Synthesis of V⁵⁺‐doped Ag/AgCl photocatalysts with enhanced visible light photocatalytic activity

Abstract

V 5+ -doped Ag/AgCl photocatalysts were prepared via the ion exchange method. The catalysts were characterized using X-ray diffractometry, transmission electron microscopy, and energy-dispersive X-ray, X-ray photoelectron, Fourier transform infrared and ultraviolet-visible spectroscopies. The V 5+doped Ag/AgCl photocatalysts show much higher photocatalytic activities than Ag/AgCl under visible light irradiation for methyl orange (MO) decomposition.Especially, the 2.0 wt% V 5+ -doped Ag/AgCl photocatalyst shows the highest photocatalytic activity and also high stability after five cycles. The MO degradation rate during each cycle is almost maintained at 97%. Electron spin resonance spectroscopy and radical trapping experiments reveal that holes play an important role in the photocatalytic process. KEYWORDS enhanced mechanism, photocatalyst, V 5+ -doped Ag/AgCl

Photocorrosion Inhibition of Semiconductor-Based Photocatalysts: Basic Principle, Current Development, and Future Perspective

“…In another work, Song and co-workers successfully doped Ag/AgCl with V 5+ ion (V–Ag/AgCl) for decomposition of MO under simulated solar light illumination . The V–Ag/AgCl photocatalyst exhibits higher photocatalytic activity and stability than bare Ag/AgCl.…”

“…In another work, Song and co-workers successfully doped Ag/AgCl with V 5+ ion (V−Ag/AgCl) for decomposition of MO under simulated solar light illumination. 138 The V−Ag/ AgCl photocatalyst exhibits higher photocatalytic activity and stability than bare Ag/AgCl. Especially, the results of MO degradation cycle experiments suggested that the activity of the optimized V−Ag/AgCl sample is maintained at 97% for five cycles, confirming the effective photocorrosion inhibition of V−Ag/AgCl.…”

Preparation and photocatalytic activity of carbon dot/Ag/AgCl

“…[5,[15][16][17] In particular, nano-Ag/Ag halide particles can flexibly change the range of visible light absorption by changing the morphology or reaction conditions, or can be modified by doping a promoter. [18][19][20][21][22][23][24] For instance, the compounding with graphene can accelerate the photoelectron-hole separation and enlarge specific surface area, thus largely improving the photocatalytic performance of Ag/Ag halide photocatalysts. Huang et al synthesized Ag/AgCl/TiO 2 /graphene and Ag/Ag 2 O/TiO 2 /graphene heterojunction compound photocatalysts from photoreduction and hydrothermal methods, characterized their structures and performances, and identified the optimal preparation condition by adjusting pH in the solutions.…”

“…These photocatalysts integrate the SPR of noble metals and the advantages of compound semiconductor photocatalysts . In particular, nano‐Ag/Ag halide particles can flexibly change the range of visible light absorption by changing the morphology or reaction conditions, or can be modified by doping a promoter . For instance, the compounding with graphene can accelerate the photoelectron‐hole separation and enlarge specific surface area, thus largely improving the photocatalytic performance of Ag/Ag halide photocatalysts.…”