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Comparison of photocatalytic activities between Er3 +/Yb3 + and Tm3 +/Yb3 + codoped (CaWO4@(TiO2/CaF2)) near-infrared photocatalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
50530 46801 2015 5 PDF Available
Title
Comparison of photocatalytic activities between Er3 +/Yb3 + and Tm3 +/Yb3 + codoped (CaWO4@(TiO2/CaF2)) near-infrared photocatalysts
Abstract

•Two kinds of Er3 + and Tm3 + doped NIR photocatalysts are synthesized.•Tm3 + is better for the improvement of NIR-driven photoactivity compared to Er3 +.•Er3 +-sample has stronger UV light absorption compared to Tm3 +-sample.•Er3 +-sample displays higher UV–vis-NIR response photoactivity compared to Tm3 +-sample.

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 (19.21%) 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.

Graphical abstractThe individual contributions of Er3 + and Tm3 + ions on the photocatalytic activities are compared. A higher NIR-driven degradation rate (19.21%) is found over Tm3 +/Yb3 + codoped (CaWO4@(TiO2/CaF2) (TY-CTC) compared to Er3 +/Yb3 + codoped (CaWO4@(TiO2/CaF2) (EY-CTC) with 12.93%. Due to the stronger UV light absorption and the efficient electron–hole pair separation, better photocatalytic activity is obtained in EY-CTC (99.02%) compared to TY-CTC (94.43%) under UV–vis-NIR irradiation.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Upconversion; Photocatalyst; Near-infrared light; Er3 + ions; Tm3 + ions
First Page Preview
Comparison of photocatalytic activities between Er3 +/Yb3 + and Tm3 +/Yb3 + codoped (CaWO4@(TiO2/CaF2)) near-infrared photocatalysts
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 61, 10 February 2015, Pages 6–10
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis