1. Solar photodegradation of Rhodamine B dye by Cu2O/TiO2 heterostructure: experimental and computational studies of degradation and toxicity.
- Author
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Messaadia, L., Kiamouche, S., Lahmar, H., Masmoudi, R., Boulahbel, H., Trari, M., and Benamira, M.
- Subjects
RHODAMINE B ,FRONTIER orbitals ,MOLECULAR dynamics ,DENSITY functional theory ,PHOTODEGRADATION ,BAND gaps ,ELECTRONEGATIVITY - Abstract
Context and results: In this study, the heterojunction Cu
2 O/TiO2 is used for the degradation of a cationic dye, Rhodamine B, under solar light irradiation over a wide pH range. The physical and optical properties of both semiconductors Cu2 O and TiO2 are correlated with the photo-electrochemical characterization to establish the energy diagram of the heterojunction Cu2 O/TiO2 . X-ray diffraction, UV–visible, SEM, EDX, and BET analyses are conducted for both photocatalysts. The band gap (Eg ) of 3.26 eV is obtained for TiO2 with an indirect optical transition. In the case of Cu2 O, the transition is directly allowed at 2.05 eV. According to the BET analysis, the specific surface area of TiO2 particles is higher (82.65 m2 g−1 ) than that of Cu2 O (29.81 m2 g−1 ). The flat band potentials, determined from the Mott-Schottky plots, are 0.3 and − 0.32 VSCE for TiO2 and Cu2 O, respectively. The photocatalytic activity is directly proportional to the mass ratio, and the best result is obtained for the mass ratio 1:1 of Cu2 O/TiO2 . Computational and theoretical techniques: Furthermore, a theoretical study is conducted by using density functional theory to optimize the structure, reactivity sites of the RhB molecule, and physical parameters like the energy of the frontier molecular orbitals and electronegativity and to predict the proposed mechanism of RhB degradation as well as its intermediates. Also, molecular dynamics simulation is used to determine the adsorption behavior of RhB on TiO2 (101) and Cu2 O (111) surfaces. The ecotoxicity evaluation showed that degradation products have significantly lower acute toxicity than RhB. [ABSTRACT FROM AUTHOR]- Published
- 2023
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