Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 806, Issue -, Pages 1368-1376Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.07.272
Keywords
MoO3; Annealing temperature; Defects; Photocatalytic; Phase transition
Categories
Funding
- MNNIT Allahabad
- SERB, India [PDF/2017/000900]
- Prayagraj
- TEQIP-III
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Rod shaped structures of molybdenum trioxide (MoO3) were synthesized at low temperature using simple and low cost method. The synthesized materials were characterized by different characterization techniques. The effect of annealing temperature on crystal structure and optical properties of MoO3 was investigated. The hexagonal phase (h-MoO3) was observed up to 300 degrees C and beyond this temperature, the phase of the MoO3 is changed to orthorhombic (alpha-MoO3). The transition of crystal phase (h-MoO3 to alpha-MoO3) was investigated by analyzing the X-ray diffraction (XRD), Raman and DSC measurements. The shift in the wavenumber position of 971 cm(-1) (Mo-O stretching) peak with temperature also substantiates the phase transition in MoO3 structure. The shape of nanostructured MoO3 was modified with annealing temperature. The change in crystal phases and shapes with temperature may result defects in the structure, which essentially modify the structural and optical properties of the material. The photocatalytic properties of the synthesized materials were studied on methylene blue (MB) dye under UV-irradiation. The sample annealed at 400 degrees C (M4) show excellent photodegradation compared to other samples. It could be due to the combined effects of shape (helical) and defects (oxygen vacancies) present in M4, as supported by the electron paramagnetic resonance (EPR) measurements. Among the various radicals, OH center dot plays an important role in photodegardation of the MB dye. (C) 2019 Elsevier B.V. All rights reserved.
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