Monitoring the role of Mn and Fe in the As-removal efficiency of tetravalent manganese feroxyhyte nanoparticles from drinking water: An X-ray absorption spectroscopy study
| Autor: | Maria Katsikini, Konstantinos Simeonidis, Fani Pinakidou, Evangelia Mitraka, Manassis Mitrakas, E. C. Paloura |
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| Rok vydání: | 2016 |
| Předmět: |
X-ray absorption spectroscopy
Extended X-ray absorption fine structure Inorganic chemistry chemistry.chemical_element 02 engineering and technology Manganese 010501 environmental sciences engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Feroxyhyte Surfaces Coatings and Films Electronic Optical and Magnetic Materials X-ray absorption fine structure Biomaterials Colloid and Surface Chemistry Adsorption Polymerization chemistry engineering Absorption (chemistry) 0210 nano-technology 0105 earth and related environmental sciences |
| Zdroj: | Journal of colloid and interface science. 477 |
| ISSN: | 1095-7103 |
| Popis: | The implementation of amorphous tetravalent manganese feroxyhyte (TMFx) nanoparticles, prepared via co-precipitation synthesis, as an efficient As(V)-removal material is investigated using X-ray absorption fine structure (XAFS) spectroscopy at the Fe-, Mn- and As-K-edges. The optimum synthesis conditions and chemical composition of the TMFx adsorbent were determined by the degree of polymerization in the adsorbents' microstructure. Under synthesis into mildly acidic conditions, the change in the polymerization of the metal-oxyhydroxyl chains (metal=Fe, Mn) provides more adsorption sites at edges and corner sites in the bonding environment of Fe and Mn, respectively, thereby enhancing As uptake. After exposure to As-polluted water, similar microstructural changes related to As-bidentate and monodentate geometries are generated: As(V) preferentially occupies the high energy adsorption sites ((2)C complexes) available in the Mn-oxyhydroxyl groups and the low energy edge sites offered by Fe ((2)E complexes). It is revealed that optimum arsenic-removal by TMFx occurs into mildly acidic synthesis pH and for iron to manganese molar ratio equal to 3. |
| Databáze: | OpenAIRE |
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