9470

8753

كارشناسي ارشد

مهندسي شيمي- پديده هاي انتقال

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي شيمي

1393

پانزده،106ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

محمد قريشي، جواد كريمي

27/10/93

مرتضي صادقي، صديقه برهاني

مهندسي شيمي

ID8753

Fabrication of Hydrophobic Membranes via Electrospinning Method and Application for Air Gap Membrane Distillation Ali Mohammad Hemmat a hemmat@ce iut ac ir Data of submission 1th November 2014 Department of chemical engineering Isfahan University of technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor prof Seyyed Mohammad Ghoreishi ghoreshi@cc iut ac irAbstractThe main hindrance for industrial success of membrane distillation MD is the availability of optimized designof MD membrane that can produce high surface hydrophobicity high porosity appropriate pore sizes and ahigher flux In the past few years application of electrospun nanofiber has gained intensive attention for MDmembrane and exhibit so far promising results The aim of this study was to fabricate and optimize ofpolyvinylidenefluoride co hexafluoropropylene PVDF HFP electrospun nanofiber membranes Thecorrelation of entanglement concentration Ce of PVDF HFP solution and its electrospinnability wasinvestigated to determine the proper concentration rang for formation of bead free and uniform PVDF HFPfiber Response surface methodology RSM based on Box Benkhen design was employe to developedquantitative models to facilitate a more systematic understanding of the electrospinning parameters whichenable the optimization of PVDF HFP electrospun nanofiber membrane The effective variables studied includesolution concentration the distance between needle tip and collector feed rate and voltage The objective was toprepare optimized electrospun nanofiber membrane with pore size in the range of 300 500nm narrow pore sizedispersion maximum porosity and hydrophpbosity Scanning electron microscopy SEM geniometer gravimetric method and air gap MD AGMD setup were used to characterize the resultant nanofiber PVDF HFP membranes The obtained optimal point was located in the valid region and the experimental confirmationtests were conducted showing a good compatibility between the predicted optimal points and the experimentalones The optimum electrospinning conditions were obtained to be 23wt concentration 13 kV voltages 24 cmtips to collector distance and polymer 0 4 mL h flow rate At the optimal operating condition the fabricatedmembranes were characterized with mean pore size porosity and contact angle of 435 nm 81 and 1410 respectively The synthesized membrane was applied in desalination via air gap membrane distillation in whicha water flux of 13 6 Lh 1m 2 with a salt rejection ratio of 99 7 was obtained Keywords Membrane distillation Electrospun membrane Response surface methodology Box Benkhen design Polyvinylidenefluoride co hexafluoropropylene PVDF HFP Nanofibermembranes Optimization

محمد قريشي، جواد كريمي

مرتضي صادقي، صديقه برهاني