TY - JOUR
T1 - Ultrasound-assisted decoration of CuOx nanoclusters on TiO2 nanoparticles for additives free photocatalytic hydrogen production and biomass valorization by selective oxidation
AU - Giannakoudakis, Dimitrios A.
AU - Qayyum, Abdul
AU - Nair, Vaishakh
AU - Khan, Ayesha
AU - Pradhan, Swaraj R.
AU - Prekodravac, Jovana
AU - Rekos, Kyriazis
AU - LaGrow, Alec P.
AU - Bondarchuk, Oleksandr
AU - Łomot, Dariusz
AU - Triantafyllidis, Konstantinos S.
AU - Colmenares, Juan Carlos
N1 - Publisher Copyright:
© 2021
PY - 2021/9
Y1 - 2021/9
N2 - The herein presented ultrasound-assisted ultra-wet (US-UWet) impregnation synthetic approach was followed in order to avoid the drawbacks of the conventional wet impregnation synthesis. The goal was to homogeneously decorate the surface of the TiO2 nanoparticles with nanometric sized (< 4 nm) clusters of mixed cupric and cuprous oxides. The physicochemical features of the nanocomposite (TiO2[sbnd]CuOx) were determined by high-angle annular dark-field scanning transmission electron microscope (HAADF-STEM), high-resolution transmission electron microscopy (HR-TEM), energy dispersive X-ray (EDX), X-ray photoelectron spectroscopy (XPS), powder X-ray diffraction (XRD), and Diffuse reflectance (DR) spectroscopy. TiO2[sbnd]CuOx showed an enhanced and continuous capability to generate molecular hydrogen upon low power ultraviolet irradiation. The benchmark commercial TiO2 P25 did not reveal any H2 formation under these conditions. TiO2[sbnd]CuOx presented also a high efficiency for the additives-free selective partial oxidation of two well established biomass derived model platform chemicals/building blocks, 5-hydroxymethylfurfural (HMF) and benzyl alcohol (BnOH) to the value-added chemicals 2,5-diformylfuran (DFF) and benzyl aldehyde (PhCHO), respectively. The nanocomposite showed higher DFF and PhCHO yield compared to P25.
AB - The herein presented ultrasound-assisted ultra-wet (US-UWet) impregnation synthetic approach was followed in order to avoid the drawbacks of the conventional wet impregnation synthesis. The goal was to homogeneously decorate the surface of the TiO2 nanoparticles with nanometric sized (< 4 nm) clusters of mixed cupric and cuprous oxides. The physicochemical features of the nanocomposite (TiO2[sbnd]CuOx) were determined by high-angle annular dark-field scanning transmission electron microscope (HAADF-STEM), high-resolution transmission electron microscopy (HR-TEM), energy dispersive X-ray (EDX), X-ray photoelectron spectroscopy (XPS), powder X-ray diffraction (XRD), and Diffuse reflectance (DR) spectroscopy. TiO2[sbnd]CuOx showed an enhanced and continuous capability to generate molecular hydrogen upon low power ultraviolet irradiation. The benchmark commercial TiO2 P25 did not reveal any H2 formation under these conditions. TiO2[sbnd]CuOx presented also a high efficiency for the additives-free selective partial oxidation of two well established biomass derived model platform chemicals/building blocks, 5-hydroxymethylfurfural (HMF) and benzyl alcohol (BnOH) to the value-added chemicals 2,5-diformylfuran (DFF) and benzyl aldehyde (PhCHO), respectively. The nanocomposite showed higher DFF and PhCHO yield compared to P25.
KW - Benzyl alcohol
KW - Biomass photocatalytic valorization
KW - HMF selective photo-oxidation
KW - Hydrogen generation
KW - Nano-engineered titanium dioxide
KW - Ultrasound assisted synthesis
UR - https://www.scopus.com/pages/publications/85107409142
U2 - 10.1016/j.mcat.2021.111664
DO - 10.1016/j.mcat.2021.111664
M3 - Article
AN - SCOPUS:85107409142
SN - 2468-8231
VL - 514
JO - Molecular Catalysis
JF - Molecular Catalysis
M1 - 111664
ER -
