Temperature-induced phase changes in bismuth oxides and efficient photodegradation of phenol and p -chlorophenol

Photocatalytic activity of Ag/Al2O3–Gd2O3photocatalysts prepared by the sol–gel method in the degradation of 4-chlorophenol

“…The photo-catalytic method is based on the use of semiconductor materials as photocatalysts and UV or visible light as irradiation source. Among the photocatalytic materials, TiO 2 , [4][5][6] Bi 2 O 4 and Bi 2 O 7 , 7 and layered double hydroxides 8,9 have been tested for the photodegradation of phenolic compounds in aqueous medium. Alternative, it has been demonstrated in earlier work that in spite that g-Al 2 O 3 is considered as an isolating material, it exhibits high photocatalytic activity in the degradation of contaminant organic molecules in aqueous medium.…”

Complementary SEM-AFM of Swelling Bi-Fe-O Film on HOPG Substrate

“…Even after 39.5 h of etching, the characteristic Fe 3+ peak could be observed at the 719 eV and 720 eV satellite peaks. The surface before profiling is converted by Bi 3+ and shows the XPS peaks of Bi 4f7/2 and Bi 4f5/2 at 158.9 eV and 164.3 eV [33]. The shift in the binding energy to lower energies for the Bi4f spectra is connected with the presence of defects and amorphization of bismuth closer to the HOPG substrate (Figure 4b).…”

Innovative multifunctional hybrid photoelectrode design based on a ternary heterojunction with super-enhanced efficiency for artificial photosynthesis

“…However, for a conversion of ~ 100% of Bi 46 V 8 O 89 , as described in the previous reaction, the crystallization process would have to be necessarily performed at higher temperatures (≥ 700 °C) 26 ; nevertheless, as the correction was carried out under a basic pH condition, according to the reactions (b) and (c), and the crystallization of the BVO film was performed at 450 °C, it was already expected that other crystalline phases would be formed during the thermal decomposition 26,27 . Furthermore, it is known that corner sharing BiO − 3 e VO − 3 ions could give rise to mixed oxides [38][39][40] (Bi 3.33 (VO 4 ) 2 O 2 and Bi 4 O 7 ) by the action of hydroxyl radicals from the NH 4 OH base used in the synthesis process, as can be seen by the following reactions (b) and (c):…”

“…For the same reason (the ions coexistence), and with Bi 4 O 7 acting as a photosensitizer, singlet oxygen is formed after excitation by a triplet-triplet energy transfer step. This this kind of electrophilic oxygen plays also an important role in increasing the efficiency in the photoelectrochemical oxidation process, leading to an improvement in the HC-STH efficiency for energy conversion 38,57 . www.nature.com/scientificreports/ Further insights into the feature of electrical transport process across the photoelectrode can be theoretically also obtained via electrochemical impedance spectroscopy (EIS).…”