SrSnO3 perovskite obtained by the modified Pechini method—Insights about its photocatalytic activity

Supporting the photocatalysts on ZrO2: An effective way to enhance the photocatalytic activity of SrSnO3

“…Considering that only 7% of SrSnO3 was deposited on ZrO2, this remarkable improvement may be assigned to the interfacial coupling between SrSnO3 and ZrO2, as previously stated. Moreover, comparison with the previous publication of our research group [32], indicates that the lowest crystallinity of SrSnO3 after deposition does not seem to be responsible for its highest activity. In this previous paper, SrSnO3 was calcined at a lower temperature and a higher short-range disorder was attained as indicated by the broad bands in the infrared spectrum and in the Raman spectrum and also by the smallest band gap value.…”

“…Evaluation of the formation of hydroxyl radical was done by the photooxidation of terephthalic acid in accordance to the procedure described by Teixeira et al [32]. After photocatalytic tests, both materials showed a meaningful increase in the intensity of the luminescent band at 420 nm, as displayed in Figure 8.…”

“…This reaction produces 2-hydroxyterephthalic acid, a fluorescent substance [22,30,31]. The photocatalytic test was performed according to the procedure described by Teixeira et al [32]. The emission spectra were analyzed in a Hitachi F 2500 fluorescence spectrophotometer, with excitation wavelength at  = 320 nm and monitoring at  = 426 nm, which corresponds to the main fluorescence band of the 2-hydroxyterephthalic acid.…”

“…For the scavenger experiments, isopropyl alcohol (1.6 x 10 -1 mol L -1 ) was used as hydroxyl radical inhibitor, silver nitrate (5.0 x 10 -4 mol L -1 ) was used to capture photogenerated electrons and EDTA (2.0x 10 -4 mol L -1 ) to react with photogenerated holes [32,34,35]. Preliminary tests were carried out in order to determine the optimal amount of the scavengers used in the photocatalytic tests.…”

Theoretical-experimental evaluation of the photocatalytic activity of KCa2Ta3−xNbxO10

“…Reflectance Spectroscopy (DRS, Varian Cary 100 UV-Vis, 250-800 nm), Raman spectroscopy (Renishaw inVia Raman Microscope, 514 nm laser wavelength), SEM-EDXS (Jeol JSM 7100 F microscope, operating at 10 kV for Energy Dispersive X-ray Spectroscopy analyses (EDXS) using an Oxford Instruments AZtec system). Formation of hydroxyl radicals was evaluated by the photohydroxylation of terephthalic acid (TA), used as probe at room temperature [9], under conditions previously described in the literature [10]. A blank test was performed with TA solution irradiation without photocatalyst.…”