The influence of Al doping on the photocatalytic activity of nanostructured ZnO: The role of adsorbed water
| Autor: | Ammar Houas, Bartolomeo Megna, Hinda Lachheb, Leonardo Palmisano, Abdessalem Hamrouni, Francesco Parrino, F. Ajala |
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| Přispěvatelé: | Ajala, Faten, Hamrouni, Abdessalem, Houas, Ammar, Lachheb, Hinda, Megna, Bartolomeo, Palmisano, Leonardo, Parrino, Francesco |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Diffuse reflectance infrared fourier transform Band gap Adsorbed water Al-doped ZnO Defects Nanoparticles Photocatalysis Sol-gel ZnO Surfaces Coatings and Films Settore AGR/13 - Chimica Agraria General Physics and Astronomy 02 engineering and technology 010402 general chemistry 01 natural sciences symbols.namesake Nanoparticle Photocatalysi Adsorption Specific surface area Fourier transform infrared spectroscopy Doping Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films Settore ING-IND/22 - Scienza E Tecnologia Dei Materiali Chemical engineering symbols Defect 0210 nano-technology Raman spectroscopy |
| Zdroj: | Applied Surface Science. 445:376-382 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2018.03.141 |
| Popis: | Al doped ZnO nanoparticles (labeled as x% A-ZnO, x = 0.0, 0.5, 1.0, and 1.5) were synthesized by a simple sol-gel method, characterized and tested as photocatalysts for the degradation of a model compound under UV-light irradiation. Diffuse reflectance spectroscopy (DRS) and photoelectrochemical analysis have been performed to evidence their optical and electronic behavior. The structural features of the powders were highlighted by means of specific surface area (SSA) analysis, X-ray diffraction (XRD), Fourier-transform infrared (FTIR) and Raman spectroscopy. Al doping results in enhanced photocatalytic activity of the modified powders with respect to pure ZnO. In particular, the highest activity was achieved with the 1.0% A-ZnO sample. The presence of Al did not significantly change neither the optical absorption nor the electronic structure of the powders. In fact, the observed blue shift of the band gap and cathodic shift of the quasi Fermi level of the modified powders occurred only at a virtually negligible extent. On the other hand, the structural analysis evidenced that the enhanced photocatalytic activity may be ascribed to the important surface defectivity induced mainly by substitution of Zn2+ by Al3+ ions and to the deriving higher hydrophilicity of the Al doped samples. |
| Databáze: | OpenAIRE |
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