Biosynthesized magnetite-perovskite (XFe2O4-BiFeO3) interfaces for toxic trace metal removal from aqueous solution
| Autor: | Shuhui Sun, Mian-xin Song, Jianan Nie, Xiaoqiang Jiang, Hailiang Dong, Ping He, Faqin Dong, Liang Bian, Xiaobin Gu, Yuwei Chen, Huichao He, Nelson Belzile, Limin Zhang |
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| Rok vydání: | 2018 |
| Předmět: |
Aqueous solution
Materials science biology Process Chemistry and Technology Inorganic chemistry 02 engineering and technology Shewanella putrefaciens 010402 general chemistry 021001 nanoscience & nanotechnology biology.organism_classification 01 natural sciences Shewanella 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Materials Chemistry Ceramics and Composites Trace metal Freundlich equation Shewanella oneidensis 0210 nano-technology Perovskite (structure) Magnetite |
| Zdroj: | Ceramics International. 44:21210-21220 |
| ISSN: | 0272-8842 |
| Popis: | X-modified magnetite (XFe 2 O 4 ; X = Cr, Mn, Fe, Co or Ni) was synthesized from goethite reduction, and inserted into the Fe-vacancy of perovskite (BiFeO 3 ), via microbial Fe 3+ →Fe 2+ reduction by Shewanella (e.g. Shewanella oneidensis MR-1 and Shewanella putrefaciens CN32). We demonstrated that the average adsorption intensities of nine toxic trace metals (Cr 3+ , Mn 2+ , Co 2+ , Ni 2+ , Cu 2+ , Zn 2+ , Cd 2+ , Pb 2+ , and Hg 2+ ), in Freundlich mode were 8.29–10.79 multiples higher than that in Langmuir mode, being more competitive than previously reported values. The fluorescence quenching is attributed to the orbital hybridization of molecular oxygen activation and trace metal (M) ions, which weakens the X 2+ -O-Fe 3+ -O-(Fe 3+ ) coupling orbital. In addition Shewanella putrefaciens CN32 creates more oxygen vacancies to modify Ni↓-Fe↓-O↑ d*-p hybridized orbitals for enhancing the local spin-orbit coupling with Cd-4d 10 . This design idea can be extended to other direct biosynthetic magnetite-perovskite as highly efficient toxic trace metal removal agents. |
| Databáze: | OpenAIRE |
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