Fabrication of Antibacterial Nanocomposite Membrane Based on PVC Polymer

The significance of membrane processes for the treatment of wastewater and drinking water is still growing. The expense of membranes continues to decrease and it is possible to predict that membranes will be in extensive use in water treatment processes. Recently, the number of industrial applications has gained increasing interest. The use of antibacterial membranes in separation processes stands out owing to their considerable environmental and economic۲advantages. However, the evaluation of new materials for membrane fabrication opens up the opportunity for further related processes development. The composite membranes represent the essential properties of organic polymeric matrix and inorganic fillers and put forward specific advantages for the fabrication of new membranes with suitable separation performance. In this study, antibacterial nanocomposite membranes based on polyvinyl chloride polymer and silver nanoparticles were prepared using phase inversion method (immersion). For antibacterial membranes preparation, Pseudomonas bacteria were synthesized and used for antibacterial activity by weight percentage ۰.۲۵, ۰.۵ and ۱ in the mixtures. These mixtures were then immersed in a non-solvent bath (distilled water) after being pulled by a film applicator. DLS nanoparticle analyzer was used to detect nanoparticles and particles size. Also to identify silver nanoparticles in membranes structure, X-ray diffraction (XRD) spectroscopy was used. To evaluate the antibacterial properties of the membranes Disk test was used using Escherichia coli (E. coli) as a gram-negative bacterium and Staphylococcus aureus (S. aureus) as a gram-positive bacterium. To test the performance of the fabricated membranes, the flow rate was measured and the rejection test was performed. After determining the presence of nanoparticles in the membrane structure, the DLS nanoparticle analyzer determined the size of the synthesized nanoparticles under optimal conditions between ۰.۴۶ and ۰.۵۴ nm. The permeability and antibacterial properties of membranes against gram-positive and gram-negative bacteria increased with increasing silver nanoparticles

کلیدواژه ها:

Membrane ، Nanocomposite ، Polyvinyl Chloride ، Silver Nanoparticles ، Antibacterial