Photoelectrochemical investigations in lead-free Ba (Ti^sub 0.950^Sc^sub 0.025^Nb^sub 0.025^)O^sub 3^ ferroelectric ceramics. Application to amoxicillin photodegradation

The composition Ba(Ti0.950Sc0.025Nb0.025)O3 (BTSN) belongs to the (1 − x)BaTiO3–xBaSc1/2Nb1/2O3 system (x = 0.05). The room temperature X-ray diffraction (XRD) analysis refined by the Rietveld method shows a tetragonal perovskite structure. The dielectric study, carried out on the ceramics in the ra...

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Bibliographic Details
Published in:Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 2018-05, Vol.358, p.294
Main Authors: Haddadou, N, Bensemma, N, Rekhila, G, Trari, M, Taïbi, K
Format: Article
Language:English
Subjects:
Amoxicillin
Antibiotics
Barium titanates
Ceramics
Curie temperature
Curie-Weiss law
Ferroelectric materials
Ferroelectricity
Ferroelectrics
Intermetallic compounds
Lead free
Optical properties
Oxidation
Perovskite structure
Perovskites
Phase transitions
Photocatalysis
Photodegradation
Photooxidation
Pollutants
Rietveld method
Space charge
Temperature effects
Water pollution
X-ray diffraction
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Summary:The composition Ba(Ti0.950Sc0.025Nb0.025)O3 (BTSN) belongs to the (1 − x)BaTiO3–xBaSc1/2Nb1/2O3 system (x = 0.05). The room temperature X-ray diffraction (XRD) analysis refined by the Rietveld method shows a tetragonal perovskite structure. The dielectric study, carried out on the ceramics in the ranges (77–500 K) and (102–2 × 105 Hz), exhibits a normal ferroelectric behavior. The ferroelectric-paraelectric phase transition appears at the Curie temperature (TC) of 338 K with a wide space charge region. The maximal dielectric permittivity (εr) is characterized by a broader peak than that observed in BaTiO3 at the temperature Tc. The slight deviation from the Curie-Weiss law is typical of ferroelectric materials with a diffuse phase transition. The polarization-electric field (P-E) loop of BTSN is in good agreement with the XRD analysis. The BTSN ferroelectric ceramic exhibits interesting photoelectrochemical properties with an optical gap of 2.60 eV and a flat band potential of −0.58 VSCE. We successfully tested the photocatalytic oxidation of amoxicillin, a pharmaceutical antibiotic currently released in water as pollutant on BTSN. The oxidation follows a first order kinetic with a half-life of 123 min under solar light and a conversion yield of 72%.
ISSN:1010-6030
1873-2666