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Chemical state and local structure of V species incorporated in δ-Bi2O3 photocatalysts

Sudrajat, Hanggara
Journal of materials science 2018 v.53 no.2 pp. 1088-1096
X-radiation, X-ray absorption spectroscopy, absorption, ambient temperature, beta-adrenergic antagonists, crystal structure, oxidation, photocatalysts, surface area
Herein, the delta phase bismuth oxide (δ-Bi₂O₃) with high crystallinity can be obtained at room temperature through a sol–gel route in the presence of VO₃ ⁻. The as-synthesized δ-Bi₂O₃ photocatalysts are characterized using synchrotron-based techniques, including ultraviolet photoelectron spectroscopy, X-ray absorption near edge structure, and extended X-ray absorption fine structure. Results show that V species plays a key role in stabilizing the δ phase of Bi₂O₃. With increasing V/Bi molar ratio, crystallinity, light absorption ability, and specific surface area increase. The V species predominantly exists in the +5 oxidation state, irrespective of V loading amount, and is tetrahedrally coordinated to four O atoms with a bond length of 1.716 Å. The δ-Bi₂O₃ photocatalysts show appreciable visible light activity for the decomposition of atenolol, an important β-blocker drug.