Photovoltage response of (XZn)Fe 2 O 4 -BiFeO 3 (X = Mg, Mn or Ni) interfaces for highly selective Cr 3+ , Cd 2+ , Co 2+ and Pb 2+ ions detection
| Autor: | Mian-xin Song, Xiaoyan Zhang, Lei Xie, Jing Li, Xiao-qin Nie, Xin-xi Li, Liang Bian, Hailiang Dong, Jianan Nie, Yu-jin Li, Hai-long Li, Li-sheng Wang, Faqin Dong |
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| Rok vydání: | 2017 |
| Předmět: |
Langmuir
Environmental Engineering Materials science Health Toxicology and Mutagenesis Metal ions in aqueous solution Analytical chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Pollution Fluorescence 0104 chemical sciences Ion Metal Adsorption visual_art visual_art.visual_art_medium Environmental Chemistry Freundlich equation 0210 nano-technology Polarization (electrochemistry) Waste Management and Disposal |
| Zdroj: | Journal of Hazardous Materials. 336:174-187 |
| ISSN: | 0304-3894 |
| Popis: | High-photostability fluorescent (XZn)Fe2O4 (X = Mg, Mn or Ni) embedded in BiFeO3 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)Fe2O4/BiFeO3 lattices with high/low potentials (572.15–808.77 meV/206.43–548.1 meV). Our results suggest that heavy metal ion (Cr3+, Cd2+, Co2+ and Pb2+) 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 Co2+, Cr3+ and Cd2+ can be achieved using Fe3O4-BiFeO3 (Langmuir mode), (MgZn)Fe2O4-BiFeO3 and (MnZn)Fe2O4-BiFeO3 (Freundlich mode), respectively. Where the corresponding max adsorption capacities (qmax) 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. |
| Databáze: | OpenAIRE |
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