Synergistic Effect of Chitosan and Metal Oxide Additives on Improving the Organic and Biofouling Resistance of Polyethersulfone Ultrafiltration Membranes

Abstract

The combination of chitosan and metal oxides was utilized as an addition to improve the fouling resistance of polyethersulfone (PES) ultrafiltration membranes. Pure water flux, membrane hydrophilicity by the contact angle, scanning electron micrographs, and Fourier-transform infrared spectra were used to characterize the membranes. With the addition of metal oxides, the modified membrane’s water flux increased. The PES membrane with 0.25% wt chitosan and 2.0% wt AgNO3 had the highest flux and antibacterial activity among the membranes tested. Because of its potential to improve membrane hydrophilicity, the water flux increased with the addition of chitosan and AgNO3. Because of the improved hydrophilicity, the contact angle reduced as chitosan and Ag loading was increased. The PES–chitosan–Ag2O (from AgNO3 2.0% wt) membrane had high antibacterial activity against Escherichia coli and Staphylococcus aureus, whereas the PES–2.0% wt Ag membrane did not show the same result. Finally, the addition of chitosan in the PES–Ag membrane increased the membrane’s antibacterial activity substantially.

Fabrication and Investigation of Acid Functionalized CNT Blended Nanocomposite Hollow Fiber Membrane for High Filtration and Antifouling Performance in Ultrafiltration Process

“…For example, carbon-based nanomaterials such as carbon nanotubes [ 17 , 18 ], graphene oxide [ 19 , 20 ], and carbon quantum dots [ 21 , 22 ] have been widely used to improve the permeance and antifouling properties of membranes. Metal [ 23 , 24 ] and metal oxide [ 25 , 26 ] blended PES membranes also exhibited improved filtration performance and antimicrobial properties. In addition, it was recently found that porous nanomaterials such as zeolite [ 27 , 28 ], metal–organic frameworks [ 29 , 30 ], and mesoporous carbon [ 31 ] increase the filtration performance of PES membranes.…”