Preparation of plasmonic porous Au@AgVO₃ belt-like nanocomposites with enhanced visible light photocatalytic activity

Abstract

This study reports a visible light-driven plasmonic photocatalyst of Au deposited AgVO nanocomposites prepared by a hydrothermal method, and further in situ modification of Au nanoparticles by a reducing agent of NaHSO in an aqueous solution at room temperature. Various characterization techniques, such as SEM, TEM, XRD, EDS, XPS, and Brunauer-Emmett-Teller, were used to reveal the morphology, composition, and related properties. The results show that belt-like AgVO nanoparticles with a width of ∼100 nm were successfully synthesized, and Au nanoparticles with controlled sizes (5-20 nm) were well distributed on the surface of the nanobelts. The UV-vis absorption spectra indicate that the decoration of Au nanoparticles can modulate the optical properties of the nanocomposites, namely, red shift occurs with the increase of Au content. The photocatalytic activities were measured by monitoring the degradation of Rhodamine B (RhB) with the presence of photocatalysts under visible light irradiation. The photodegradation results show that AgVO nanobelts exhibit good visible light photocatalytic activities with a degradation efficiency of 98% in 50 min and a reaction rate constant of 0.025 min towards 30 ppm RhB. With the modification of Au nanoparticles, photocatalytic activity basically increases with the molar ratio of Au to V. Among the Au@AgVO nanocomposites, the 3% (molar ratio) Au decorated AgVO nanobelts showed the highest photocatalytic activity, and the k (0.064 min) was almost two times higher than that of the pure AgVO nanobelts. This can be attributed to several factors including specific surface areas, optical properties, and the energy band structure of the composites under visible light illumination. These findings may be useful for the practical use of visible light-driven photocatalysts with enhanced photocatalytic efficiencies for environmental remediation.

Superior Hydrogen Sensing Property of Porous NiO/SnO2 Nanofibers Synthesized via Carbonization

“…As presented in Figure 5a, the total spectrum of NiSn/4 sample surface mainly contains the elements of Sn, Ni, and O. The present of C peak with binging energy of 284.8 eV was introduced by the instrument itself for peak correction [41]. Figure 5b shows two peaks of Sn 3d 5/2 (486.8 eV) and Sn 3d 3/2 (495.2 eV) with binding energy difference of 8.4 eV, suggesting a normal chemical state of Sn 4+ in the sample [42].…”

Experimental and theoretical investigation on the ORR activity of AgVO3

“…The peaks located at 529.9 eV (O I ) and 530.9 eV (O II ) correspond to the O 2À ions in AgVO 3 from the M-O bond component and oxygen ions in oxygen-deficient regions arising from the oxygen vacancies, respectively. [44][45][46] The peak at 532.6 eV (O III ) is attributed to the adsorbed water component. 47 The ratio of peak area (O II /O I + O II ) indicates the relative quantity of oxygen vacancies, 44,48 which is found to be 58.12%.…”

Self‐Assembled Monolayer Stabilized Gold‐Vanadate Nanoflute for Water Splitting Reactions

“…and can be applied for different other applications. Although the various nanostructures of VOx doped with other metal ions are known in literature but the same integrated with Au or Au 2 S having hollow cylindrical nanoflute structure is not known so far. The current study thus reports for a new material of gold‐vanadate with good redox behaviour and finding application in OER, HER and NAR.…”

“…Apart from SAM stabilized Au NPs, VOx are also known as promising semiconducting materials for its suitable band gap . VOx also serves as good inorganic support for different metals like Bi and Ag making them to be highly effective photocatalyst and also finding application in Li‐ batteries and OER as well HER . Another advantage of VOx is that its morphology can be tuned to various nano forms like nanorods, nanobelts, nanospheres and nanoribbons etc.…”