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

Abstract

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
Vol203
Pages452-464
Publication size in sheets0.6
Keywords in EnglishCdTe quantum dots, photocatalysis, perovskite-type KTaO3, bifunctional linker
DOIDOI:10.1016/j.apcatb.2016.10.027
URL http://dx.doi.org/10.1016/j.apcatb.2016.10.027
Languageen angielski
Score (nominal)45
ScoreMinisterial score = 45.0, 20-12-2017, ArticleFromJournal
Ministerial score (2013-2016) = 45.0, 20-12-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 9.446 (2) - 2016=8.87 (5)
Citation count*
Cite
Share Share

Get link to the record


* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
Back