تهيه ‌و شناسايي غشاهاي ميكروفيلتراسيون فوق‌آ‌‌بگريز بر مبناي نانوالياف پلي‌اتيلن‌ترفتالات بازيافتي جهت جداسازي روغن و آب

Polyrthylene terephthalate (PET) , Superhydro‎phobic membrane , Superhydro‎phobic membrane

Preparation an‎d characterization of superhydro‎phobic microfiltration membranes based on recycled polyethylene terephthalate nanofibers for separation of oil an‎d Water

نانو فناوري

In this study, electrospun recycled polyethylene terephthalate (PET) nanofibers were surface modified with the aim of producing efficient microfiltration membranes for water an‎d oil separation. For this purpose, two chemical modification approaches were used, including a sol-gel method based on tetraethylorthosilicate (TEOS) to create superhydro‎philic properties an‎d the use of methyltrichlorosilane to create superhydro‎phobic properties. FTIR analysis confirmed the distinct changes in surface functional groups, the formation of silica layers an‎d the presence of Si–CH₃ groups in the superhydro‎phobic samples an‎d the increase in Si–O–Si an‎d Si–OH peaks in the superhydro‎philic samples. FESEM images an‎d EDAX-Mapping analysis showed that in the superhydro‎philic sample, silica nanoparticles uniformly covered the fiber surface, an‎d in the superhydro‎phobic sample, agglomerated layers increased the two-scale surface roughness. The contact angle test indicated that the raw PET sample was relatively hydro‎phobic with an angle of about 87 degrees, while after surface modification, the superhydro‎philic membrane showed a contact angle of zero an‎d the superhydro‎phobic membrane showed a contact angle of about 162 degrees. Also, the oil contact angle from underwater for the superhydro‎philic membrane showed that it is a strong oil repellent in aqueous environment. The performance tests indicated that the superhydro‎philic membrane had the highest water flux at 31.978 ± 19.36 l/m2/h due to the presence of Si-OH groups an‎d a high tendency to absorb water on the surface, while the superhydro‎phobic membrane had a lower water flux at 33.155 ± 7.14 l/m2/h an‎d showed a higher tendency to absorb oil in dry environment. The mechanical results also showed that the surface modification improved the mechanical strength; in particular, the superhydro‎phobic membrane had higher mechanical strength due to the formation of harder layers. Finally, this study demonstrated that by targeted surface modification of PET nanofibers, the wettability, filtration performance, an‎d water/oil separation properties can be significantly improved, an‎d recycled membranes with high added value for environmental an‎d industrial applications can be produced. The water an‎d oil retention an‎d separation rates of both superhydro‎philic an‎d superhydro‎phobic membranes were also shown to be 97% ± 1%.

فولاد مباركه

5

146916