Reciprocal influences of dissolved organic matter and nanosized zero-valent iron in aqueous media
| Autor: | Yu-Ping Chin, Cheolyong Kim, Brandon C. McAdams, Maya Li Wei-Haas, Jun-Young Ahn, Inseong Hwang |
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| Rok vydání: | 2018 |
| Předmět: |
Environmental Engineering
010504 meteorology & atmospheric sciences Absorption spectroscopy Iron Health Toxicology and Mutagenesis Inorganic chemistry Oxide 010501 environmental sciences 01 natural sciences Fluorescence spectroscopy Electron transfer chemistry.chemical_compound Dissolved organic carbon Environmental Chemistry 0105 earth and related environmental sciences chemistry.chemical_classification X-ray absorption spectroscopy Zerovalent iron Chemistry Public Health Environmental and Occupational Health Water General Medicine General Chemistry Electron acceptor Pollution Microscopy Fluorescence Oxidation-Reduction Water Pollutants Chemical |
| Zdroj: | Chemosphere. 193:936-942 |
| ISSN: | 0045-6535 |
| DOI: | 10.1016/j.chemosphere.2017.11.097 |
| Popis: | We investigated concurrent effects between nano-sized zero-valent iron (NZVI) and dissolved organic matter (DOM). Specific UV absorbance of DOM revealed that aromatic/hydrophobic moieties of DOM were bounded to NZVI surfaces. The DOM fluorescence emission peak shifted toward lower wavelength after NZVI exposure, which indicated removal of aromatic DOM fractions. This blue shift of the emission peak also attributes to the reduction of electron acceptors through NZVI-DOM charge transfer complexes. High molecular weight (103-104 Da) DOM fractions, which are suspected to be both aromatic and hydrophobic, were removed. X-ray absorption spectroscopy (XAS) elucidated that Fe(0) content in the 30-d aged NZVI in the presence of DOM (61.6%) was substantially higher than that in the absence of DOM (25.0%). Corrosion and oxidation of NZVI were mitigated due to interruption of electron transfer by surface bounded DOM and stabilization of Fe(II) by Fe-DOM complexes. The XAS also revealed that the evolution of the iron (oxyhydr)oxide shell of NZVI was significantly altered by complexed aromatic DOM. |
| Databáze: | OpenAIRE |
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