6533b858fe1ef96bd12b6554

RESEARCH PRODUCT

Green synthesis of Pd@graphene nanocomposite: Catalyst for the selective oxidation of alcohols

Muhammed Nawaz TahirWolfgang TremelMohammed Rafiq H. SiddiquiHamad Z. AlkhathlanSyed Farooq AdilMohammed Rafi ShaikMerajuddin KhanAbdulrahman Al-warthanNils MohriMufsir KuniyilMujeeb KhanAbdulhadi H. Al-marri

subject

Chemistry(all)Aromatic alcohols oxidationGeneral Chemical EngineeringInorganic chemistryOxidechemistry.chemical_elementPalladium NPs02 engineering and technology010402 general chemistry01 natural sciencesCatalysislaw.inventionCatalysislcsh:Chemistrychemistry.chemical_compoundX-ray photoelectron spectroscopylawCalcinationNatural productsNanocompositeGrapheneGeneral Chemistry021001 nanoscience & nanotechnology0104 chemical scienceslcsh:QD1-999Green chemistrychemistryAlcohol oxidationChemical Engineering(all)Graphene0210 nano-technologyPalladiumNuclear chemistry

description

Abstract Due to their excellent physicochemical properties and synergistic effect, graphene metallic NPs based nanocomposites have gained significant attention in various technological fields including catalysis. Here we demonstrate a single pot, facile and environmental friendly synthesis of catalytically active palladium(Pd)@graphene nanocomposites (SP-HRG-Pd) by the simultaneous reduction of graphene oxide (GRO) and PdCl 2 using Salvadora persica L. (miswak) root extract (RE) as bioreductant. The synthesis of SP-HRG-Pd was confirmed by various spectroscopic and microscopic techniques, including ultraviolet–visible (UV–vis), Fourier-transform infrared (FT-IR), Raman and X-ray photoelectron (XPS) spectroscopy, X-ray powder diffraction (XRD) and transmission electron microscopy (TEM). The polyphenolic (flavonoids) and terpenoids rich contents of the miswak RE not only facilitated the reduction of graphene oxide and PdCl 2 but also ensured the homogeneous binding of the Pd NPs on graphene, and through stabilization of the surface of SP-HRG-Pd nanocomposites. This also led to the enhanced dispersibility of as synthesized nanocomposites in aqueous solutions. The as-prepared SP-HRG-Pd nanocomposites also demonstrated excellent catalytic activity toward the selective oxidation of aromatic alcohols. Furthermore, in order to study the effect of calcination temperature and concentration of Pd NPs on the catalytic activities of nanocomposites, different samples of SP-HRG-Pd nanocomposites containing different amounts of Pd using various concentrations of Pd precursor were prepared and calcined at various temperatures.

10.1016/j.arabjc.2015.12.007http://dx.doi.org/10.1016/j.arabjc.2015.12.007