Morales-Parra, Ivan

Publication Search Results

Now showing 1 - 1 of 1

Enhancement of reactive oxygen species production in nanoparticulate bimetallic zero-valent iron and dioxygen system
(2010) Morales-Parra, Ivan; Hwang, Sangchul; College of Engineering; Rivera Santos, Jorge; Deng, Yang; Department of Civil Engineering; Suárez, O. Marcelo
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.