Effect of Ag+ reduction on the photocatalytic activity of Ag-doped TiO2. (September 2017)

• Record Type: Journal Article
• Authors: Elsellami, L.; Dappozze, F.; Houas, A.; Guillard, C.
• Is Part Of: Superlattices and microstructures. Volume 109(2017)
• Page Start: 511
• Page End: 518
• Publication Date: 2017-09
• Subjects: Ag-doped TiO2 -- Sol-gel method -- Ag+ reduction -- Photocatalytic activity; Superlattices as materials -- Periodicals; Microstructure -- Periodicals; Semiconductors -- Periodicals; Superréseaux -- Périodiques; Microstructure (Physique) -- Périodiques; Semiconducteurs -- Périodiques; 621.38152
• DOI: 10.1016/j.spmi.2017.05.043
• Languages: English
• ISSNs: 0749-6036

Abstract

Abstract: Ag-doped TiO2 nanomaterials (Ag–TiO2 ) were prepared with different percentages (1%, 2%, and 4%) by a sol–gel method. This mixture was subsequently calcined at 600 °C. The structures of Ag–TiO2 nanomaterials were characterized by X-ray diffraction (XRD), UV–vis diffuse reflectance spectra (DRS) and transmission electron microscope (TEM). The evaluation of the photocatalytic activity was carried out using formic acid (FA) as a model of chemical pollutants in UV conditions. The results showed that the Ag-doping at different percentages played an important role in the microstructure and photocatalytic activity of the samples. The Ag-doped TiO2 sample at (1%) showed a photocatalytic activity about three times higher than that of P25 under UV light irradiation. Both the photocatalysis and the improvement of adsorption brought about more efficiency (1%) of Ag-doped TiO2 due to the reduction of Ag + . Graphical abstract: Highlights: More important efficiency 1% of Ag/TiO2 compared to undoped TiO2 and P25. Good correlation between adsorption and disappearance of formic acid for TiO2 doped by Ag. Samples turn to grey-black after photocatalysis due to the reduction of Ag + . Improvement of charge separation: h + react with formic acid, electron reacts with Ag + .