Two Different Roles of Metallic Ag on Ag/AgX/BiOX (X = Cl, Br) Visible Light Photocatalysts: Surface Plasmon Resonance and Z-Scheme Bridge

Abstract

Ag/AgX/BiOX (X = Cl, Br) three-component visible-light-driven (VLD) photocatalysts were synthesized by a low-temperature chemical bath method and characterized by X-ray diffraction patterns, X-ray photoelectron spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy, and UV−vis diffuse reflectance spectra. The Ag/ AgX/BiOX composites showed enhanced VLD photocatalytic activity for the degradation of rhodamine B, which was much higher than Ag/AgX and BiOX. The photocatalytic mechanisms were analyzed by active species trapping and superoxide radical quantification experiments. It revealed that metallic Ag played a different role for Ag/AgX/BiOX VLD photocatalysts, surface plasmon resonance for Ag/AgCl/BiOCl, and the Z-scheme bridge for Ag/AgBr/BiOBr.

Photocatalytic properties of hierarchical BiOXs obtained via an ethanol-assisted solvothermal process

“…2 According to IUPAC, the N 2 adsorption-desorption isotherms of the BiOXs, with a hysteresis loop at P/P 0 > 0.6, are in accordance with type-IV isotherms (Fig. 3a), suggesting the presence of mesopores (Ye et al, 2012b). The pore size distribution curves are presented in Fig.…”

Regulations of silver halide nanostructure and composites on photocatalysis

“…During the overall dye degradation process of AgX, the normalized concentration of dye molecules (ln(C 0 /C)) show linear relationship with irradiation time indicating that these degradations follow the first-order kinetics (Eq. (9)) [299,364,365]. Shown as Fig.…”

Constructing CdS/Cd/doped TiO2 Z-scheme type visible light photocatalyst for H2 production

“…After that, different solid state Z-schemes were extensively investigated. Many semiconductors such as, CdS [17,18], AgX [19], g-C 3 N 4 [20], Cu 2 O [21], doped SrTiO 3 [22], CuGaS 2 [23] and others were employed as PSI photocatalyst. Most PSII photocatalysts were chosen from TiO 2 [24], ZnO [25], WO 3 [26], Ag 3 PO 4 [27], BiVO 4 [28], etc.…”