| Autor: |
Mukhlish, Muhammad Zobayer Bin, Islam, Md. Amirul, Rahman, Md Anisur, Hossain, Shafiul, Islam, Md. Akhtarul, Uddin, Md. Tamez |
| Zdroj: |
Desalination & Water Treatment; August 2021, Vol. 230 Issue: 1 p169-183, 15p |
| Abstrakt: |
In this study, CeO2/TiO2nanocomposites (NCs) were synthesized by adopting a straightforward two steps method comprising, first, the synthesis of CeO2and TiO2nanoparticles by wet chemical precipitation method and second, the heterostructure CeO2/TiO2NCs by solid-state reaction process. The CeO2/TiO2NCs were characterized by X-ray diffraction, N2adsorption–desorption isotherm analysis, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and UV-vis diffuse reflectance spectroscopy. Regardless of CeO2content, the bandgap energies of CeO2/TiO2NCs were lower than that of pure TiO2. Photocatalytic activity of the synthesized photocatalysts was assessed by degrading a model dye methylene blue under the illumination of UV light. The CeO2/TiO2NCs containing 2 wt% CeO2exhibited higher photocatalytic degradation efficiency compared to reference TiO2(P25), pure TiO2, and CeO2/TiO2NCs containing CeO2other than 2 wt%. The alkaline environment was favorable for photocatalytic decomposition of cationic dye methylene blue (MB). The enhanced degradation efficiency of CeO2/TiO2NCs was substantiated in terms of vectorial charge separation and the reduction of photogenerated charge carriers owing to the band offsets existing at the interface between CeO2and TiO2NPs. Finally, no significant change in the degradation efficiency of CeO2/TiO2NCs after successive uses evidenced the stability and reusability of the photocatalysts. Therefore, it can be concluded that the synthesized CeO2/TiO2heterostructure photocatalyst would be a promising candidate for application in wastewater treatment. |
| Databáze: |
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