Cobalt Impregnation on Titania Photocatalysts Enhances Vis Phenol Photodegradation
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http://hdl.handle.net/2183/33939
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Cobalt Impregnation on Titania Photocatalysts Enhances Vis Phenol PhotodegradationAutor(es)
Data
2023-06-01Cita bibliográfica
Belekbir, S.; El Azzouzi, M.; Rodríguez-Lorenzo, L.; El Hamidi, A.; Santaballa, J.A.; Canle, M. Cobalt Impregnation on Titania Photocatalysts Enhances Vis Phenol Photodegradation. Materials 2023, 16, 4134. https://doi.org/10.3390/ma16114134
Resumo
[Abstract] One of the main challenges of photocatalysis is to find a stable and effective photocatalyst, that is active and effective under sunlight. Here, we discuss the photocatalytic degradation of phenol as a model pollutant in aqueous solution using NUV-Vis (>366 nm) and UV (254 nm) in the presence of TiO2-P25 impregnated with different concentrations of Co (0.1%, 0.3%, 0.5%, and 1%). The modification of the surface of the photocatalyst was performed by wet impregnation, and the obtained solids were characterized using X-ray diffraction, XPS, SEM, EDS, TEM, N2 physisorption, Raman and UV-Vis DRS, which revealed the structural and morphological stability of the modified material. BET isotherms are type IV, with slit-shaped pores formed by nonrigid aggregate particles and no pore networks and a small H3 loop near the maximum relative pressure. The doped samples show increased crystallite sizes and a lower band gap, extending visible light harvesting. All prepared catalysts showed band gaps in the interval 2.3–2.5 eV. The photocatalytic degradation of aqueous phenol over TiO2-P25 and Co(X%)/TiO2 was monitored using UV-Vis spectrophotometry: Co(0.1%)/TiO2 being the most effective with NUV-Vis irradiation. TOC analysis showed ca. 96% TOC removal with NUV-Vis radiation, while only 23% removal under UV radiation.
Palabras chave
Photocatalysis
Phenol
Cobalt
Oxygen vacancies
UV-Vis radiation (366 nm)
UV (254 nm)
TiO2-P25
Wet impregnation
SERS
Phenol
Cobalt
Oxygen vacancies
UV-Vis radiation (366 nm)
UV (254 nm)
TiO2-P25
Wet impregnation
SERS
Descrición
This article belongs to the Special Issue Advanced Catalysts for Energy and Environmental Applications
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Atribución 4.0 Internacional
ISSN
1996-1944