Quaternized chitosan HTCC-silver/polyethersulfone antibacterial membrane and preparation thereof

Abstract

The invention discloses a preparation method of a quaternary ammonium chitosan HTCC-silver / PES antibacterial film. First, the positively charged HTCC is used as the surface active functional layer, the PES ultrafiltration membrane with good hydrophilic performance is used as the support layer, and epichlorohydrin is used as the crosslinking agent, and the positively charged quaternary ammonium is prepared by coating crosslinking reaction method. Chitosan HTCC / PES composite nanofiltration membrane. Then soak the nanofiltration membrane in a certain concentration of silver nitrate solution, and dry the membrane with a nitrogen blower. Finally, photochemical reduction technology is used to reduce the silver ions on the membrane surface into silver particles. The preparation method has a simple process, can be carried out at normal temperature, has good reproducibility, does not need to add a reducing agent, is easy to control the particle size, and is natural and environmentally friendly. The antibacterial film prepared according to this method has excellent hydrophilic properties, mechanical properties and swelling properties, and is resistant to Gram-negative bacteria E. coli Rosetta and E. coli DH5α and Gram-positive bacteria Bacillus subtilis Both have good antibacterial ability, and this kind of membrane has a high rejection rate for most PPCPs, and can be used for the separation and removal of trace-trace pollutants in the water environment, especially positively charged substances.

Description

Technical field

[0001] The invention relates to a quaternized chitosan HTCC-Ag / PES antibacterial film and a preparation method thereof, in particular to a composite film with good mechanical properties, swelling performance, and certain antibacterial and separation capabilities, and a preparation method thereof. Membrane separation field. Background technique

[0002] Chitosan is a product obtained by deacetylation of chitin. It is an amorphous translucent substance, non-toxic, harmless, easily biodegradable, does not pollute the environment, and has good adsorption, film-forming properties, Environmentally friendly functional polymer material with hygroscopicity and other characteristics. Although chitosan contains free amino groups, it can only be soluble in dilute acids such as hydrochloric acid, acetic acid, lactic acid, benzoic acid, and formic acid, but not in water, alkaline solutions and most organic solvents. This greatly limits the application of chitosan. And based ...

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