{"id":{"repo_id":"buffalo","oai_identifier":"oai:ubir.buffalo.edu:10477/83841"},"canonical_url":"https://search.dev.ndltd.org/etd/buffalo/oai:ubir.buffalo.edu:10477/83841","repository":{"repo_id":"buffalo","name":"Buffalo","base_url":"https://ubir.buffalo.edu/oai/request"},"display":{"title":"Antifouling Membranes by Surface Modification using Hydrophilic Polymers","abstract":"Ph.D.","abstract_html":"Ph.D.","abstract_has_math":false,"creators":["Shahkaramipour, Nima"],"institution":"State University of New York at Buffalo","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Lin, Haiqing","Chemical and Biological Engineering"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2022,"date_issued":"2022-06-17T19:54:39Z","date_published":"2022-06-17T19:54:39Z","updated_at":"2026-07-27T19:05:28Z","subjects":["chemical engineering"],"languages":["eng"],"rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10477/83841","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Lin, Haiqing","Chemical and Biological Engineering"]},{"key":"dc:creator","label":"Author","values":["Shahkaramipour, Nima"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2022-06-17T19:54:39Z","2020"]},{"key":"dc:publisher","label":"Institution","values":["State University of New York at Buffalo"]},{"key":"dc:type","label":"Dc Type","values":["Text","Dissertation"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["chemical engineering"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/10477/83841"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Ph.D.","Today water purification and wastewater treatment are important in many of industries. Polymeric membranes are being used in this area because of their promising features such as low cost and high energy efficiency. The contaminants in the water may adhere to the surface of membranes, resulting in the water flux reduction, a phenomenon named fouling. Membrane surface modification is a promising approach to mitigate fouling. Herein we study surface modification of ultrafiltration (UF) and nanofiltration (NF) membranes using different zwitterionic materials, as superhydrophilic agents, to increase the antifouling properties of membranes. In the first chapter, an introduction to the membrane technology and membrane fouling, as well as different categories of membrane surface modification are presented. In the second chapter, we present the synthesis and characterization of novel betaine-based zwitterionic materials containing thiol functional group. We grafted these zwitterions with bio-inspired dopamine as a two-step approach onto the polyethersulfone (PES) UF membranes, and evaluated the modified membranes antifouling properties with a model biofoulant. Due to the high solubility of super hydrophilic zwitterions, forming a robust zwitterionic layer on the membrane surface for under water operation is still challenging. Employing this approach, there would be covalent interactions between the zwitterionic polymers and polydopamine layer, making stable layers of zwitterions on the surface. In the third chapter, we present a facile technique to fabricate antifouling membranes via dopamine and hydrophilic zwitterionic monomers containing methacrylate functional group. The existing approaches in the literature to enhance the membrane surface hydrophilicity, aiming to decrease the rate of fouling, suffer from complexity. The technique we propose in the third chapter is doable under room temperature and in one-step, which can easily be scaled up for water purification/wastewater reuse. In the fourth chapter, we study a new class of zwitterionic monomers containing amine functional group and their co-deposition with dopamine to improve the grafting density of zwitterions on the membrane surface. During the project described in the third chapter, we successfully demonstrated improved antifouling properties of both flat sheet membranes and membrane modules using methacrylate functionalized zwitterions. However, the loading of zwitterions on the surface was only ~11 wt%. In the last project, we demonstrated that zwitterions with amine groups can deposit more easily on the surface, through co-deposition with dopamine (upto ~31 wt%), compared with those containing methacrylate functional group. Polysulfone (PSf) UF membranes grafted with amine-containing zwitterions exhibited lower transport resistance, compared with pristine and methacrylate-functionalized counterparts, during a filtration experiment via a constant flux crossflow filtration apparatus and sodium alginate as the foulant.","**To request an accessible version of the file(s) associated with this item, contact library@buffalo.edu. Please include the item's persistent URL [http://hdl.handle.net/. . .] in your request.**"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Antifouling Membranes by Surface Modification using Hydrophilic Polymers"]}]}],"canonical_facts":{"dc:contributor":["Lin, Haiqing","Chemical and Biological Engineering"],"dc:creator":["Shahkaramipour, Nima"],"dc:date":["2022-06-17T19:54:39Z","2020"],"dc:description":["Ph.D.","Today water purification and wastewater treatment are important in many of industries. Polymeric membranes are being used in this area because of their promising features such as low cost and high energy efficiency. The contaminants in the water may adhere to the surface of membranes, resulting in the water flux reduction, a phenomenon named fouling. Membrane surface modification is a promising approach to mitigate fouling. Herein we study surface modification of ultrafiltration (UF) and nanofiltration (NF) membranes using different zwitterionic materials, as superhydrophilic agents, to increase the antifouling properties of membranes. In the first chapter, an introduction to the membrane technology and membrane fouling, as well as different categories of membrane surface modification are presented. In the second chapter, we present the synthesis and characterization of novel betaine-based zwitterionic materials containing thiol functional group. We grafted these zwitterions with bio-inspired dopamine as a two-step approach onto the polyethersulfone (PES) UF membranes, and evaluated the modified membranes antifouling properties with a model biofoulant. Due to the high solubility of super hydrophilic zwitterions, forming a robust zwitterionic layer on the membrane surface for under water operation is still challenging. Employing this approach, there would be covalent interactions between the zwitterionic polymers and polydopamine layer, making stable layers of zwitterions on the surface. In the third chapter, we present a facile technique to fabricate antifouling membranes via dopamine and hydrophilic zwitterionic monomers containing methacrylate functional group. The existing approaches in the literature to enhance the membrane surface hydrophilicity, aiming to decrease the rate of fouling, suffer from complexity. The technique we propose in the third chapter is doable under room temperature and in one-step, which can easily be scaled up for water purification/wastewater reuse. In the fourth chapter, we study a new class of zwitterionic monomers containing amine functional group and their co-deposition with dopamine to improve the grafting density of zwitterions on the membrane surface. During the project described in the third chapter, we successfully demonstrated improved antifouling properties of both flat sheet membranes and membrane modules using methacrylate functionalized zwitterions. However, the loading of zwitterions on the surface was only ~11 wt%. In the last project, we demonstrated that zwitterions with amine groups can deposit more easily on the surface, through co-deposition with dopamine (upto ~31 wt%), compared with those containing methacrylate functional group. Polysulfone (PSf) UF membranes grafted with amine-containing zwitterions exhibited lower transport resistance, compared with pristine and methacrylate-functionalized counterparts, during a filtration experiment via a constant flux crossflow filtration apparatus and sodium alginate as the foulant.","**To request an accessible version of the file(s) associated with this item, contact library@buffalo.edu. Please include the item's persistent URL [http://hdl.handle.net/. . .] in your request.**"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/10477/83841"],"dc:language":["eng"],"dc:publisher":["State University of New York at Buffalo"],"dc:rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"dc:subject":["chemical engineering"],"dc:title":["Antifouling Membranes by Surface Modification using Hydrophilic Polymers"],"dc:type":["Text","Dissertation"]},"updated_at":"2026-07-27T19:05:28Z"}