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dc.contributor.advisorHwang, Sangchul
dc.contributor.authorMorales-Parra, Ivan
dc.description.abstractAn emerging remediation process involving nanoscale zero-valent iron (nZVI) and dioxygen (O2) has recently been demonstrated to chemically destroy a variety of organic species via oxidation. The degradation of these organic pollutants may be attributed to reactive oxygen species (ROS) production. This study is to enhance the ROS yield using bimetallic nZVI particles. ROS were measured under different species and contents of secondary metals and quantified by indirect probe compound tests. The ROS production was monitored over a pH range of 3-9 by measuring oxidation byproducts, formaldehyde (HCHO) and acetone. The results exhibits higher (HCHO) concentration levels, from the oxidation of methanol, for bimetallic nZVI than ZVI. At circumneutral pH , bimetallic nZVI with [Pd]/[Fe] = 5%, [Ni]/[Fe] = 10% and [Ag]/[Fe] =1%, produced 22%, 93% and 87% higher HCHO concentration compared to nZVI, respectively, due probably to greater ROS production . The second metal additive increases significantly the ROS production, having an important effect on the mechanisms of ZVI-mediated oxidation.
dc.description.abstractUna nueva técnica de remediación que involucra la utilización de hierro de cero valencia a escala nano (nZVI) en presencia de dioxígeno (O2) ha sido investigada, demostrándose que puede destruir una gran variedad de contaminantes a través del proceso de oxidación. La degradación de contaminantes es llevada a cabo por la creación de especies reactivas oxidantes (ERO). El propósito de esta investigación es el incremento de estas especies oxidantes utilizando nanopartículas bimetálicas de hierro de cero valencia. Para poder analizar las ERO fue necesario crear diferentes tipos de nanoparticulas bimetálicas y contenidos de segundos metales agregados a la superficie de las nanoparticulas de hierro. La producción de ERO fue monitoreada en un rango de pH de 3 hasta 9. Como resultado, se observan niveles más altos de formaldehido (HCHO) en las nanoparticulas bimetálicas donde las mismas con [Pd]/[Fe] = 5%, [Ni]/[Fe] = 10% and [Ag]/[Fe] =1%, produjeron 22%, 93% y 87% más HCHO que las partículas no bimetálicas, teniendo un gran efecto en el incremento de las ERO.
dc.description.sponsorshipPuerto Rico NSF-EPSCoR/RII Institute of Functional Nanomaterials through the New Faculty Start-Up Award for the financial support and the Department of Civil Engineering and Surveying at the University of Puerto Rico at Mayagüez and Environmental Engineering Laboratory.en_US
dc.subjectGroundwater systemsen_US
dc.subject.lcshNanostructures materials -- Envionmental aspectsen_US
dc.subject.lcshIron -- Oxidationen_US
dc.subject.lcshActive oxygenen_US
dc.subject.lcshEnvironmental degradationen_US
dc.subject.lcshPollutants -- Toxicologyen_US
dc.titleEnhancement of reactive oxygen species production in nanoparticulate bimetallic zero-valent iron and dioxygen systemen_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2010 Ivan Morales Parraen_US
dc.contributor.committeeRivera Santos, Jorge
dc.contributor.committeeDeng, Yang
dc.contributor.representativeMarcelo Suarez, Oscar Engineeringen_US
dc.contributor.collegeCollege of Engineeringen_US
dc.contributor.departmentDepartment of Civil Engineeringen_US

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