Exploration of different adsorption performance and mechanisms of core-shell Fe3O4@Ce-Zr oxide composites for Cr(VI) and Sb(III)
| Autor: | Guangda Yu, Fenglian Fu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Oxide
Magnetic separation chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Redox 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound Electron transfer Colloid and Surface Chemistry Adsorption chemistry Antimony X-ray photoelectron spectroscopy Composite material 0210 nano-technology Magnetite |
| Zdroj: | Journal of Colloid and Interface Science. 576:10-20 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2020.05.008 |
| Popis: | Removal of toxic Cr(VI) and Sb(III) from wastewater is crucial owing to their potential hazard to the environment and human health. In this work, a novel magnetic composite, core-shell Fe3O4@Ce-Zr binary oxide (Mag@Ce-Zr), was synthesized by a simple and eco-friendly co-precipitation method to remove Cr(VI) and Sb(III). The synthetic Mag@Ce-Zr composites exhibited superior magnetic separation (saturation magnetization value was 43.8 emu/g), great maximum adsorption capacities toward Cr(VI) and Sb(III) (66.7 mg/g for Cr(VI) and 365.2 mg/g for Sb(III)) and remarkable regeneration and reusability property. The adsorption mechanisms of negatively charged Cr(VI) oxyanions involved electrostatic attraction and the formation of Ce/Zr-O-Cr complexes. However, Sb(III) was adsorbed mainly through surface complexation with abundant hydroxyl groups to form Ce/Zr-O-Sb complexes. More importantly, based on X-ray photoelectron spectroscopy analysis, partial Cr(VI) and Sb(III) were converted to less toxic Cr(III) and Sb(V) by the core Fe(II) and shell Ce(IV) of Mag@Ce-Zr through electron transfer during adsorption process. Results revealed that the Mag@Ce-Zr composites displayed greater potential in the removal of Sb(III) from wastewater owing to its higher affinity with antimony species. |
| Databáze: | OpenAIRE |
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