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Polymeric Membrane Modification for Nitrogen-Compounds Removal from Aqueous Phase

Amiri, Sajjad | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52833 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Musavi, Abbas; Bastani, Dariush
  7. Abstract:
  8. In this research, a novel nanofiltration membrane was used to separate nitrate from water as a nitrogen-containing compound. The membrane was fabricated by interfacial polymerization on the modified polysulfone substrate. To improve the efficiency of nitrate removal, several surface and bulk modifiers were used. As modified with LiCl and PVP polymer, the substrate matrix was modified to have the highest porosity to reduce the mass transfer resistance and the much surface area to form a polyamide layer on it. The polyamide layer was then synthesized by interfacial polymerization using a blend of MPD and PIP in different ratios (1: 1 optimum ratio) in reaction with TMC (optimum concentration 0.25 wt%).The polyamide activated layer was modified by two methods. first, modifying the polyamide layer with PVA and SPVA polymers to balance the nitrate ions by increasing the surface negative charge and the other modifying the membrane surface with UiO-66 nanoparticles as ion adsorption. To increase the negative surface charge of the membrane, SDS surfactant and PVA polymer and modified SPVA polymer were used. The UiO-66 nanoparticle was also synthesized and its isotherm, kinetics, and thermodynamics were investigated for the first time. The reason for using these good hydrophilic nanoparticles was their high specific surface area and high adsorption capacity.Synthesized and modified membranes with UiO-66 and SPVA nanoparticles were characterized by SEM, ATR-FTIR, Zeta potential and size Particle (DLS), contact angle measurements, BET testing, X-ray diffraction (XRD), and flux and retardation tests were performed to confirm structural changes and improvements. The modifications made due to the presence of hydrophilic groups (- OH, -SO3) increase the wettability and surface hydrophilicity of the modified membranes relative to the raw membrane and also by changing the structure and surface charge, nitrate separation was Improved from 83% to 90%
  9. Keywords:
  10. Nanofiltration Membrane ; Poly Vinyl Alcohol ; Separation Nitrate ; Nitrogen Containing Compound ; UiO-66 Hybrid Nanoparticles

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