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۱Dual–layer hydrophilic\hydrophobic PVDF–HFP electrospun membranes synthesis for Air Gap Membrane Distillation (AGMD)
اطلاعات انتشار: دومین همایش ملی غشا و فرایندهای غشایی، سال
تعداد صفحات: ۷
The main challenges for membranes used in membrane distillation (MD) are well–designed porous structure and hydrophobic surface property. Hydrophobic nanofiber membranes possess high hydrophobicity, high surface porosity and adjustable pore sizes and membrane thickness, which make them an attractive candidate as MD membranes. Compared to traditional phase inversion techniques for membrane fabrication, electrospinning allows the formation of interconnected pores with uniform pore size and porosities exceeding 90%.In this study, a electrospun nanofiber polyvinylidenefluoride–co–hexafluoropropylene (PVDF–HFP) flat–sheet composite membrane using commercial hydrophilic polyester nonwoven as a support layer was prepared for MD applications. This composite nanofiber membrane has been characterized by a series of measurements (scanning electron microscopy (SEM),contact angle and porosity measurements and air gap MD (AGMD) setup were used) and benchmarcked against commercial PVDF flat–sheet membrane for MD applications. The electrospun layer of the membrane which fabricated by using optimized process parameters was obtained with mean pore size, porosity, contact angle, and thickness of 435 nm, 81%, 140° and 105 μm, respectively. Fabricated membrane was tested for desalination by air–gap MD and water flux value of 13.2 L\m2.h was obtained with a salt rejection of 98.4%. The present composite nanofiber membrane showed better flux performance and salt rejection compared to a commercial flat–sheet membrane (Flux = 8 L\m2h and SR = 95% ) The result suggest the potential of the nanofibrous membrane for AGMD applications.<\div>

۲hydrophobic pvdf hollow fiber membrane synthesis for direct contact membrane distillation DCMD
نویسنده(ها): ، ، ،
اطلاعات انتشار: دومین همایش ملی غشا و فرایندهای غشایی، سال
تعداد صفحات: ۵
Polyvinylidene fluoride (PVDF) hollow fibers membrane were prepared by the dry\wet jet spinning phase inversion technique. For synthesis of this membrane, the methanol was used as a non–solvent for producing more porous fibers. The Membrane was fabricated at optimum condition; polymer concentration (16% wt), methanol concentration (4% wt) air gap (10 cm), bore fluid rate (10 ml\min). The prepared membrane was characterized through SEM observation and contact angel test. The fiber prepared at this condition has 0.31 μm of mean pore size, 81% of overall porosity and 115º of surface contact angel. Membrane Distillation (MD) process is mainly investigates for desalination, waste water treatment and other applications which water is the major component present in the feed solution to be separates. In this work, hollow fibers were tested for desalination by direct contact membrane distillation and the permeation flux was improved from 12.8 kg\m2.hr (without methanol) to 16.3 kg\m2.hr (with methanol) and 99.3% salt rejection of feed solution (1 molNaCl\lit and temperature of 80 ºC) was obtained<\div>
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