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Preparation, Surface Modification and Application of Nanocomposite Membranes Based on Transition Metals- Dichalcogenide Nanoparticles in Forward Osmosis Desalination Process

Nikkhoo, Mohammad | 2023

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 55945 (48)
  4. University: Sharif University of Technology
  5. Department: Institute for Nanoscience and Nanotechnology
  6. Advisor(s): Bagherzadeh, Mojtaba; Ahadian, Mohammad Mahdi; Amini, Mojtaba
  7. Abstract:
  8. Different parts of this research are focused on developing FO membranes and improving their performance. For this purpose, thin film composite (TFC) membranes with fixed composition of polyethersulfone/polyamide (PES/PA) have been used to investigate the effect of nanocomposites containing transition metal dichalcogenides (TMDs) on their performance. The support layer in all cases is PES, which is prepared through the phase inversion process and does not contain any nanofillers. The modification process takes place in the polyamide layer by dispersing the desired nanoparticles in the aqueous monomer solution necessary to form this active layer. Identification and characterization of synthesized nanoparticles and membranes were done using several analysis methods such as AFM, BET, TEM, EDS, FE-SEM, XRD, FT-IR, water contact angle and zeta potential. TMDs used included MoS2 and WS2. These compounds were considered due to their suitable hydrophilic properties, two-dimensional structure with high surface area, stability in aqueous environment and anti-fouling. Three groups of compounds namely CuAl LDH, UiO-66-(CO2H)2 and zeolite X were used to prepare nanocomposite with the two mentioned compounds. The reasons for choosing these compounds are: high hydrophilicity, high surface area, suitable porosity and stability in water environment. The results obtained from these studies showed that TMDs nanosheets have a very high ability to improve the performance of FO membranes if modified with appropriate compounds. WS2/CuAl LDH, WS2-Cys-MOF and MoS2@Z nanocomposites were able to perform better than the unmodified membrane by modifying the different characteristics of the active layer. They increase the water flux by 2, 2 and 2.6 times, respectively, compared to the virgin membrane
  9. Keywords:
  10. Nanocomposite Membrane ; Desalination ; Forward Osmosis ; Thin Film Nanocomposite Membranes ; Transition Metal Dichalcogenide Nanoparticles ; Polyethersulphone Membrane

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