No abstract

Ultrafine ruthenium oxide nanoparticles (RuO 2 NPs) of an average diameter of 1.3 nm were anchored on graphene nanoplatelets (GNPs) using Ru(acac) 3 precursor by a very simple dry synthesis method. The resultant material (GNPs-RuO 2 NPs) was used as a heterogeneous catalyst for the N-oxidation of tertiary amines for the first time. The transmission electron microscopic (TEM) images of the GNPs-RuO 2 NPs 10 showed an excellent attachment of RuO 2 NPs on GNPs. The loading of Ru in GNPs-RuO 2 NPs was 2.68 wt%, as confirmed by scanning electron microscope-energy dispersive spectroscopy (SEM-EDS). X-ray photoelectron spectrum (XPS) and X-ray diffraction pattern (XRD) of GNPs-RuO 2 NPs revealed that the chemical state of Ru on GNPs was +4. After the optimization of reaction conditions for N-oxidation of triethylamine, the scope of the reaction was extended with a various aliphatic, alicyclic and aromatic 15 tertiary amines. The GNPs-RuO 2 NPs showed an excellent catalytic activity in terms of yields even at a very low amount of Ru catalyst (0.13 mol%). The GNPs-RuO 2 NPs was heterogeneous in nature, chemically as well as physically very stable and reused for up to 5 times.

Herein, we report a new Prussian blue nanoparticle (PBNPs) incorporated polyvinyl alcohol (PVA) composite nanofiber (c-PBNPs/PVA) for a rapid adsorption of cesium (Cs) from the radioactive 10 wastewater. Initially, various electrospinning parameters such as solvent, PVA wt%, PBNPs wt% and glutaraldehyde (GA) wt% were extensively optimized to obtain a better physicochemical property of the c-PBNPs/PVA. In order to improve the water insoluble nature of the PVA, a post cross-linking was carried out for the c-PBNPs/PVA using glutaraldehyde (GA) and HCl vapor as cross-linker and catalyst, respectively. SEM images revealed smooth and continuous morphology of the c-PBNPs/PVA composite 15 nanofibers with diameters of 200-300 nm and lengths up to several millimeters. TEM images confirmed homogeneous dispersion and well incorporation of PBNPs into PVA matrix. The amorphous nature of the c-PBNPs/PVA was confirmed by the XRD analysis. FT-IR spectra showed successful cross-linking of PVA with GA. It was found that the prepared composite nanofiber is highly hydrophilic and waterinsoluble. The c-PBNPs/PVA showed an excellent and faster Cs adsorption rate of 96 % after only 100 20 min. These results are well comparable to those previous reported. After the Cs adsorption test, the cPBNPs/PVA composite nanofiber can be easily separated from the wastewater.

No abstract

The development of biocompatible nanocomposites for biomedical applications such as drug release has attracted increasing attention in recent years.