{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/98380"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/98380","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Effect of iodination on NF270 nanofiltration membrane structure and performance","abstract":"Made available in DSpace on 2017-09-29T17:56:46Z (GMT). No. of bitstreams: 2 LEVATO-THESIS-2017.pdf: 2402000 bytes, checksum: 8c4f49706ddd057c5afa20f7897ce3cd (MD5) LICENSE.txt: 4213 bytes, checksum: 3a65aed08aeda2d8e61923f83a1c2953 (MD5) Previous issue date: 2017-07-14","abstract_html":"Made available in DSpace on 2017-09-29T17:56:46Z (GMT). No. of bitstreams: 2 LEVATO-THESIS-2017.pdf: 2402000 bytes, checksum: 8c4f49706ddd057c5afa20f7897ce3cd (MD5) LICENSE.txt: 4213 bytes, checksum: 3a65aed08aeda2d8e61923f83a1c2953 (MD5) Previous issue date: 2017-07-14","abstract_has_math":false,"creators":["Levato, Gabrielle A"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Environ Engr in Civil Engr","degree_department":null,"school":null,"contributors":["Mariñas, Benito J."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2017,"date_issued":"2017-09-29T17:56:46Z","date_published":"2017-09-29T17:56:46Z","updated_at":"2026-07-22T22:24:35Z","subjects":["Nanofiltration","Semi-aromatic polyamide membranes","Iodination","X-ray photoelectron spectroscopy (XPS)","Rutherford backscattering spectrometry (RBS)","Attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR)","Rhodamine-WT (RWT) rejection","Sodium chloride (NaCl) rejection"],"languages":["en"],"rights":["Copyright 2017 Gabrielle Levato"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/98380","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Mariñas, Benito J."]},{"key":"dc:creator","label":"Author","values":["Levato, Gabrielle A"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2017-09-29T17:56:46Z","2017-07-14","2017-08"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Environ Engr in Civil Engr"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Nanofiltration","Semi-aromatic polyamide membranes","Iodination","X-ray photoelectron spectroscopy (XPS)","Rutherford backscattering spectrometry (RBS)","Attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR)","Rhodamine-WT (RWT) rejection","Sodium chloride (NaCl) rejection"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2017 Gabrielle Levato"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/98380"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Made available in DSpace on 2017-09-29T17:56:46Z (GMT). No. of bitstreams: 2 LEVATO-THESIS-2017.pdf: 2402000 bytes, checksum: 8c4f49706ddd057c5afa20f7897ce3cd (MD5) LICENSE.txt: 4213 bytes, checksum: 3a65aed08aeda2d8e61923f83a1c2953 (MD5) Previous issue date: 2017-07-14","Previous research on free chlorination and chloramination of nanofiltration (NF) and reverse osmosis (RO) polyamide membranes has conclusively shown that these water disinfectants damage the structural integrity of membranes and adversely affect their performance. Secondary oxidants formed from reactions of chlorine disinfectants with bromide and iodide ions have also been found to transform the active layers and affect the performance of fully aromatic polyamide membranes, but the effects on semi-aromatic polyamide membranes are still unreported. This work investigates how exposure to a secondary oxidant, hypoiodous acid (HOI), changes the active layer and rejection performance of the semi-aromatic polyamide membrane NF270. Small coupons of membrane were contacted with HOI solutions at various exposure levels. Exposed coupons were analyzed by X-ray photoelectron spectroscopy, Rutherford backscattering spectrometry, and attenuated total reflectance - Fourier transform infrared spectroscopy to monitor the chemical structure of the membrane active layer. Changes in membrane performance were assessed by performing permeation experiments with Rhodamine-WT (R-WT) and sodium chloride (NaCl) solutions. Structural analysis revealed iodination of the active layer, but at levels that did not result in changes in water permeability or the rejection of R-WT and NaCl.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2017-09-29 without embargo terms","The student, Gabrielle Levato, accepted the attached license on 2017-07-12 at 13:27.","The student, Gabrielle Levato, submitted this Thesis for approval on 2017-07-12 at 13:49.","This Thesis was approved for publication on 2017-07-14 at 14:31.","DSpace SAF Submission Ingestion Package generated from Vireo submission #11428 on 2017-09-29 at 11:29:56"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Effect of iodination on NF270 nanofiltration membrane structure and performance"]}]}],"canonical_facts":{"dc:contributor":["Mariñas, Benito J."],"dc:creator":["Levato, Gabrielle A"],"dc:date":["2017-09-29T17:56:46Z","2017-07-14","2017-08"],"dc:description":["Made available in DSpace on 2017-09-29T17:56:46Z (GMT). No. of bitstreams: 2 LEVATO-THESIS-2017.pdf: 2402000 bytes, checksum: 8c4f49706ddd057c5afa20f7897ce3cd (MD5) LICENSE.txt: 4213 bytes, checksum: 3a65aed08aeda2d8e61923f83a1c2953 (MD5) Previous issue date: 2017-07-14","Previous research on free chlorination and chloramination of nanofiltration (NF) and reverse osmosis (RO) polyamide membranes has conclusively shown that these water disinfectants damage the structural integrity of membranes and adversely affect their performance. Secondary oxidants formed from reactions of chlorine disinfectants with bromide and iodide ions have also been found to transform the active layers and affect the performance of fully aromatic polyamide membranes, but the effects on semi-aromatic polyamide membranes are still unreported. This work investigates how exposure to a secondary oxidant, hypoiodous acid (HOI), changes the active layer and rejection performance of the semi-aromatic polyamide membrane NF270. Small coupons of membrane were contacted with HOI solutions at various exposure levels. Exposed coupons were analyzed by X-ray photoelectron spectroscopy, Rutherford backscattering spectrometry, and attenuated total reflectance - Fourier transform infrared spectroscopy to monitor the chemical structure of the membrane active layer. Changes in membrane performance were assessed by performing permeation experiments with Rhodamine-WT (R-WT) and sodium chloride (NaCl) solutions. Structural analysis revealed iodination of the active layer, but at levels that did not result in changes in water permeability or the rejection of R-WT and NaCl.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2017-09-29 without embargo terms","The student, Gabrielle Levato, accepted the attached license on 2017-07-12 at 13:27.","The student, Gabrielle Levato, submitted this Thesis for approval on 2017-07-12 at 13:49.","This Thesis was approved for publication on 2017-07-14 at 14:31.","DSpace SAF Submission Ingestion Package generated from Vireo submission #11428 on 2017-09-29 at 11:29:56"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/98380"],"dc:language":["en"],"dc:rights":["Copyright 2017 Gabrielle Levato"],"dc:subject":["Nanofiltration","Semi-aromatic polyamide membranes","Iodination","X-ray photoelectron spectroscopy (XPS)","Rutherford backscattering spectrometry (RBS)","Attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR)","Rhodamine-WT (RWT) rejection","Sodium chloride (NaCl) rejection"],"dc:title":["Effect of iodination on NF270 nanofiltration membrane structure and performance"],"dc:type":["text"],"thesis:degree_discipline":["Environ Engr in Civil Engr"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:35Z"}