Effect of pH in the hydrothermal preparation of Bi2WO6 nanostructures

Teodóra Nagyné-Kovács, Gubakhanim Shahnazarova, István Endre Lukács, Anna Szabó, K. Hernádi, Tamás Igricz, K. László, Imre M. Szilágyi, G. Pokol

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In this study, Bi2WO6 was prepared by the hydrothermal method. The effects of reaction temperature (150/170/200 °C) and reaction time (6/12/24 h) were investigated. The role of strongly acidic pH (1 >) and the full range between 0.3 and 13.5 were studied first. Every sample was studied by XRD and SEM; furthermore, the Bi2WO6 samples prepared at different temperatures were examined in detail by EDX and TEM, as well as FT-IR, Raman and UV-vis spectroscopies. It was found that changing the temperature and time slightly influenced the crystallinity and morphology of the products. The most crystallized product formed at 200 °C, 24 h. The pure, sheet-like Bi2WO6, prepared at 200 °C, 24 h, and 0.3 pH, gradually transformed into a mixture of Bi2WO6 and Bi3.84W0.16O6.24 with increasing pH. The nanosheets turned into a morphology of mixed shapes in the acidic range (fibers, sheets, irregular forms), and became homogenous cube- and octahedral-like shapes in the alkaline range. Their band gaps were calculated and were found to vary between 2.66 and 2.59 eV as the temperature increased. The specific surface area measurements revealed that reducing the temperature favors the formation of a larger surface area (35.8/26/21.6 m2/g belonging to 150/170/200 °C, respectively).

Original languageEnglish
Article number1728
JournalMaterials
Volume12
Issue number11
DOIs
Publication statusPublished - Jun 1 2019

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Nanostructures
Temperature
Nanosheets
Ultraviolet spectroscopy
Specific surface area
Energy dispersive spectroscopy
Energy gap
Transmission electron microscopy
Scanning electron microscopy
Fibers

Keywords

  • BiWO
  • Full pH range
  • Hydrothermal synthesis
  • Morphology
  • Nanostructures

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Nagyné-Kovács, T., Shahnazarova, G., Lukács, I. E., Szabó, A., Hernádi, K., Igricz, T., ... Pokol, G. (2019). Effect of pH in the hydrothermal preparation of Bi2WO6 nanostructures. Materials, 12(11), [1728]. https://doi.org/10.3390/ma12111728

Effect of pH in the hydrothermal preparation of Bi2WO6 nanostructures. / Nagyné-Kovács, Teodóra; Shahnazarova, Gubakhanim; Lukács, István Endre; Szabó, Anna; Hernádi, K.; Igricz, Tamás; László, K.; Szilágyi, Imre M.; Pokol, G.

In: Materials, Vol. 12, No. 11, 1728, 01.06.2019.

Research output: Contribution to journalArticle

Nagyné-Kovács, T, Shahnazarova, G, Lukács, IE, Szabó, A, Hernádi, K, Igricz, T, László, K, Szilágyi, IM & Pokol, G 2019, 'Effect of pH in the hydrothermal preparation of Bi2WO6 nanostructures', Materials, vol. 12, no. 11, 1728. https://doi.org/10.3390/ma12111728
Nagyné-Kovács T, Shahnazarova G, Lukács IE, Szabó A, Hernádi K, Igricz T et al. Effect of pH in the hydrothermal preparation of Bi2WO6 nanostructures. Materials. 2019 Jun 1;12(11). 1728. https://doi.org/10.3390/ma12111728
Nagyné-Kovács, Teodóra ; Shahnazarova, Gubakhanim ; Lukács, István Endre ; Szabó, Anna ; Hernádi, K. ; Igricz, Tamás ; László, K. ; Szilágyi, Imre M. ; Pokol, G. / Effect of pH in the hydrothermal preparation of Bi2WO6 nanostructures. In: Materials. 2019 ; Vol. 12, No. 11.
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