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Research on Chemical Intermediates

, Volume 46, Issue 1, pp 715–736 | Cite as

α-Fe2O3@carbon core–shell nanostructure for luminescent upconversion and photocatalytic degradation of methyl orange

  • Gnanasekaran MunusamyEmail author
  • Rajaboopathi Mani
  • Krishnakumar VaradharajanEmail author
  • Surumbarkuzhali Narasimhan
  • Chitharaj Munusamy
  • Boopathy Chandrasekaran
Article

Abstract

The unique characteristics of metal–organic frameworks such as structural tunability, high surface area, low density, and tailored porosity have made this material suitable for different applications, compared to mineralized carbons. To improve the photocatalytic activity of α-Fe2O3, a shell of carbon with different concentrations on the core of α-Fe2O3 was prepared via hydrothermal method. The optical property, crystal phase, and morphology of the synthesized materials were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, energy-dispersive X-ray spectrometer, scanning electron microscopy, and high-resolution transmission electron microscopy (HR-TEM). The HR-TEM shows a single-sphere core–shell structure of α-Fe2O3 at higher concentration of carbon (αFC3), which showed a maximum degradation of pollutant about 85% in 2 h and 40 min. It is reasoned that the major dominants O2·– and h+ enhance the degradation. The Fe3+ ions strongly promote the upconversion emission observed at excitation of 620 nm. Photocurrent and Mott–Schottky revealed that the αFC3 core–shell sample shows that the − 0.157 flat-band potential (Vfb) increased the carrier density in the near-surface region accelerating the redox performances. In short, the excellent visible light degradation ability of αFC3 against the methyl orange and high upconversion efficiency were observed in α-Fe2O3@carbon core–shell nanostructure.

Graphic abstract

Keywords

α-Fe2O3 Core–shell Photoluminescence Methylene orange Photocatalytic activity 

Notes

Acknowledgements

The author M. Gnanasekaran thanks to Department of Nanoscience and Nanotechnology, Karunya University, and Sophisticated Test and Instrumentation Centre, Kochi University, Kochi, 682 022, Kerala, India, for the support of analytical measurements.

Author contributions

All the authors contributed to the discussion and preparation part of the manuscript. The final version of the manuscript was approved by all authors.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  • Gnanasekaran Munusamy
    • 1
    Email author
  • Rajaboopathi Mani
    • 2
  • Krishnakumar Varadharajan
    • 1
    Email author
  • Surumbarkuzhali Narasimhan
    • 3
  • Chitharaj Munusamy
    • 1
  • Boopathy Chandrasekaran
    • 1
  1. 1.School of Physical SciencesPeriyar UniversitySalemIndia
  2. 2.Centre for Research and DevelopmentPRIST Deemed to be UniversityThanjavurIndia
  3. 3.Department of PhysicsGovernment Arts CollegeSalemIndia

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