Sunlight-driven photocatalytic degradation of 4-nitrophenol and adsorptive removal of Mn (II) ions from industrial wastewater by biogenic synthesized CuO/SnO2 heterojunction

First-Principles Calculations to Investigate Coupling Fe Doping with Oxygen Vacancies in Stannic Oxide and Their Physical Properties

“…At x = 0.7, the optical characteristics are delineated by a strong crystal field that splits the t 2g and e g bands (∼3.51 eV for Sn 0.3 Fe 0.7 O 2 ), which neutralize Hund’s rule and stabilizes the low spin configuration for the six 3d electrons that possess the sub-shell t 2g (Figure e). This Sn 0.3 Fe 0.7 O 2 oxide has both magneto-optical properties and anomalous Hall effect (AHE) properties. − At a higher fixation of x = 0.9, a short-range charge transfer Fe 2+ ↔ Fe 3+ + e – occurs due to spin–orbit splitting in the Fe-2p region (Figure f). This indicates the presence of Fe 3+ ions, a major difference in the oxidation state of Sn ions from Sn 4+ to Sn 2+ due to the change in Fe.…”

Construction of honey bee hive-like CuO/PbO heterojunction photocatalysts with enhanced antibiotic and dye degradation activity under visible light

“…19 CuO NPs showed peaks at 480, 602 and 634 cm −1 , which correspond to the interatomic vibrations between copper and oxygen, confirming the successful formation of the Cu-O bond. 20,21 Due to the asymmetric stretching of the hydroxyl bond, a sharp peak was seen at 3493 cm −1 and another peak at 1067 cm −1 was ascribed to the C-H bond stretching. 22 Upon synthesis of the CuO/PbO heterojunction, similar peaks were observed in all composites with an additional broad band appearing at 2500-2600 cm −1 and 1426 cm −1 , which may be due to the additional stretching vibrations originating between them.…”

Visible light photocatalytic NOx removal with suppressed poisonous NO2 byproduct generation over simply synthesized triangular silver nanoparticles coupled with tin dioxide

“…[12][13][14][15][16][17][18][19][20][21][22] As an n-type metal oxide semiconductor, SnO 2 has been extensively applied in photoelectrochemistry because of its advantages, such as high stability, non-toxicity, and cost-effectiveness. However, the use of SnO 2 as a single catalyst is not efficient enough due to the large bandgap and rapid charge recombination; 23 accordingly, many modication strategies such as doping, 24,25 morphology control, 26,27 and incorporation of a co-catalyst 28,29 have been devoted to further enhance the photocatalytic efficiency. Among these approaches, coupling with a plasmonic co-catalyst, typically silver (Ag), is benecial for not only expanding the light absorption range but also enhancing photogenerated charge separation.…”