Characterization of iron-polyphenol complex nanoparticles synthesized by Sage (Salvia officinalis) leaves

In this paper iron-polyphenol complex nanoparticles (Fe-P NPs) were synthesized by Sage (Salvia officinalis) leaf extract, which have excellent adsorptive-flocculation capacity for water treatment. They were characterized using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared Spectroscopy (FTIR) and X-ray diffraction (XRD) so that their surface properties could be understood. It was found that synthesized Fe-P NPs were cross-linked in colloid with spherical particles ranged from 5 to 25 nm. Their surfaces were capped with O-H groups. Dried powder derived from Fe-P NPs colloid can remain stable after several hours and then be partially oxidized to iron oxide on exposure to air. Removal of cationic dye ethyl violet with Fe-P NPs was tested to confirm that the surface charge on Fe-P NPs is positive. (C) 2015 Elsevier B.V. All rights reserved.