مشروع البحث: SPIDER-WEB LIKE OMNIPHOBIC MULLITE HOLLOW FIBRE MEMBRANE FOR MEMBRANE DISTILLATION DESALINATION
تحميل...
المساهمين
الممولين
رقم التعريف
359
الباحث
MOHAMED FARAG TWIBI
الوصف
CHFM was successfully fabricated through combined phase inversion and sintering
techniques. The operational parameters such as mullite content (52.5 to 61.5 wt.%),
sintering temperature (1350 to 1550 °C), and air gap (5 to 20 cm) were optimized
during the fabrication of mullite CHFM. The resulting membranes were systematically
characterized and evaluated in terms of morphology, porosity, mechanical strength,
and water flux. In the second stage of the study, the mullite ceramic hollow fibre
membrane (MCHFM) was surface-coated with a spider web-like (SWL) Co3O4 rough
layer via hydrothermal method at different reaction times (10, 13, 16, and 19 h) before
a fluorination step using fluoroalkylsilane (FAS-17) (97%). After surface
modification, the synthesized super hydrophilic membrane became highly repellent to
water and other low surface tension liquids such as olive oil and engine oil with 32 and
31 mN/m of force, respectively. The surface-modified omniphobic membrane showed
super-omniphobic properties towards engine oil at 154°, deionized water at 165°, and
near superomniphobicity at 142.1° towards olive oil. In the final stage of this study the
hydrothermal reaction time of the omniphobic membranes was studied using the direct
contact membrane distillation DCMD test at 60 °C, while utilizing 30 g/L of sodium
chloride NaCl and 8 mg/L of humic acid as feed. In addition, the effect of salt
concentration (10 to 40 g/L) and feed temperature (50 to 80 °C) was studied using
DCMD. The membrane with 16h hydrothermal reaction time (Hy-16h/FAS) was used
for long-term stability. The (Hy-16h/FAS) achieved long-term stability as the rejection
rate and water flux values were relatively constant (99.99 %) and 22.5 kg/m2.h for
about 75 h of the MD process. SEM analysis showed no fouling on the surface
modified membrane. This was attributed to the Co3O4 spider web-like particles, which
achieved superior anti-fouling properties. This implied the suitability of the fabricated
omniphobic MCHFM with an SWL structure for DCMD and seawater desalination, in
spite of organic contaminants.
الكلمات الدالة
seperti sarang labah-labah Co3O4 yang mencapai sifat anti-enapan yang unggul. Hal ini menunjukkan kesesuaian penggunaan MCHFM omnifobik dengan struktur SWL di dalam proses DCMD dan penyahgaraman air laut mahupun bahan cemar organik.