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Bismuth‐Doped Ordered Mesoporous TiO 2 : Visible‐Light Catalyst for Simultaneous Degradation of Phenol and Chromium
Author(s) -
Sajjad Shamaila,
Leghari Sajjad A. K.,
Chen Feng,
Zhang Jinlong
Publication year - 2010
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201001099
Subject(s) - photocatalysis , mesoporous material , bismuth , materials science , visible spectrum , raman spectroscopy , x ray photoelectron spectroscopy , doping , chemical engineering , chromium , catalysis , inorganic chemistry , chemistry , organic chemistry , optoelectronics , optics , physics , metallurgy , engineering
A controllable and reproducible synthesis of highly ordered two‐dimensional hexagonal mesoporous, crystalline bismuth‐doped TiO 2 nanocomposites with variable Bi ratios is reported here. Analyses by transmission electron microscopy, X‐ray diffraction, Raman, and X‐ray photoelectron spectroscopy reveal that the well‐ordered mesostructure is doped with Bi, which exists as Bi 3+ and Bi (3+ x +) . The Bi‐doped mesoporous TiO 2 (ms‐TiO 2 ) samples exhibit improved photocatalytic activities for simultaneous phenol oxidation and chromium reduction in aqueous suspension under visible and UV light over the pure ms‐TiO 2 , P‐25, and conventional Bi‐doped titania. The high catalytic activity is due to both the unique structural characteristics and the Bi doping. This new material extends the spectral response from UV to the visible region, and reduces electron–hole recombination, which renders the 2.0 % Bi‐doped ms‐TiO 2 photocatalyst highly responsive to visible light.