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Preparation and Characterization of Electrospun Nanofiberous Membranes for Wastewater Treatment

Seyed Shahabadi, Mahdi | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46689 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Bastani, Daruoosh; Moosavi, Ali
  7. Abstract:
  8. The aim of the current project is preparation, characterization and microfiltration evaluation of nanofiberous membrane. In order to prepare membranes, the electrospinning method was utilized and polyacrylonitrile and N-N, dimethylformamide (DMF) were used as the polymer and the solvent, respectively. As the nanofiber diameter controls the structure of the membrane and also bead formation reduces the membrane uniformity, at first the effects of four most influential electrospinning parameters, such as solution concentration, applied voltage, floe rate, and the distance between needle tip and the collector, on average fiber diameter and bead area density were investigated via response surface methodology. The results shoe that the effects of concentration, voltage, and distance are significant on diameter. Also, the interaction between voltage and distance was important in diameter model. Similarly, the effects of concentration, voltage, and distance were important in bead area density model, but the concentration-voltage and concentration-distance interaction effects were important too. After achieving the quadratic polynomials for fiber diameter and bead area density, electrospun nanofiberous membranes were prepared with average fiber diameter of 100, 200, 300, 400, and 500 nanometers so as to validate the models and also prepare suitable membranes for further experiments. The membrane characterization revealed that as the fiber diameter increases, porosity decreases, mean pore diameter increases, and mechanical properties decreases. Moreover, pure water flux tests show that an increase in fiber diameter results in higher fluxes. Finally, microparticle rejection test shows that membranes with lower fiber diameters have higher rejection ratios
  9. Keywords:
  10. Electrospinning ; Membranes ; Nanofiber ; Microfiltration Membrane ; Polyacrylonitrile

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