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dc.contributor.advisorSuleiman-Rosado, David
dc.contributor.authorPagán-Pagán, Nataira M.
dc.description.abstractThis study describes the synthesis and characterization of sulfonated poly(styreneisobutylene- styrene) (SIBS) polymer nanocomposite membranes, which show antibacterial properties useful for the inactivation of Enterococci and Escherichia coli (E. coli) pathogenic bacteria present in surface waters, particularly when cupric (Cu2+) and ferric (Fe3+) counter-ions were cross-linked to the membrane. The antibacterial evaluation of copper-exchanged and ironexchanged sulfonated SIBS was carried out by assaying the presence of Enterococci and E. coli bacteria after the membranes were brought into contact with bacteria suspensions. Overall, the cell viability results obtained suggested that Enterococci was more susceptible to inactivation than E. coli and that copper-exchanged sulfonated SIBS successfully inactivated most of both pathogenic bacteria. It was found that copper-exchanged sulfonated SIBS was more selective to E. coli and iron-exchanged sulfonated SIBS was more selective to Enterococci bacteria although the extent of inactivation varied depending on the water source, treatment time, the water sample volume and initial concentration of the bacteria suspensions. Moreover, it was observed that the inactivation of E. coli was strongly influenced by the degree of sulfonation, since it was found to be dependent on the quantity of the Cu2+ exchanged in the copper-exchanged sulfonated SIBS membrane. The physico-chemical properties of copper-exchanged and iron-exchanged sulfonated SIBS were influenced by the exposure to bacteria suspensions nevertheless, the antibacterial properties of the membranes were not compromised since, with reusable membranes, nearly 0% cell viability was obtained.en_US
dc.description.abstractEste estudio describe la síntesis y caracterización de membranas poli(estireno-isobutilenoestireno) (SIBS) sulfonado, las cuales presentan propiedades antibacterianas útiles para la inactivación de bacterias patógenas Enterococci y Escherichia coli (E. coli), las cuales están presentes en aguas superficiales, particularmente cuando contraiones cúpricos (Cu+2) y férricos (Fe 3+) se entrelazan en la membrana. La evaluación antibacteriana de SIBS sulfonado intercambiado con cobre e intercambiado con hierro se llevó a cabo mediante el ensayo de la presencia de bacterias Enterococci y E. coli, después de que las membranas se pusieran en contacto con suspensiones de bacterias. En general, los resultados obtenidos de viabilidad celular sugirieron que las bacterias Enterococci eran más susceptibles a la inactivación que las bacterias E. coli, y que membranas de SIBS sulfonado intercambiado con cobre inactivaban la mayoría de las bacterias patógenas. Se encontró que el SIBS sulfonado intercambiado con cobre era más selectivo a bacterias E. coli y el SIBS sulfonado intercambiado con hierro era más selectivo a bacterias Enterococci, aunque el grado de inactivación variaba según la fuente de agua, el tiempo de tratamiento, el volumen de agua de la muestra analizada y la concentración inicial de las suspensiones de bacteria. Además, se observó que la inactivación de E. coli estaba fuertemente influenciada por el grado de sulfonación, ya que se encontró que la inactivación dependía de la cantidad de Cu2 + intercambiado en la membrana SIBS sulfonada. Las propiedades físico-químicas de SIBS sulfonado intercambiado con cobre e intercambiado con hierro se vieron influenciadas por la exposición a suspensiones de bacterias, sin embargo, las propiedades antibacterianas de las membranas no se vieron comprometidas ya que, con membranas reutilizables, se obtuvo casi 0% de viabilidad celular.en_US
dc.description.sponsorshipPuerto Rico Science, Technology and Research Trusten_US
dc.subjectWater--Purification--Disinfection - Sulfonated poly(styreneisobutylene- styrene) polymer nanocomposite membranes - Effect onen_US
dc.subjectSulfonated polymer nanocomposite membranes - Synthesis - Antibacterial propertiesen_US
dc.subjectSulfonation - Effect on - Enterococci and Escherichia coli (E. coli)en_US
dc.subject.lcshOrganic conductorsen_US
dc.subject.lcshNanocomposites (Materials)en_US
dc.subject.lcshMembranes (Technology)en_US
dc.subject.lcshAntibacterial agentsen_US
dc.subject.lcshWater -- Purification -- Microbial removalen_US
dc.titleSulfonated polymer metal nanocomposite membranes with bacterial disinfection activity in wateren_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2018 Nataira Marie Pagán-Pagánen_US
dc.contributor.committeeTarafa Vélez, Pedro J.
dc.contributor.committeeBogere, Moses N.
dc.contributor.committeeMontalvo Rodríguez, Rafael R.
dc.contributor.committeeAcevedo Rullán, Aldo
dc.contributor.representativeCortés Figueroa, José E. Engineeringen_US
dc.contributor.collegeCollege of Engineeringen_US
dc.contributor.departmentDepartment of Chemical Engineeringen_US

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