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Room Temperature Synthesis of V-Doped TiO(2) and Its Photocatalytic Activity in the Removal of Caffeine under UV Irradiation

In this work, the influence of simple acids in the room temperature sol-gel synthesis of TiO(2) was investigated and the efficiency of prepared photocatalysts was evaluated in the removal of caffeine. To improve the photoactivity of TiO(2), vanadium-doped TiO(2) (VTiO(2)) samples were obtained start...

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Detalles Bibliográficos
Autores principales: Sacco, Olga, Sannino, Diana, Matarangolo, Mariantonietta, Vaiano, Vincenzo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6472005/
https://www.ncbi.nlm.nih.gov/pubmed/30893877
http://dx.doi.org/10.3390/ma12060911
Descripción
Sumario:In this work, the influence of simple acids in the room temperature sol-gel synthesis of TiO(2) was investigated and the efficiency of prepared photocatalysts was evaluated in the removal of caffeine. To improve the photoactivity of TiO(2), vanadium-doped TiO(2) (VTiO(2)) samples were obtained starting from different amount of vanadyl sulphate as a dopant source. The samples were centrifuged, washed and finally dried at room temperature, and no calcination step was carried out. The prepared photocatalysts were characterized by different techniques (X-ray powder diffraction (XRD), specific surface area (SSA), ultraviolet-visible diffuse reflectance spectra (UV-vis DRS) and Raman). VTiO(2) photocatalysts were tested in the photocatalytic removal of aqueous solutions containing caffeine. The photocatalytic tests were carried out in a recirculating batch cylindrical photoreactor irradiated by a UV LEDs strip (nominal power of 12 W and wavelength emission peak at about 365 nm) surrounding the external surface of the reactor. The optimized VTiO(2) photocatalyst was able to reach a caffeine degradation of about 96% after 360 min of UV light irradiation with a total organic carbon (TOC) removal of 72%.