Transport and deposition of Suwannee River Humic Acid/Natural Organic Matter formed silver nanoparticles on silica matrices: The influence of solution pH and ionic strength
| Autor: | Mary Sohn, Nelson Akaighe, Sarbajit Banerjee, Sean W. Depner |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Silver
Environmental Engineering Light Silicon dioxide Health Toxicology and Mutagenesis Inorganic chemistry Metal Nanoparticles Silver nanoparticle Metal chemistry.chemical_compound Microscopy Electron Transmission Rivers Dynamic light scattering Zeta potential Scattering Radiation Environmental Chemistry Humic acid Environmental Restoration and Remediation Humic Substances chemistry.chemical_classification Chemistry Spectrophotometry Atomic Osmolar Concentration Public Health Environmental and Occupational Health General Medicine General Chemistry Hydrogen-Ion Concentration Silicon Dioxide Pollution Ionic strength visual_art visual_art.visual_art_medium Spectrophotometry Ultraviolet Oxidation-Reduction Deposition (chemistry) |
| Zdroj: | Chemosphere. 92:406-412 |
| ISSN: | 0045-6535 |
| DOI: | 10.1016/j.chemosphere.2012.12.077 |
| Popis: | The transport and deposition of silver nanoparticles (AgNPs) formed from Ag(+) reduction by Suwannee River Humic Acid (SRHA) and Suwannee River Natural Organic Matter (SRNOM) utilizing a silica matrix is reported. The morphology and stability of the AgNPs was analyzed by transmission electron microscopy (TEM), dynamic light scattering (DLS) and zeta potential measurements. The percentage conversion of the initial [Ag(+)] to [AgNPs] was determined from a combination of atomic absorption (AAS) and UV-Vis spectroscopy, and centrifugation techniques. The results indicate higher AgNP transport and consequently low deposition in the porous media at basic pH conditions and low ionic strength. However, at low acidic pH and high ionic strength, especially with the divalent metallic cations, the mobility of the AgNPs in the porous media was very low, most likely due to NP aggregation. Overall, the results suggest the potential for AgNP contamination of subsurface soils and groundwater aquifers is mostly dependent on their aggregation state, controlled by the soil water and sediment ionic strength and pH. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect