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

被引：54

作者：

Bajorowicz, Beata ^{[1
]}

Nadolna, Joanna ^{[1
]}

Lisowski, Wojciech ^{[2
]}

Klimczuk, Tomasz ^{[3
]}

Zaleska-Medynska, Adriana ^{[1
]}

机构：

[1] Univ Gdansk, Fac Chem, Dept Environm Technol, Wita Stwosza 63, PL-80308 Gdansk, Poland

[2] Polish Acad Sci, Inst Phys Chem, Kasprzaka 44-52, PL-01224 Warsaw, Poland

[3] Gdansk Univ Technol, Fac Appl Phys & Math, Dept Solid State Phys, Narutowicza 11-12, PL-80233 Gdansk, Poland

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2017年 / 203卷

关键词：

CdTe quantum dots; Photocatalysis; Perovskite-type KTaO3; Bifunctional linker; INTERFACIAL ELECTRON-TRANSFER; VISIBLE-LIGHT IRRADIATION; OXYGEN ACTIVATION ABILITY; FLOWER-LIKE BIOBR; HYDROTHERMAL SYNTHESIS; SOLAR-CELLS; POTASSIUM TANTALATE; MECHANISM INSIGHT; AQUEOUS SYNTHESIS; FACILE SYNTHESIS;

D O I：

10.1016/j.apcatb.2016.10.027

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 (lambda(max) =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. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：452 / 464

页数：13

共 73 条

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