Antibacterial Cellulose Composite Membranes Prepared In Ionic Liquid Via Phase Inversion Method

In this paper,a green and reusable solvent 1-Butyl-3-methylimidazolium chloride?[BMIM]Cl?was used to prepare cellulose membrane and cellulose composite membranes.It is the first report on comparing the antibacterial results of cellulose/TiO₂,cellulose/ZnO and cellulose/chitosan composite membranes,which provides the experimental basis for the practical application of antibacterial cellulose composite membrane in the future.In this paper cellulose membrane,cellulose/TiO₂,cellulose/ZnO and cellulose/chitosan composite membranes were successfully prepared with?[BMIM]Cl?via phase inversion while[BMIM]Cl was recycled and used to prepare recycled cellulose membrane.The FTIR analysis of ionic liquid before and after regeneration proved that proposed regeneration method is efficient and the recovery of[BMIM]Cl was 98.43%.Fourier transform infrared,X-ray diffraction,thermogravimetry,scanning electron microscope,mechanical properties,water contact angle,pure water flux,molecular weight cutoff and antibacterial properties were employed to investigate the morphological characteristics of all membrane samples.The results showed that cellulose crystallization was changed from cellulose I to cellulose II after dissolving in[BMIM]Cl.Cellulose composite membranes had good thermal stability and mechanical properties.The hydrophilicity and pure water flux were significantly increased by adding TiO₂,ZnO and chitosan into cellulose and a perfect retention value of 67 kDa was achieved in composite membranes.The bacterial reduction of cellulose/TiO₂ membrane,cellulose/ZnO membrane and cellulose/chitosan membrane with blend ratio 10:3 was the maximum and reached 100%,100%and 97.2%for S.aureus and 100%,99.8%and 97.0%for E.coli,respectively.