The effect of microemulsion composition on the morphology of Pd nanoparticles deposited at the surface of TiO2 and photoactivity of Pd-TiO2

Marta Długokęcka , Justyna Łuczak , Żaneta Polkowska , Adriana Zaleska-Medynska

Abstract

A series of microemulsion (ME) system, constituted by different water to surfactant molar ratios (Wo) and oil to surfactant mass ratios (S), have been applied for Pd-TiO2 preparation. The effect of ME properties on the morphology of Pd nanoparticles formed at TiO2 surface and an effect of Pd size and distribution on the surface and photocatalytic properties of Pd-TiO2 were investigated. Microemulsion systems were characterized by means of viscosity, density, dynamic light scattering as well as surface tension measurements to find a correlation between the conditions of Pd nanoparticles formation, their morphology and photocatalyst features. The photocatalysts were characterized by transmission electron microscopy (TEM), X-ray diffraction analysis (XRD), UV–vis diffuse-reflectance spectroscopy (DRS), BET surface area and elemental analysis. The photocatalytic properties of Pd-modified TiO2 particles were studied in a model reaction of phenol photodegradation under Vis irradiation, as well as active species involved in the photocatalytic reaction were determined. Microemulsion composition was found to be a crucial parameter in determining the features of the TiO2-based photocatalysts covered by metallic nanoparticles. The highest photocatalytic activity under Vis radiation was observed for the Pd-TiO2 sample (average diameter 2.4 nm) obtained using 0.1 mol% Pd in the ME system containing 1.5 wt% of water and 82.8 wt% of cyclohexane with average droplet size of 2.83 ± 0.18 nm. In this regard, synthesis of such metal-semiconductor composites through the microemulsion route should always be preceded by investigation of ME properties in order to the eliminate the inhibitory effect of ME internal structure.
Author Marta Długokęcka
Marta Długokęcka,,
-
, Justyna Łuczak
Justyna Łuczak,,
-
, Żaneta Polkowska
Żaneta Polkowska,,
-
, Adriana Zaleska-Medynska PFotokatalizy
Adriana Zaleska-Medynska,,
- Laboratory of Photocatalysis
Other language title versions
Journal seriesApplied Surface Science, ISSN 0169-4332
Issue year2017
Vol405
Pages220-230
Publication size in sheets0.5
Keywords in EnglishPd-TiO2, Pd deposition, characteristics of microemulsion system, preparative conditions, Pd size distribution, photocatalytic performance
DOIDOI:10.1016/j.apsusc.2017.02.014
URL https://doi.org/10.1016/j.apsusc.2017.02.014
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)
Citation count*0
Cite
Share Share



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