Honeycombed iron doped graphitic carbon nitride with outstanding N 2 photofixation ability is synthesized in this work. Characterization results indicate that Fe 3+ inserts at the interstitial position and is stabilized in the electron-rich g-C 3 N 4 through the coordinative Fe-N bonds. Fe 3+ sites can chemisorb and activate N 2 molecules, then transfer the photogenerated electrons from the g-C 3 N 4 to adsorbed N 2 molecules. Fe0.05-CN displays the highest NH 4 + generation rate, which is approximately 13.5-fold higher than that of neat g-C 3 N 4 . Density functional theory simulations prove the N 2 activation effect of Fe 3+ sites due to the high adsorption energy and prolonged N N bond. Charge density difference result confirms the electrons transfer process from the Fe 3+ doping sites to N 2 molecule. DOS results indicate that the electrons of σ g 2p orbital (HOMO) in nitrogen atom is delocalized significantly when N 2 adsorbed on Fe 3+ doping sites, leading to its orbital energy almost connects to that of π g * 2p orbital (LUMO), which confirming that Fe 3+ doping sites can activate the N 2 molecule effectively. The Mulliken charge of nitrogen is −3.1 when the N 2 adsorbed on Fe 3+ doping sites, indicating that N 2 molecule is enriched by large number of electrons, which is beneficial to the H + attack to form NH 4 + .

Fe3+ doping promoted N2 photofixation ability of honeycombed graphitic carbon nitride: The experimental and density functional theory simulation analysis

Titania thin film system containing noble metallic nanoparticles such as Au, Ag, and Cu have been prepared by utilizing radio frequency reactive magnetron cosputtering method. The structural and morphological properties of the thin films were characterized by X-ray diffraction (XRD) and atomic force microscopy (AFM). Surface chemical composition of the films was determined by X-ray photoelectron spectroscopy (XPS). Optical properties of the TiO2 annealed films containing Au, Ag, and Cu metallic nanoparticles were investigated by UV−visible spectrophotometry showing surface plasmon resonance of the metals. The photocatalytic activity of all synthesized samples annealed at 600 °C in an Ar + H2(80 + 20%) environment was evaluated by measuring the rate of photodegradation reaction of methylene blue (MB) under similar conditions in the presence of UV and visible light irradiation. The Au:TiO2 and Cu:TiO2 thin film systems significantly enhanced photodecomposition of MB resulting in 80 and 90% of its initial co...

Photoenhanced Degradation of Methylene Blue on Cosputtered M:TiO2 (M = Au, Ag, Cu) Nanocomposite Systems: A Comparative Study

Mn-doped TiO2 nanopowders with remarkable visible light photocatalytic activity

The current work emphasizes the preparation, characterization, recyclability, stability, and mechanistic study of nanosized Fe3+-doped TiO2 photocatalyst. The structural, optical, and photocatalytic properties of undoped and doped TiO2 were studied by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), N2 absorption–desorption, UV–vis diffuse reflectance spectroscopy (DRS), photoluminescence (PL), electron spin resonance (ESR), X-ray photoelectron spectroscopy (XPS), Raman and UV–visible spectroscopy. XRD analysis showed that prepared powders with different iron content (200, 100, 50, and 25 molar ratios) consisted of only anatase phase. FTIR study confirmed the chelation of acetate with titanium precursor through the bidentate bridge mode; as a result, the condensation pathways are effectively altered by the acetate ligands favoring the formation of the anatase phase, this result gives further confirmation to the XRD analysis. A decrease in charge carrier recombination rate and the p...

Fe3+-doped Anatase TiO2 with d–d Transition, Oxygen Vacancies and Ti3+ Centers: Synthesis, Characterization, UV–vis Photocatalytic and Mechanistic Studies

https://northumbria-test.eprints-hosting.org/id/document/263576

Wensen He

Papers

Effect of Fe-doped TiO2 nanoparticle derived from modified hydrothermal process on the photocatalytic degradation performance on methylene blue.