Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 342, Issue -, Pages 661-669Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2017.08.077
Keywords
Hydrogenated TiO2/WO3; Visible-light; Photodecomposition of toluene; Surface-oxygen-vacancies; Charge transfer and separation
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Funding
- Nature Science Foundation of Fujian Province of China [2016J01079, 2016J05049]
- Chinese Academy of Sciences [QYZDB-SSW-DQC022]
- National Natural Science Foundation of China [21501175]
- key project of the National Natural Science Foundation of China [U1463204]
- Natural Science Foundation (NSF) of Fujian Province for Distinguished Young Investigator Rolling Grant [2017J07002]
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Oxygen-deficient TiO2/WO3 constructed via the controllable temperature of hydrogen annealing is designed in view of combining the broad visible spectrum absorption with the prominent coupled semiconductor properties. Surface lattice disorder of TiO2/WO3 arises at hydrogen annealing temperature of 200 and 300 degrees C, while critical phase transition from TiO2/WO3 to TiO2/WO2.9 occurs at 400 degrees C, both of which can introduce oxygen vacancies. The hydrogenated TiO2/WO3 with rich surface-oxygen-vacancies exhibits much higher photocatalytic activity for decomposition of gaseous toluene than pristine TiO2/WO3 under visible-light illumination (lambda>420 nm). The photoelectrochemical analysis shows that the improved electronic properties of oxygen-deficient TiO2/WO3 enable dramatically efficient promotion of photoinduced charge transfer and separation, which is the key factor for the improved photocatalytic activity. It is hoped that the present work could boost ongoing interest for preparing various hydrogenated coupled semiconductors with enhanced activity for diverse photocatalytic applications. (C) 2017 Elsevier B.V. All rights reserved.
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