Publication:
Enhancement of reactive oxygen species production in nanoparticulate bimetallic zero-valent iron and dioxygen system
Enhancement of reactive oxygen species production in nanoparticulate bimetallic zero-valent iron and dioxygen system
dc.contributor.advisor | Hwang, Sangchul | |
dc.contributor.author | Morales-Parra, Ivan | |
dc.contributor.college | College of Engineering | en_US |
dc.contributor.committee | Rivera Santos, Jorge | |
dc.contributor.committee | Deng, Yang | |
dc.contributor.department | Department of Civil Engineering | en_US |
dc.contributor.representative | Marcelo Suarez, Oscar | |
dc.date.accessioned | 2019-01-17T17:01:20Z | |
dc.date.available | 2019-01-17T17:01:20Z | |
dc.date.issued | 2010 | |
dc.description.abstract | An 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.abstract | Una 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.graduationYear | 2010 | en_US |
dc.description.sponsorship | Puerto 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.identifier.uri | https://hdl.handle.net/20.500.11801/1679 | |
dc.language.iso | en | en_US |
dc.rights.holder | (c) 2010 Ivan Morales Parra | en_US |
dc.rights.license | All rights reserved | en_US |
dc.subject | Groundwater systems | en_US |
dc.subject.lcsh | Nanostructures materials -- Envionmental aspects | en_US |
dc.subject.lcsh | Iron -- Oxidation | en_US |
dc.subject.lcsh | Active oxygen | en_US |
dc.subject.lcsh | Environmental degradation | en_US |
dc.subject.lcsh | Pollutants -- Toxicology | en_US |
dc.title | Enhancement of reactive oxygen species production in nanoparticulate bimetallic zero-valent iron and dioxygen system | en_US |
dc.type | Thesis | en_US |
dspace.entity.type | Publication | |
thesis.degree.discipline | Civil Engineering | en_US |
thesis.degree.level | M.S. | en_US |