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Bakhtiari, Fatemeh | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44535 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Mosavi, Abbas; Shojaei, Akbar
  7. Abstract:
  8. In this work nanocomposite CNT/polysulfone and CNT/polyethersulfone membranes for membrane contactor application in gas separation were fabricated. The two types of CNTs used for chemical and physical separation of H2S from a mixture of CH4 an H2S, had the outer diameter of 20-30nm and 50-100nm. One of the greatest concerns about using membrane contactors for gas separation applications is the wetting of membranes which consequently leads to decrease in separation performance. The aim of this study is to enhance the hydrophobicity of membranes by mixing hydrophobic carbon nanotubes in the polymeric matrix. The effect of factors like type of the polymer, diameter of the carbon nanotube and concentration of the nanoparticles on hydrophobicity, morphology, mechanical properties and the separation performance of the membranes were investigated. The results showed that by increasing the concentration of carbon nanotubes in polymeric matrix the contact angle of water with surface of the membranes increased and this effect was more visible for the PES membranes. Addition of hydrophobic nano-particles couldnarrow the pore size distribution and increase the membrane contact angle to some extent.In addition, the compositemembranes presented stronger mechanical properties compared to the membrane without particles. The investigatios showed that, all in all, adding nanoparticles improves the separation performance. Permibeality tests proves that the permeability of the membranes fabricated with polymer and 50-100nm nanotubes increased with increasing the concentration of CNT but the pattern for 20-30nm CNTs was first decreasing and then increasing
  9. Keywords:
  10. Hydrophobicity ; Nanocomposite Membrane ; Membrane Contactor ; Membrane Separation ; Carbon Nanotubes ; Membrane Humidifier

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