Journal
CATALYSIS COMMUNICATIONS
Volume 61, Issue -, Pages 6-10Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.catcom.2014.11.029
Keywords
Upconversion; Photocatalyst; Near-infrared light; Er3+ ions; Tm3+ ions
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Funding
- Science and Technology Commission of Shanghai Municipality [14DZ1207306]
- National Natural Science Foundation of China [41173108]
- Shanghai Rising-Star Program [14QA1402400]
- National Key Technology RD Program [2014BAL02B03-4]
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Er3+ and Tm3+ ions are the important lanthanides used in the near-infrared (NIR) photocatalysts with upconversion properties, while their individual contributions to the photocatalytic activities are still unclear yet. Herein, two NIR photocatalysts of Er3+/Yb3+ codoped (CaWO4@(TiO2/CaF2) (EY-CTC) and Tm3+/Yb3+ codoped (CaWO4@(TiO2/CaF2) (TY-CTC) are synthesized, and their photocatalytic activities are tested by the methyl orange degradation processes. A higher NIR-driven degradation rate (1921%) is found over TY-CTC compared to EY-CTC with 12.93%. In contrast, due to the stronger UV light absorption and the more efficient electron-hole pair separation, EY-CTC exhibits better photocatalytic activity (99.02%) compared to TY-CTC (94.43%) under UV-vis-NIR irradiation. (C) 2014 Elsevier B.V. All rights reserved.
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