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Generation of Oxygen Vacancy and OH Radicals: A Comparative Study of Bi 2 WO 6 and Bi 2 WO 6− x Nanoplates
Author(s) -
Liu Yang,
Wei Bo,
Xu Lingling,
Gao Hong,
Zhang Mingyi
Publication year - 2015
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.201500714
Subject(s) - radical , oxygen , rhodamine b , photocatalysis , chemistry , photochemistry , valence (chemistry) , visible spectrum , band gap , hydroxyl radical , inorganic chemistry , catalysis , materials science , organic chemistry , optoelectronics
A comparative study of visible‐light‐responsive Bi 2 WO 6 and oxygen‐deficient Bi 2 WO 6− x nanoplates was conducted. The formation of oxygen vacancy resulted in the band gap narrowing of oxygen‐deficient Bi 2 WO 6− x , through an elevation of both of the conduction and valence band positions. FTIR spectra revealed that much more surface hydroxyl groups have been detected after the etching process. The scavengers tests confirmed the generation of ⋅OH radicals during photochemical reaction for Bi 2 WO 6− x , whereas no . OH radicals can be detected for pure Bi 2 WO 6 . The photocatalytic activities of optimized Bi 2 WO 6− x on the decomposition of Rhodamine B (RhB) was three times as high as that of pure Bi 2 WO 6 . The improvement of photocatalytic activity on degradation of RhB and phenol can be ascribed to the synergistic effect of oxygen deficiency‐induced band shifts, together with the large quantities of surface hydroxyl groups providing active sites for the generation of OH radicals ( . OH).