Photodeposition of gold on titanium dioxide for photocatalytic phenol oxidation

A review on plasmonic metal⿿TiO2 composite for generation, trapping, storing and dynamic vectorial transfer of photogenerated electrons across the Schottky junction in a photocatalytic system

“…Compared to the photodeposition method, chemical reduction method by citrate molecules gave much homogeneous and smaller gold deposits with better dispersion which resulted in stronger bonding and superior electronic junction between gold nano particles and the TiO 2 surface. Au/TiO 2 prepared by photodeposition method using a low intensity light illumination (0.14 W/m 2 UVA range) showed notable improvement in photocatalytic activity for the phenol decomposition under UV light compared to Au/TiO 2 prepared by the same method using high intensity illumination (140 W/m 2 UVA range) [97]. The poor activity of the later sample was due to the production of very large and heterogeneously distributed gold deposits which serve as recombination centers rather than as the trap sites for photogenerated electrons ( Table 3).…”

“…The poor activity of the later sample was due to the production of very large and heterogeneously distributed gold deposits which serve as recombination centers rather than as the trap sites for photogenerated electrons ( Table 3). The extent of gold deposition, aggregation and oxidation state of Au can be controlled effectively by changing the deposition time for Au/TiO 2 (prepared at low intensity light illumination) [97]. Au deposited on Ti 3+ self doped TiO 2 effectively boosted the photocatalytic degradation of Rhodamine B (RhB) [98].…”

Simultaneous Production of CH4and H2from Photocatalytic Reforming of Glucose Aqueous Solution on Sulfated Pd-TiO2Catalysts

“…2.1 Photocatalyst Characterization 2.1.1 X-Ray Diffraction Figure 1 shows the XRD patterns of the Pd-TiO 2 photocatalysts; the only crystalline phase present in all the samples was anatase, identified by the main XRD peak located at 25.25°, thus indicating that the sulfation pre-treatment inhibited the formation of the rutile phase of TiO 2 during the calcination process, as has been reported by different authors [33][34][35][36].…”

“…The TiO 2 powder was recovered by filtration, dried at 110°C for 24 h and pre-treated by immersion in a 1M sulfuric acid solution under continuous stirring for 1 h. After pre-treatment, the solution was filtered, dried and calcinated at 650°C for 2 h; the resulting photocatalyst was used as starting material (S-TiO 2 ). The fresh TiO 2 powder was submitted to a sulfate treatment, taking into account that previous results have shown that sulfate pre-treatment stabilizes the anatase phase up to high temperatures and protects the surface area against sintering [33][34][35][36].…”

Methylene blue degradation over M-TiO2 photocatalysts (M= Au or Pt) / Degradación de azul de metileno sobre fotocatalizadores M-TiO2 (M = Au o Pt)

“…Afterward, the generated precipitate was filtered, dried at 110°C overnight and calcined at 650 °C for 2h. Sulfation treatment was applied to TiO 2 before calcination; the powders were sulfated by immersion in H 2 SO 4 aqueous solution 1 M for 1 h and afterward calcinated at 650 ºC for 2 h. Sulfation treatment was carried out for two reasons; on one hand, previous results have shown that sulfation stabilizes the anatase phase up to high temperatures and protect the catalyst from the loss of surface area by sintering [15][16][17]. On the other hand, at the calcination temperature of 650 ºC, the elimination of sulfate groups promotes the creation of high number of oxygen vacancies, which have been reported as preferential sites for noble metal adsorption [18].…”