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The effects of bifunctional linker and reflux time on the surface properties and photocatalytic activity of CdTe quantum dots decorated KTaO3 composite photocatalysts
Abstract
Novel CdTe-KTaO3composite photocatalysts were successfully synthesized by using thioglycolic acid(TGA) or 3-mercaptopropionic acid (MPA) as linker molecules which facilitated attachment of CdTequantum dots to the surface of KTaO3nanocubes. The as-prepared photocatalysts were characterizedby UV–vis diffuse reflectance spectroscopy (DRS), X-ray diffraction (XRD), scanning electron microscopy(SEM), transmission electron microscopy (TEM) with energy dispersive X-ray analysis (EDX), Fouriertransform infrared spectroscopy (FT-IR), Brunauer–Emmett–Teller (BET) specific surface area, X-rayphotoelectron spectroscopy (XPS) and photoluminescence (PL) emission spectroscopy. The obtainedCdTe-decorated KTaO3composites showed greatly improved photocatalytic performance for degra-dation of toluene in the gas phase under LEDs light irradiation (max= 415 nm) over pristine KTaO3.TGA-functionalized CdTe-KTaO3composites exhibited higher photocatalytic activity as compared withMPA-capped CdTe-KTaO3hybrids which can be ascribed to the shorter chain length of TGA moleculeas compared with MPA linker and therefore faster electron transfer from TGA-CdTe nanodots toperovskite-type potassium tantalate. The significance of quantum size effect of CdTe QDs for enhancingphotocatalytic performance of CdTeQDs-decorated KTaO3was also discussed.
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Authors (5)
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Beata Bajorowicz
-
Joanna Nadolna
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Wojciech Lisowski
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Adriana Zaleska-Medynska
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Details
- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
APPLIED CATALYSIS B-ENVIRONMENTAL
no. 203,
pages 452 - 464,
ISSN: 0926-3373 - Language:
- English
- Publication year:
- 2017
- Bibliographic description:
- Bajorowicz B., Nadolna J., Lisowski W., Klimczuk T., Zaleska-Medynska A.: The effects of bifunctional linker and reflux time on the surface properties and photocatalytic activity of CdTe quantum dots decorated KTaO3 composite photocatalysts// APPLIED CATALYSIS B-ENVIRONMENTAL. -Vol. 203, (2017), s.452-464
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.apcatb.2016.10.027
- Verified by:
- Gdańsk University of Technology
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