Antibacterial composite nanofiltration membrane and preparation method thereof

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 ...

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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

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