Enhancement of photocatalytic degradation of MB by recyclable Li/Mn3O4 thin films
| Autor: | F. Saadallah, N. Mahdhi, Mosbah Amlouk, M.A. Amara, T. Larbi |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Scanning electron microscope Analytical chemistry Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Dielectric spectroscopy symbols.namesake chemistry.chemical_compound chemistry 0103 physical sciences symbols Photocatalysis Electrical measurements Electrical and Electronic Engineering Thin film Raman spectroscopy Hausmannite Visible spectrum |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 32:10963-10976 |
| ISSN: | 1573-482X 0957-4522 |
| DOI: | 10.1007/s10854-021-05756-2 |
| Popis: | Thin films of physical--mixture of Hausmannite Mn3O4 and lithium (Li) are synthesized by spray pyrolysis technique. Structural, morphological, optical, electrical, wettability and photocatalytic properties have been investigated. X-ray diffraction (XRD) and Raman spectra, Scanning electron microscope (SEM) images and electrical measurements show that Li nanoparticles are formed both on top surface of the film and inside grain boundaries. Bandgap and Urbach energies and optical relaxation time have been determined from transmittance T and reflectance R spectra. Impedance spectroscopy shows that charge separation increases with Li content, which improves photocatalytic efficiency of the film. The best photocatalytic efficiency is obtained for Li/Mn ratio of 15%. Indeed, the degradation of methylene blue (MB) under ultraviolet (UV) and visible light exposure, is improved by a factor of 5.7 and 2.4 respectively, when compared to undoped Mn3O4. In addition, this film exhibits a high photostability (10 cycles consecutively) under solar light. On the other hand, hydrophobicity reveals the hydrophilic character of the films. |
| Databáze: | OpenAIRE |
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