Transport of metal oxide nanoparticles in saturated porous media
| Autor: | Ishai Dror, Brian Berkowitz, Tal Ben-Moshe |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Environmental Engineering
Health Toxicology and Mutagenesis Nanoparticle Metal Nanoparticles Environmental Chemistry Humic acid Packed bed chemistry.chemical_classification Titanium Aqueous solution Chromatography Chemistry Public Health Environmental and Occupational Health General Medicine General Chemistry Pollution Ferrosoferric Oxide Titanium oxide Volumetric flow rate Kinetics Chemical engineering Ionic strength Zinc Oxide Porous medium Porosity Copper Water Pollutants Chemical |
| Zdroj: | Chemosphere. 81(3) |
| ISSN: | 1879-1298 |
| Popis: | The behavior of four types of untreated metal oxide nanoparticles in saturated porous media was studied. The transport of Fe3O4, TiO2, CuO, and ZnO was measured in a series of column experiments. Vertical columns were packed with uniform, spherical glass beads. The particles were introduced as a pulse suspended in aqueous solutions and breakthrough curves at the outlet were measured using UV–vis spectrometry. Different factors affecting the mobility of the nanoparticles such as ionic strength, addition of organic matter (humic acid), flow rate and pH were investigated. The experiments showed that mobility varies strongly among the nanoparticles, with TiO2 demonstrating the highest mobility. The mobility is also strongly affected by the experimental conditions. Increasing the ionic strength enhances the deposition of the nanoparticles. On the other hand, addition of humic acid increases the nanoparticle mobility significantly. Lower flow rates again led to reduced mobility, while changes in pH had little effect. Overall, in natural systems, it is expected that the presence of humic acid in soil and aquifer materials, and the ionic strength of the resident water, will be key factors determining nanoparticle mobility. |
| Databáze: | OpenAIRE |
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