Three-dimensional plasmonic Ag-AgCl/γ-TaON composites have been successfully synthesized by anchoring Ag-AgCl nanocrystals on the surfaces of monoclinic γ-TaON hollow urchin-like spheres via the deposition-precipitation method and photo-reduction process. The as-prepared samples were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, Brunauer-Emmett-Teller analysis, X-ray photoelectron spectra and UV-vis diffuse reflectance spectrum. The interleaved nanoneedles assembled in the hierarchical floriated γ-TaON hollow spheres contributed to the stable deposition of Ag/AgCl nanocrystals and the formation of effective nanojunctions. The effects of the amount of Ag-AgCl nanocrystals and the photo-reduction time upon the photocatalytic properties for the Ag-AgCl/γ-TaON composites were systematically investigated. Inspiringly, the hierarchical AgCl/Ag/γ-TaON hollow composite photocatalyst in the Z-scheme system has the superior photocatalytic performance than γ-TaON hollow spheres and conventional β-TaON nanocrystals over the degradation of rhodamine B and acid orange 7 dyes and the reduction of aqueous Cr(VI), which is attributed to the effective charge transfer from plasmon-excited Ag nanocrystal to TaON, leading to the low recombination rates of the photoinduced electron-hole pairs. X-ray photoelectron spectroscopy analyses indicated that both AgCl and Ag0 components coexist in the system, and the as-prepared composite is relatively stable. This work could provide new insights into the fabrication of hierarchically plasmonic photocatalysts with high performance and facilitate their practical application in environmental issues.
- Ag-AgCl nanocrystals
- TaON hollow spheres
ASJC Scopus subject areas
- Environmental Science(all)
- Process Chemistry and Technology