Results 1 - 1 of 1
Results 1 - 1 of 1. Search took: 0.014 seconds
[en] Silver-containing niobate AgNb7O18 nanoparticles were prepared via sol-gel polymerized complex synthesis. The sample was given a good XRD Rietveld refinement in a typical perovskite-like structure. The detailed surface properties of AgNb7O18 nanoparticles were tested by SEM, EDS, TEM, nitrogen adsorption-desorption isotherms and XPS measurements. AgNb7O18 is characterized via a direct transition and the band energy is 2.76 eV. The hybridization between O 2p and Ag 3d states in valence band contributes to the narrowed band gap. The first principles electronic structure elucidation supports the narrow band gap of AgNb7O18. The sample shows an efficient degradation of methylene blue dye (MB) solutions. The trapping tests were performed to elucidate the real active species in the photocatalytic reactions. The results indicate that the superoxide radical is the main active species in the photocatalytic system, and the photocatalyst also shows a good stability and durability. - Highlights: • A new semiconductor nanoparticle AgNb7O18 was prepared. • The silver niobate has a typical perovskite-like structure. • AgNb7O18 shows an efficient absorption with a narrow gap 2.76 eV. • AgNb7O18 has an efficient photocatalytic activity on MB photo-degradation. • The photocatalysis mechanism and stabilities were discussed.