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Preparation of Polyethersulfone/Polyamide (PES/PA)Thin Film Composite Membranes based Modified Nanoclays for Forward Osmosis-Disalination

Veisi, Vahab | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53366 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Bagherzadeh, Mojtaba
  7. Abstract:
  8. In this study, two layer nanocomposite membrane of polyethersulfone (support layer) and polyamide (active layer) were prepared for the purpose of desalination of water by forward osmosis method. In order to take more advantage of this membrane, montmorillonite nanoparticles which had been modified by graphene oxide were placed in it. To bind the nanoparticle components together, at first, montmorillonite was functionalized by (3-Aminopropyl) triethoxysilane to increase its nucleophilicity, and for graphene oxide to increase its electrophilicity, thionyl chloride was added. The two compounds were mixed and stirred for 24 hours in the presence of triethylamine base by magnetic stirrer at 30°C governing the environment and the final nanoparticles were formed. Polyethersulfone for 12 hours in dimethylformamide and ethylene glycol solutions mixed on the stirrer. The resulting solution in the fifth part، and then the resulting nanoparticle in various quantities were added to the solutions. After fabrication of the support layer of polyethersulfone to form a polyamide layer (active layer) on it، in order to create a polyamide layer (active layer) on the polyethersulfonate layer (suport layer), the polar monomer forming the polyamide in the aqueous phase، and the nonpolar monomer in the organic phase were prepared. After preparation، the aqueous monomer for 1.5 minutes and the organic monomer for 2 minutes were in contact with polyethersulfone. For Identification of nanoparticles and active layer IR spectrum analysis, SEM, AFM images, map and EDX elemental analysis were recorded. In order to compare and evaluate, each membrane was positioned separately between two concentrated and dilute saline solutions, which are called draw and feed solutions, respectively, and the amount of water flux and Reverse penetration of salt were tested in them. The results showed that the active layer increases the mechanical and chemical stability and lifetime of the membrane and also stabilizes the behavior of the membrane during the test. on the other hand، the higher the amount of nanoparticles in the membrane showed the higher the flux of water in the membrane and the lower the permeability of the salt
  9. Keywords:
  10. Nanocomposite Membrane ; Graphene Oxide ; Forward Osmosis ; Desalination ; Montmorillonite ; Polyethersulphone Membrane ; Polyamide Membrane

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