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Plasmonic‐enhanced visible‐light‐driven photocatalytic activity of Ag–AgBr synthesized in reactable ionic liquid
Author(s) -
Xu Hui,
Song Yanhua,
Liu Ling,
Li Huaming,
Xu Yuanguo,
Xia Jiexiang,
Wu Xiangyang,
Zhao Shuowei
Publication year - 2012
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.3841
Subject(s) - photocatalysis , silver halide , materials science , halide , reagent , plasmon , metal , degradation (telecommunications) , chemical engineering , ionic bonding , silver bromide , visible spectrum , catalysis , photochemistry , inorganic chemistry , nanotechnology , chemistry , metallurgy , ion , optoelectronics , organic chemistry , telecommunications , layer (electronics) , computer science , engineering
Abstract BACKGROUND: Plasmonic photocatalysts have attracted considerable attention because of their applications in the degradation of organic pollutants. In order to enhance the stability of AgX photocatalyst, Ag/AgCl, Ag/AgBr/WO 3 , and Ag@AgCl/RGO were developed. Results implied that silver halides could maintain stability if the metal Ag was well dispersed on the silver halide particles and could display high catalytic activity. RESULTS: PVP acted as a structure‐directing agent, and a reducing reagent in the reaction. Results show that Ag–AgBr delivered a much higher photocatalytic activity than AgBr and Ag–AgCl. The high photocatalytic activity of the Ag–AgBr composites can be attributed to the presence of metal Ag and the smaller particle size of the samples. The photocatalytic reaction followed first‐order kinetics. The rate constant k for the degradation of MO by Ag–AgBr was 2 and 18 times higher than that of AgBr and Ag–AgCl, respectively. CONCLUSIONS: The MO degradation efficiency of Ag–AgBr was 94% after 10 min. After 5 cycles of repeatability tests, the degradation efficiency of MO still remained at 90%. The high photocatalytic activity of the Ag–AgBr composites can be attributed to the presence of metal Ag and the smaller particle size of the samples. Copyright © 2012 Society of Chemical Industry