Chitosan-based nanofibrous membranes for antibacterial filter applications

Area of Science:

• Materials Science
• Environmental Engineering
• Biotechnology

Background:

• Nanofibrous membranes are promising for high-flux filtration of micro- and nano-sized particulates.
• Integrating antibacterial properties into water filters is challenging due to potential harmful byproducts from chemical additives.
• Chitosan possesses natural antibacterial properties, offering a potential solution for safer water filtration.

Purpose of the Study:

• To develop and evaluate chitosan-polycaprolactone (PCL) nanofibrous membranes for antibacterial water filtration.
• To assess the antibacterial efficacy and filtration performance of these composite membranes.

Main Methods:

• Chitosan-PCL nanofibrous membranes with varying chitosan content (25%, 50%, 75% wt%) were fabricated using electrospinning.
• Bacterial challenge tests were conducted using Staphylococcus aureus to evaluate antibacterial activity.
• Water permeability and particulate removal efficiency (300-nm particulates) were measured.

Main Results:

• Chitosan-PCL membranes significantly reduced Staphylococcus aureus adhesion compared to pure PCL membranes.
• The membrane with 25% chitosan exhibited high water flux (∼7000 L/h/m²) and 100% removal of 300-nm particulates.
• Membrane integrity was maintained throughout the filtration tests.

Conclusions:

• Chitosan-PCL nanofibrous membranes effectively combine filtration and intrinsic antibacterial capabilities.
• These membranes show significant potential as pre-filters for water filtration systems, offering a safer alternative to chemical treatments.
• The study highlights the advantages of using natural antibacterial agents in advanced filtration technologies.