Antibacterial composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and antibacterial metal ion technology, applied in chemical instruments and methods, membrane, membrane technology, etc., can solve the problem of poor antibacterial persistence of composite nanofiltration membrane, poor permeability of antibacterial composite nanofiltration membrane, and loss of antibacterial particles and other problems, to achieve the effect of stable complexation, improved antibacterial performance, and improved antibacterial performance

Active Publication Date: 2018-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although these methods can improve the antibacterial properties of the membrane surface, there are also various deficiencies, such as the antibacterial particles are easily lost during the use of the membrane, the antibacterial persistence of the composite nanofiltration membrane is poor, and the antibacterial composite nanofiltration membrane has poor antibacterial properties. Select the disadvantages such as poor permeability

Method used

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  • Antibacterial composite nanofiltration membrane and preparation method thereof
  • Antibacterial composite nanofiltration membrane and preparation method thereof
  • Antibacterial composite nanofiltration membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Prepare the water phase solution that the water phase monomer concentration is 5g / L, wherein, the water phase monomer is PEI and piperazine, the percentage of PEI accounting for the total mass of the water phase monomer is 70%, and the number average molecular weight of PEI is 2000; A polyethersulfone porous support membrane with a molecular weight cut-off of 30,000-50,000 is soaked in the aqueous phase solution for 10 seconds, and the excess aqueous phase solution is poured off to prepare a porous support membrane coated with the aqueous phase monomer, and then cleaned with Roll the surface of the membrane dry with a rubber roller; place the porous support membrane coated with the aqueous phase monomer in ISOPAR E solvent oil solution of trimesoyl chloride with a concentration of 1g / L for immersion treatment for 10s, and pour off the excess oil phase solution, then dried in the air, and then placed in a 70°C oven for drying treatment for 1.5min, and a composite nanofilt...

Embodiment 2

[0057] In this embodiment, except that the mass percentage of PEI in the aqueous phase monomer is 80%, and the number average molecular weight of PEI is 5000, the steps for preparing the antibacterial composite nanofiltration membrane are the same as in Example 1. The prepared nanofiltration composite membrane was tested and characterized according to the test methods of separation performance, antibacterial performance and antibacterial metal ion content of the aforementioned composite nanofiltration membrane, and the obtained test results are listed in Table 1.

Embodiment 3

[0059] In this embodiment, except that the mass percentage of PEI in the aqueous phase monomer is 90%, and the number average molecular weight of PEI is 10,000, the steps for preparing the antibacterial composite nanofiltration membrane are the same as in Example 1. The prepared nanofiltration composite membrane was tested and characterized according to the test methods of separation performance, antibacterial performance and antibacterial metal ion content of the aforementioned composite nanofiltration membrane, and the obtained test results are listed in Table 1.

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Abstract

The invention provides an antibacterial composite nanofiltration membrane. The antibacterial composite nanofiltration membrane comprises a porous support membrane bottom layer and an antibacterial surface layer complexed with antibacterial metal ions on the surface. The preparation method of the antibacterial composite nanofiltration membrane comprises the steps as follows: the bottom layer is impregnated with an aqueous phase solution containing aqueous phase monomers, and a bottom layer coated with the aqueous phase monomers is obtained; the bottom layer coated with the aqueous phase monomers is impregnated with an oil phase solution containing oil phase monomers, and a bottom layer coated with the aqueous phase monomers and the oil phase monomers is obtained; the bottom layer coated with the aqueous phase monomers and the oil phase monomers is subjected to thermal treatment, and a composite nanofiltration membrane with a polyamide functional layer is prepared; the composite nanofiltration membrane is impregnated with a metal salt solution containing antibacterial metal ions and the antibacterial composite nanofiltration membrane is obtained, wherein the aqueous phase monomers comprise polyethyleneimine. The antibacterial performance, particularly the microbial pollution resistance, of the antibacterial composite nanofiltration membrane is improved while the high permeabilityis kept; the antibacterial composite nanofiltration membrane has lasting antibacterial performance, long service life and good application prospects.

Description

technical field [0001] The invention belongs to the field of membrane technology, and relates to a composite nanofiltration membrane, in particular to an antibacterial composite nanofiltration membrane and a preparation method thereof. Background technique [0002] Nanofiltration membrane, also known as "loose type" reverse osmosis membrane, is a new type of separation membrane with a pore size between reverse osmosis membrane and ultrafiltration membrane. It allows low-molecular-weight salts to pass through and intercepts higher-molecular-weight organics and multivalent ions. It has unique separation performance and higher separation accuracy. At present, nanofiltration membranes are widely used in water softening, drinking water purification, removal of organic matter in water, dye purification and concentration, separation and concentration of natural medicines, etc. It is a promising separation membrane variety. [0003] For a long time, the problem of membrane fouling ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/00B01D69/12B01D71/60B01D67/00
CPCB01D61/027B01D67/0006B01D69/125B01D71/60B01D2325/48
Inventor 刘轶群张傲率潘国元张杨严昊徐健郭敏
Owner CHINA PETROLEUM & CHEM CORP
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