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Highly Efficient Visible Light Plasmonic Photocatalysts Ag@Ag(Cl,Br) and Ag@AgCl‐AgI
Author(s) -
Wang Peng,
Huang Baibiao,
Zhang Xiaoyang,
Qin Xiaoyan,
Dai Ying,
Wang Zeyan,
Lou Zaizhu
Publication year - 2011
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201000380
Subject(s) - visible spectrum , surface plasmon resonance , plasmon , silver halide , halide , photochemistry , materials science , photocatalysis , nanoparticle , ion , chemistry , inorganic chemistry , catalysis , nanotechnology , optoelectronics , organic chemistry , layer (electronics)
New plasmonic photocatalysts Ag@Ag(Cl,Br) and Ag@AgCl‐AgI were synthesized by the ion‐exchange process between AgCl and a potassium halide (KBr, KI), then by reducing some Ag + ions in the surface region of Ag(Cl,Br) and AgCl‐AgI particles to Ag 0 species. The Ag nanoparticles were formed from Ag(Cl,Br) and AgCl‐AgI by a light‐induced chemical reduction. The Ag@Ag(Cl,Br) and Ag@AgCl‐AgI particles have irregular shapes and their sizes vary between 100 nm and 1.3 μm. The as‐grown plasmonic photocatalysts show strong absorption in the visible‐light region, owing to the plasmon resonance of Ag nanoparticles. The ability of this compound to oxidize methylic orange and reduce Cr VI under visible light was compared with those of other reference photocatalysts. These plasmonic photocatalysts have been shown to be highly efficient under visible‐light irradiation.