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- W2901307002 abstract "The scheelite BaWO4 elaborated by co-precipitation, is a wide band gap semiconductor crystallizing in the tetragonal symmetry. The oxide is identified by X-ray diffraction and characterized by scanning electron microscopy and diffuse reflectance. The optical transition (2.95 eV) involves O2-: 2p orbital and W6+ eg: level, further direct transition occurs at 4.88 eV. The peaks in the Raman spectrum are assigned to symmetrical vibrations of tetragonal units [WO4]2-. The oxide shows an oxygen deficiency and the conductivity follows a thermally activated hopping of lattice polaron with activation energy of 0.31 eV. The photo electrochemical analysis of BaWO4 at pH 5.5 gives a flat band potential of 0.20 VSCE and electrons density of 1.8 × 1019 cm−3. The positive slope of the plot (capacitance−2 - potential) indicates n type conduction, a result confirmed by chrono-amperometry. The frequency dispersion of the real/imaginary impedances is undertaken both in the dark and under illumination; the response is modeled by an equivalent circuit with a predominant bulk contribution. As application, the photo electrons in the conduction band (−0.11 VSCE) reduce oxygen into radicals O2•-, allowing a partial mineralization of ibuprofen, one of the most consumed medicaments. The electro-photocatalysis i.e. combined electrocatalysis/electro-photocatalysis using TiPt as cathode and BaWO4 as anode (100 mA/25 V) shows a high conversion yield (75%), in aerated ibuprofen solution (20 ppm) in less than 6 h under UV light (12 mW cm−2). The reaction follows a pseudo-first order kinetic with a rate constant of 3.7 × 10−3 min−1, about twice higher than that obtained by electrocatalysis (50%, k = 1.9 × 10−3 min−1)." @default.
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- W2901307002 date "2019-03-01" @default.
- W2901307002 modified "2023-10-16" @default.
- W2901307002 title "Electrochemical properties of the scheelite BaWO4 prepared by co-precipitation: Application to electro-photocatalysis of ibuprofen degradation" @default.
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- W2901307002 doi "https://doi.org/10.1016/j.mssp.2018.11.017" @default.
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