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Photovoltage response of (XZn)Fe2O4-BiFeO3 (X = Mg, Mn or Ni) interfaces for highly selective Cr3+, Cd2+, Co2+ and Pb2+ ions detection.
- Source :
-
Journal of Hazardous Materials . Aug2017, Vol. 336, p174-187. 14p. - Publication Year :
- 2017
-
Abstract
- High-photostability fluorescent (XZn)Fe 2 O 4 (X = Mg, Mn or Ni) embedded in BiFeO 3 spinel-perovskite nanocomposites were successfully fabricated via a novel bio-induced phase transfer method using shewanella oneidensis MR-1. These nanocomposites have the near-infrared fluorescence response (XZn or Fe)-O-O-(Bi) interfaces (785/832 nm), and the (XZn)Fe 2 O 4 /BiFeO 3 lattices with high/low potentials (572.15–808.77 meV/206.43–548.1 meV). Our results suggest that heavy metal ion (Cr 3+ , Cd 2+ , Co 2+ and Pb 2+ ) d↓ orbitals hybridize with the paired-spin X-Zn-Fe d↓-d↓-d↑↓ orbitals to decrease the average polarization angles (−29.78 to 44.71°), qualitatively enhancing the photovoltage response selective potentials (39.57–487.84 meV). The fluorescent kinetic analysis shows that both first-order and second-order equilibrium adsorption isotherms are in line and meet the Langmuir and Freundlich modes. Highly selective fluorescence detection of Co 2+ , Cr 3+ and Cd 2+ can be achieved using Fe 3 O 4 -BiFeO 3 (Langmuir mode), (MgZn)Fe 2 O 4 -BiFeO 3 and (MnZn)Fe 2 O 4 -BiFeO 3 (Freundlich mode), respectively. Where the corresponding max adsorption capacities (q max ) are 1.5–1.94, 35.65 and 43.7 multiple, respectively, being more competitive than that of other heavy metal ions. The present bio-synthesized method might be relevant for high-photostability fluorescent spinel-perovskite nanocomposites, for design of heavy metal ion sensors. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03043894
- Volume :
- 336
- Database :
- Academic Search Index
- Journal :
- Journal of Hazardous Materials
- Publication Type :
- Academic Journal
- Accession number :
- 123308785
- Full Text :
- https://doi.org/10.1016/j.jhazmat.2017.04.071