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Two Different Roles of Metallic Ag on Ag/AgX/BiOX (X = Cl, Br) Visible Light Photocatalysts: Surface Plasmon Resonance and Z-Scheme Bridge
journal contribution
posted on 2012-08-03, 00:00 authored by Liqun Ye, Jinyan Liu, Chuqing Gong, Lihong Tian, Tianyou Peng, Ling ZanAg/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.
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Keywords
field emission scanning electron microscopyVLD photocatalytic activitysurface plasmon resonancereflectance spectrachemical bath methodDifferent Rolesphotocatalytic mechanismsSurface Plasmon Resonancetransmission electron microscopyVisible Light Photocatalystsrhodamine Bquantification experimentsUVMetallic Ag
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