in particular to a method for preparing an anti-pollution polysulfone porous membrane by self-assembling and immobilizing metal ions. Background technique [0002] With the aggravation of environmental pollution and the depletion of resources, people's calls and requirements for water recycling and advanced treatment are getting higher and higher. Membrane separation technology is known as the technology of the 21st century, and has been widely used in water treatment fields such as sewage treatment and reuse, ultrapure water production, boiler water softening, urban sewage treatment, seawater desalination, brackish water desalination, municipal water supply, etc. As a high-efficiency separation technology, although membrane separation technology has attracted widespread attention, there are membrane fouling problems when it is applied to industrial producti...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D69/02B01D67/00
Inventor 杨丽许树华张建华魏昕奚振宇
Owner CHINA PETROLEUM & CHEM CORP
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