The effects of bifunctional linker and reflux time on the surface properties and photocatalytic activity of CdTe quantum dots decorated KTaO3 composite photocatalysts

Beata Bajorowicz , Joanna Nadolna , Wojciech Lisowski , Tomasz Klimczuk , Adriana Zaleska-Medynska


Novel CdTe-KTaO3 composite photocatalysts were successfully synthesized by using thioglycolic acid (TGA) or 3-mercaptopropionic acid (MPA) as linker molecules which facilitated attachment of CdTe quantum dots to the surface of KTaO3 nanocubes. The as-prepared photocatalysts were characterized by 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), Fourier transform infrared spectroscopy (FT-IR), Brunauer–Emmett–Teller (BET) specific surface area, X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL) emission spectroscopy. The obtained CdTe-decorated KTaO3 composites showed greatly improved photocatalytic performance for degradation of toluene in the gas phase under LEDs light irradiation (λmax = 415 nm) over pristine KTaO3. TGA-functionalized CdTe-KTaO3 composites exhibited higher photocatalytic activity as compared with MPA-capped CdTe-KTaO3 hybrids which can be ascribed to the shorter chain length of TGA molecule as compared with MPA linker and therefore faster electron transfer from TGA-CdTe nanodots to perovskite-type potassium tantalate. The significance of quantum size effect of CdTe QDs for enhancing photocatalytic performance of CdTeQDs-decorated KTaO3 was also discussed.
Author Beata Bajorowicz (FCh / DET / LPh)
Beata Bajorowicz,,
- Laboratory of Photocatalysis
, Joanna Nadolna (FCh / DET / LPh)
Joanna Nadolna,,
- Laboratory of Photocatalysis
, Wojciech Lisowski
Wojciech Lisowski,,
, Tomasz Klimczuk
Tomasz Klimczuk,,
, Adriana Zaleska-Medynska (FCh / DET / LPh)
Adriana Zaleska-Medynska,,
- Laboratory of Photocatalysis
Journal seriesApplied Catalysis B: Environmental, ISSN 0926-3373, (A 45 pkt)
Issue year2017
Publication size in sheets0.6
Keywords in EnglishCdTe quantum dots, photocatalysis, perovskite-type KTaO3, bifunctional linker
ASJC Classification1508 Process Chemistry and Technology; 2300 General Environmental Science; 1503 Catalysis
Languageen angielski
Score (nominal)45
Score sourcejournalList
ScoreMinisterial score = 45.0, 17-11-2019, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2017 = 2.367; WoS Impact Factor: 2017 = 11.698 (2) - 2017=10.212 (5)
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