| Autor: |
Asimakidou, T., Kalaitzidou, K., Tsingenopoulou, Z., Martinez-Boubeta, C., Venegas-Gomez, A., Teran, F. J., Balcells, Lluis, Simeonidis, K. |
| Zdroj: |
Nanotechnology for Environmental Engineering; September 2024, Vol. 9 Issue: 3 p287-297, 11p |
| Abstrakt: |
Public and authorities concern about the worldwide intensity and the long-term health risks arising by the presence of hexavalent chromium in drinking water resources initiated a combined effort to set new conformance regulations and develop novel and sustainable methods to purify polluted water. This study examines the effect of the chemical environment during the synthesis of Fe3O4nanoparticles through the oxidative precipitation of Fe2+salts. In addition to determining the morphological and structural characteristics of nanomaterials as a function of the release of various counterions from the reagents involved in the process, the main objective of this work was to find the optimal conditions that result in maximum adsorption capacity for the elimination of hexavalent chromium species in natural water. Results indicate that replacing FeSO4by FeCl2improves efficiency by around 35%, achieving concentrations below the regulatory limit of 25 μg/L and with an adsorption capacity of 2.8 mg/g. This finding was attributed to the formation of smaller nanoparticles (approximately 28 nm), which provided a greater specific surface area. However, the use of Mohr's salt or replacement of the alkalinity controller with KOH inhibits the increase of pH, resulting in large aggregates with low Cr(VI) uptake capacity. Conversely, replacing the oxidizing agent with KNO3, or reducing the ethanol percentage, does not modify the geometry of the particles but interferes the decomposition process of the green rust. Qualified Fe3O4nanoparticles were used to validate the correlation between Cr(VI) loading and magnetization cycles obtained by AC magnetometry. Preliminary results showed a linear dependence of the dynamical remanence and Cr(VI) capture. Hence, this demonstrates the possibility of establishing novel sensor devices to monitor water quality and evaluate the operational life of the adsorbent. |
| Databáze: |
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