The effect of gold shape and size on the properties and visiblelight-induced photoactivity of Au-TiO2
PBN-AR
Instytucja
Wydział Chemiczny (Politechnika Gdańska)
Informacje podstawowe
Główny język publikacji
ENG
Czasopismo
APPLIED CATALYSIS B-ENVIRONMENTAL
ISSN
0926-3373
EISSN
Wydawca
DOI
URL
Rok publikacji
2016
Numer zeszytu
Strony od-do
27-40
Numer tomu
196
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
AU-TIO2SHAPSIZEGOLD NPSPHOTOCATALYSISA
Streszczenia
Język
Treść
tIn the present investigation, TiO2modified with a different geometry and size of gold particles, suchas nanospheres (NSPs), nanostars (NSTs) and nanorods (NRs), were prepared by the immobilizationmethod. The effect of the gold shape, size and TiO2matrix type (TiO2microspheres or rutile TIO-6 TiO2)were systematically investigated. The obtained photocatalysts were thoroughly characterized by UV–visdiffuse-reflectance spectroscopy (DRS), BET surface area measurements, scanning electron microscopy(SEM), scanning transmission microscopy (TEM), X-ray diffraction analysis (XRD), and X-ray photoelec-tron spectroscopy (XPS). The photocatalytic activity under visible light ( > 420 nm) has been estimatedin phenol degradation reaction in an aqueous phase. The significantly high photocatalytic activity undervisible light irradiate as demonstrated by the TiO2sample modified by spheres of gold. The average rateof phenol decomposition was 1.9 mol dm−3min−1and was three-times higher compared to the pristineTiO2amorphous microspheres. On the other hand the photocatalytic activity was relatively lower and was0.38 and 0.27 mol dm−3min−1for nanorods and nanostars deposited on the amorphous form of TiO2microspheres, respectively. The visible light activity decreased in following order: (NSPs)> (NRs)> (NSTs).The obtained photocatalytic efficiency of samples was ascribed to the geometry and the size effect ofthe enhanced and the possible mechanism for this was discussed in detail. Furthermore, in this work weshow the effect of calcination temperature on the structure of gold NPs, NRs and NSs before and aftermodification on the morphology and photocatalytic activity of Au-TiO2.
Inne
System-identifier
136753
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