Rosa damascena waste mediated synthesis of silver nanoparticles: Characteristics and application for an electrochemical sensing of hydrogen peroxide and vanillin

Publication date: Available online 16 April 2019Source: Materials Chemistry and PhysicsAuthor(s): Totka Dodevska, Ivelina Vasileva, Petko Denev, Daniela Karashanova, Biliana Georgieva, Daniela Kovacheva, Nikoleta Yantcheva, Anton SlavovAbstractSilver nanoparticles (AgNPs) were synthesized by reduction of Ag+ with four extracts of Rosa damascena waste: post-distillation water (PW), water extract (WE), 30% (30 EE) and 70% (70 EE) ethanol extracts. The ethanolic extracts were rich in polyphenols and particularly catechin and epicatechin (1388.01 ± 2.27 and 677.47 ± 2.03 μgmL−1, respectively) while the water extracts were rich in reducing sugars, proteins and pectic substances (for WE 254.21 ± 1.26, 296.89 ± 2.01 and 242.14 ± 1.38 μgmL−1, and for PW 185.72 ± 1.47, 298.30 ± 1.57 and 181.78 ± 1.39 μgmL−1, respectively). The morphology of AgNPs was characterized by transmission electron microscopy and the calculated average size of the AgNPs synthesized using WE and PW was 25.8 ± 11.5 nm and 11.5 ± 8.4 nm, respectively. The X-ray diffraction analysis suggested presence of silver phase which crystallized in a face centered cubic space group Fm-3m with unit cell parameter 4.085 (2) Å and mean coherent domain size 10.9 (3)nm. Biosynthesized AgNPs were deposited onto a spectroscopic graphite electrode (GE), applying two different procedures, and stabilized using chitosan to build modified electrodes-catalysts. The...
Source: Materials Chemistry and Physics - Category: Materials Science Source Type: research