Date of Award
Master of Arts (MA)
College of Science and Mathematics
Earth and Environmental Studies
Thesis Sponsor/Dissertation Chair/Project Chair
Nanomaterial (NM) based manufacturing is predicted to grow to 15% of the global manufacturing economy by 2014. Subsequent to their use, most of the engineered nanomaterials (ENMs), man-made particles with at least dimension between 1 and 100 nm, will be disposed of in landfills. Landfill leachate is highly contaminated wastewater containing a variety of constituents that may affect the fate and transport of the nanomaterials. In this study, the size and zeta potential of cerium oxide (CeO2), an industrially important nanomaterial, was investigated in different solution matrices (Milli-Q water, a real landfill leachate, KC1 solution, and humic acid solution). The KC1 and humic acid solutions were used to examine the effects of inorganic ions and humic substances in leachate on the stability of CeO2 nanoparticles. Factors including pH (pH 4 and 8 ) and CeO2 concentrations (0.5 and 0.1 mg/mL) were also evaluated. Results show that the sizes and zeta potentials of the nanoparticles were very stable in the control (Milli-Q water) and humic acid groups but unstable in the leachate and inorganic salt (KC1) solutions. A low pH (pH 4.0) appeared to favor dispersion of the nanoparticles, compared with a high pH (pH 8.0). This study demonstrates that a high pH and inorganic salt concentration facilitated the aggregation of CeO2 nanoparticles.
Ezyske, Casey Marie, "Fate of Cerium Oxide (CeO₂), Nanoparticles in Landfill Leachate" (2012). Theses, Dissertations and Culminating Projects. 831.