Various types of semiconductor photocatalysts modified by CdTe QDs and Pt NPs for toluene photooxidation in the gas phase under visible light

Martyna Marchelek , Ewelina Grabowska , Tomasz Klimczuk , Wojciech Lisowski , Adriana Zaleska-Medynska

Abstract

A novel synthesis process was used to prepare TiO2 microspheres, TiO2 P-25, SrTiO3 and KTaO3 decorated by CdTe QDs and/or Pt NPs. The effect of semiconductor matrix, presence of CdTe QDs and/or Pt NPs on the semiconductor surface as well as deposition technique of Pt NPs (photodeposition or radiolysis) on the photocatalytic activity were investigated. The as-prepared samples were characterized by X-ray powder diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) with energy-dispersive X-ray (EDX) spectroscopy, scanning electron microscopy (SEM), photoluminescence spectrometry (PL), Fourier transform infrared (FT-IR) and Raman spectra, diffuse reflectance spectroscopy (DRS) and BET surface area analysis. The photocatalytic decomposition of toluene in gas phase, activated by light-emitting diodes (LEDs), with the CdTe/Pt nanoparticles-modified TiO2 microspheres, P25, SrTiO3 and KTaO3 semiconductors was investigated under UV–vis and visible irradiation.The results showed that the photoactivity depends on semiconductor matrix. The highest photoactivity under Vis light was observed for KTaO3/CdTe-Pt(R) sample (56% of toluene was decompose after 30 min of irradiation). The efficiency of the most active sample was 3 times higher than result for P25 and two times higher than for unmodified KTaO3.
Author Martyna Marchelek PFotokatalizy
Martyna Marchelek ,,
- Laboratory of Photocatalysis
, Ewelina Grabowska PFotokatalizy
Ewelina Grabowska,,
- Laboratory of Photocatalysis
, Tomasz Klimczuk
Tomasz Klimczuk,,
-
, Wojciech Lisowski
Wojciech Lisowski,,
-
, Adriana Zaleska-Medynska PFotokatalizy
Adriana Zaleska-Medynska,,
- Laboratory of Photocatalysis
Other language title versions
Journal seriesApplied Surface Science, ISSN 0169-4332
Issue year2017
Vol393
Pages262-275
Publication size in sheets0.65
Keywords in EnglishTiO2, KTaO3, SrTiO3, CdTe quantum dots, Pt nanoparticles, nanocomposites
DOIDOI:10.1016/j.apsusc.2016.10.009
URL http://dx.doi.org/10.1016/j.apsusc.2016.10.009
Languageen angielski
Score (nominal)35
ScoreMinisterial score = 35.0, 20-12-2017, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 20-12-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 3.387 (2) - 2016=3.184 (5)
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