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Surface Modification of UF Membrane by Cationic Polymers

Abdolmaleki, Hamid Reza | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55244 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Mousavi, Abbas
  7. Abstract:
  8. One of the most efficient and effective methods of water and wastewater treatment is the use of membranes and can be a good alternative to traditional methods such as adsorption, chemical coagulation and .... One of the limitations of this method is membrane fouling, which limits its use in industry.In this study, ultrafiltration membrane made by phase inversion method from a combination of PVDF and SPES polymers and surface modified with hyperbranched polyethylene imine and its performance in cationic coating paint purification was investigated. Also, the performance of this membrane has been investigated by calculating the separation rate, pure water flux, contact angle and specifications obtained from FESEM, AFM, HNMR and FTIR analyzes.Sulfonated polyether sulfone was confirmed by HNMR test. The attraction between surface of the membrane and HBPEI was also assessed by FTIR test. Identification The amount and type of charge of dye particles were determined by zeta potential test. FESEM imaging was also performed on the surface and cross-section of the membrane and the shape and size of the pores as well as the surface layer coated by the surface modification were observed.Optimized and surface modified membrane is capable of removing paint particles and separation at a rate of 99.9%, which is made of a mixture of PVDF, SPES polymers in a ratio of 11: 3 and then surface modification by HBPEI with a concentration of 0.1% by weight. The separation rate of this membrane before surface modification by HBPEI is 95%, which reaches 99.9% with surface modification.The dye flux for the modified membrane increased by 900% compared to the simple PVDF membrane by 14% by weight. Also, after surface modification of PVDF / SPES membrane in a ratio of 11: 3 by HBPEI, we saw a decrease in flux of 11%, but the flux recovery ratio increased from 50 to 90%
  9. Keywords:
  10. Cationic Polymer ; Surface Modification ; Fouling ; Polyvinylidene Fluoride (PVDF) ; Surface Functionality ; Ultrafiltration ; Water Treatment ; Nuclear Magnetic Resonance

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