Surfactant-free synthesis of hierarchical niobic acid microflowers assembled from ultrathin nanosheets with efficient photoactivities

Morphology‐Tuned Activity of Ru/Nb2O5 Catalysts for Ketone Reductive Amination

“…The morphologies of these three Ru/Nb 2 O 5 samples were observed by TEM images and found that 1 %Ru/Nb 2 O 5 −L has the rod‐shaped morphology (Figure a), the 1 %Ru/Nb 2 O 5 −H catalyst has spherical morphology, which may be accumulated by small Nb 2 O 5 nanoparticles (Figure b) and the 1 %Ru/Nb 2 O 5 −F shows a nanoslice‐like morphology and assembled to nanoflower‐like morphology when we observed in a large scale (under FE‐SEM), which is in line with the previous report (Figure S1) . However, it is hard to destinguish the Ru particles in TEM images, due to the extremely small Ru particle size, which is in agreement with XRD results.…”

“…After stirring for 4 h at 40 °C, the solution was transferred to a 100 mL Teflon‐lined autoclave, and heated at 180 °C for 24 h. The resulting precipitates were collected, filtered, washed with DI‐water several times, then dried at 60 °C for 24 h and calcined at 600 °C (2 °C ⋅ min −1 ) for 2 h in air. Flower‐like Nb 2 O 5 (labeled as Nb 2 O 5 −F) were also synthesized via a modified hydrothermal process according to literature . In a typical synthesis process, 0.4 g NbCl 5 was dissolved in 4 ml ethanol.…”

“…Flower-like Nb 2 O 5 (labeled as Nb 2 O 5 À F) were also synthesized via a modified hydrothermal process according to literature. [14] In a typical synthesis process, 0.4 g NbCl 5 was dissolved in 4 ml ethanol. Then, 17 ml deionized water and 3 ml ammonium hydroxide solution were added into the NbCl 5 ethanol solution under vigorous stirring, and the mixture was stirred for another 2 h at room temperature.…”

Facile synthesis of flower-like hierarchical N-doped Nb2O5/C nanostructures with efficient photocatalytic activity under visible light

“…With an increase in the irradiation time, the superior absorption peaks of RhB at 554 nm were signicantly diminished and shied to the minimum wavelength in the case of N-NBO/C. This result shows that the RhB solution was almost totally decomposed aer irradiation for 30 min, and the aromatic rings and chromophores of RhB were demolished by N-NBO/C under visible-light illumination 16,53 into aliphatic organic components and slightly mineralized to CO 2 and H 2 O. 2,54 The RhB photocatalytic degradation process ts pseudo-rstorder kinetics based on the linear transformation of ln(C 0 /C) ¼ kt, 55 where C 0 represents the concentration of RhB molecules aer the dark adsorption-desorption equilibrium, and C is the concentration at reaction time t. Fig.…”

A hierarchical Nb2O5@NiFe-MMO rod array, fabricated and used as a structured photocatalyst

“…10 Many researchers have focused on developing new low energy chemical manufacturing approaches, in which photocatalytic reactions is one of the promising method. 11,12 Among the most promising photocatalysts, niobium pentoxide (Nb 2 O 5 ) has excellent photochemical activity with the band gap of 390 nm (3.2 eV) that has been applied for the degradation of organic pollutant, [13][14][15] water splitting to produce hydrogen 16,17 and selective oxidation of benzylamine. 9 However, due to the high recombination rate of photogenerated electron-hole pairs, the photocatalytic activity of Nb 2 O 5 is rather limited.…”