سارا پيراينده

In this study, for the first time, the successful use of 1-butyl-3-methylimidazolium hexafluorophosphate for the functionalization of carbon nanotubes has been reported, and eva‎luations of carbon nanotubes including FTIR, XRD and FESEM tests were performed. In the next step, these functionalized carbon nanotubes were applied as a suitable nanofiller in the synthesis of mixed matrix membranes (MMM) by phase inversion method consisting of polyvinylidene fluoride (PVDF). eva‎luation of the effect of polymer concentration and modified carbon nanotube content and the effect of cavitation on the performance of the membrane produced in the vacuum membrane distillation (VMD) process was carried out. Also, the surface response method was implemented to optimize the function and structure of the membrane, and the variable parameters of functionalized nanoparticles percentage, polymer percentage, and hole-forming percentage were selected in Design Expert software, and finally, the optimal percentage was selected for the final membrane construction. As can be seen in the results, the functionalized carbon nanotubes have improved various properties of the membrane such as membrane porosity, thermal and mechanical properties, and especially the dispersibility property of nanoparticles inside the membrane matrix, and finger-like cavities without any inappropriate change in hydrophobicity, finally they improve the performance of PVDF membrane. The resulting MMMs were eva‎luated for their appropriate performance in VMD. A water flux of about 63.81 (LMH) and a salt rejection of 99.99% were reported for the membrane containing 0.99 wt% of modified carbon nanotubes and 17 wt% of polymer. Scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM) and water contact angle (WCA) analysis were performed. Also, the mixed matrix membrane by modifying carbon nanotubes with ionic liquid with WCA around 135.46° showed the best performance, increasing the salt rejection by 30% compared to unmodified nanoparticles. Also, in the second stage of this study, a layer of hydrophilic polyvinyl alcohol polymer was applied on the optimal membrane (PVDF/CNT-BMIMPF6) and Janos composite membrane was made and its performance was investigated in the process of membrane distillation under vacuum, and the water flux was 32.5 (LMH.) and salt rejection reached 97%.

غشاي ماتريس آميخته , نانولوله‌هاي كربني , مايع يوني , تقطير غشايي تخت خلأ , پلي وينيليدن فلورايد

Mixed matrix membrane , carbon nanotubes , Ionic liquid , vacuum membrane distillation , PVDF

sara pirayandeh

professor toraj mohammadi