Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 626, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2021.127049
Keywords
Bi2O3; Fluorination; Thermal shock; Photocatalysis; Nanopowder
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Funding
- Atilim University [ADP-1920-002]
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Fluorinated Bi2O3 nanopowder was prepared by fluorination and thermal shock of alpha-Bi2O3 nanopowder, leading to changes in crystal structure, optical properties, and photocatalytic efficiency. The substitution of O2- with F- was confirmed, altering Bi atom coordination and band structure, resulting in improved charge carrier mobility and enhanced photocatalytic performance upon F insertion. Thermal shock from different temperatures influenced the photocatalytic activity of F-Bi2O3 nanopowder, with the best performance observed after 180 min of irradiation at 500 degrees C.
Fluorinated Bi2O3 (F-Bi2O3) nanopowder was prepared via fluorination followed by thermal shock of alpha-Bi2O3 nanopowder. The XRD, FTIR, SEM, and DRS characterization techniques were employed to investigate the effects of fluorine (F) insertion into the alpha-Bi2O3 host and the thermal shock from different temperatures. The crystal structure, optical and photocatalytic properties of the F-Bi2O3 nanopowders prepared were researched. The XRD results confirmed the substitution of O2- with F-. The FTIR results revealed that the coordination of Bi atoms changed upon F- substitution. The incorporation of F into the alpha-Bi2O3 host and thermal shock did not influence the morphology but modified the band structure of alpha-Bi2O3, leading to a red-shift in the optical absorption edge. Also, the bandgap narrowed from 2.8 eV to 2.6 eV. The density functional theory calculation proved that the F 2p orbitals were positioned in the valence band (VB), resulting in broader and more spread bands for F-Bi2O3. The results suggested that the photoexcited charge carrier mobility in the valence band (VB) and conduction band (CB) are enhanced upon F insertion into alpha-Bi2O3. The photocatalytic efficiency of the synthesized nanopowders was assessed by the degradation of Bromocresol Green (BG) under visible light illumination. Photocatalytic activity improved upon fluorination. The F-Bi2O3 nanopowders thermally shocked from higher temperatures showed negligible photocatalytic performance. The best photocatalytic performance of 70% BG degradation was realized after 180 min visible irradiation for the F-Bi2O3 nanopowder thermal shocked from 500 degrees C.
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