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Preparation of improved catalytic materials for water purification

Hyperfine Interactions volume 226, pages 517–527 (2014)Cite this article

Abstract

The aim of presented paper was to study preparation of catalytic materials for water purification. Iron oxide (Fe3O4) samples supported on activated carbon were prepared by wet impregnation method and low temperature heating in an inert atmosphere. The as-prepared, activated and samples after catalytic test were characterized by Mössbauer spectroscopy and X-ray diffraction. The obtained X-ray diffraction patterns of prepared samples show broad and low-intensity peaks of magnetite phase and the characteristic peaks of the activated carbon. The average crystallite size of magnetite particles was calculated below 20 nm. The registered Mössbauer spectra of prepared materials show a superposition of doublet lines or doublet and sextet components. The calculated hyperfine parameters after spectra evaluation reveal the presence of magnetite phase with nanosize particles. Relaxation phenomena were registered in both cases, i.e. superparamagnetism or collective magnetic excitation behavior, respectively. Low temperature Mössbauer spectra confirm this observation. Application of materials as photo-Fenton catalysts for organic pollutions degradation was studied. It was obtained high adsorption degree of dye, extremely high reaction rate and fast dye degradation. Photocatalytic behaviour of a more active sample was enhanced using mechanochemical activation (MCA). The nanometric size and high dispersion of photocatalyst particles influence both the adsorption and degradation mechanism of reaction. The results showed that all studied photocatalysts effectively decompose the organic pollutants under UV light irradiation. Partial oxidation of samples after catalytic tests was registered. Combination of magnetic particles with high photocatalytic activity meets both the requirements of photocatalytic degradation of water contaminants and that of recovery for cyclic utilization of material.

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Authors and Affiliations

  1. Institute of Catalysis, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bld. 11, Sofia, 1113, Bulgaria

    Z. Cherkezova-Zheleva, D. Paneva, B. Kunev & I. Mitov

  2. Faculty of Chemistry, University of Sofia, 1, J. Bourchier Blvd., Sofia, 1164, Bulgaria

    M. Tsvetkov & M. Milanova

  3. Institute of Organic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bld. 9, Sofia, 1113, Bulgaria

    N. Petrov

Authors
  1. Z. Cherkezova-Zheleva
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  2. D. Paneva
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  3. M. Tsvetkov
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  4. B. Kunev
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  5. M. Milanova
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  6. N. Petrov
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  7. I. Mitov
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Correspondence to Z. Cherkezova-Zheleva.

Additional information

Proceedings of the 32nd International Conference on the Applications of the Mössbauer Effect (ICAME 2013) held in Opatija, Croatia, 1–6 September 2013

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Cherkezova-Zheleva, Z., Paneva, D., Tsvetkov, M. et al. Preparation of improved catalytic materials for water purification. Hyperfine Interact 226, 517–527 (2014). https://doi.org/10.1007/s10751-013-0976-5

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  • DOI: https://doi.org/10.1007/s10751-013-0976-5

Keywords

  • Nano-sized supported magnetite
  • Activated carbon
  • Mechanochemical activation
  • Photo-Fenton reaction
  • Wastewaters purification