Green Synthesized of Ag/Ag2O Nanoparticles Using Aqueous Leaves Extracts of Phoenix dactylifera L. and Their Azo Dye Photodegradation

Abstract

In this study, silver/silver oxide nanoparticles (Ag/Ag2O NPs) were successfully biosynthesized using Phoenix dactylifera L. aqueous leaves extract. The effect of different plant extract/precursor contractions (volume ratio, v/v%) on Ag/Ag2O NP formation, their optical properties, and photocatalytic activity towards azo dye degradation, i.e., Congo red (CR) and methylene blue (MB), were investigated. X-ray diffraction confirmed the crystalline nature of Ag/Ag2O NPs with a crystallite size range from 28 to 39 nm. Scanning electron microscope images showed that the Ag/Ag2O NPs have an oval and spherical shape. UV–vis spectroscopy showed that Ag/Ag2O NPs have a direct bandgap of 2.07–2.86 eV and an indirect bandgap of 1.60–1.76 eV. Fourier transform infrared analysis suggests that the synthesized Ag/Ag2O NPs might be stabilized through the interactions of -OH and C=O groups in the carbohydrates, flavonoids, tannins, and phenolic acids present in Phoenix dactylifera L. Interestingly, the prepared Ag/Ag2O NPs showed high catalytic degradation activity for CR dye. The photocatalytic degradation of the azo dye was monitored spectrophotometrically in a wavelength range of 250–900 nm, and a high decolorization efficiency (84.50%) was obtained after 50 min of reaction. As a result, the use of Phoenix dactylifera L. aqueous leaves extract offers a cost-effective and eco-friendly method.

A Novel Biodegradable Composite Polymer Material Based on PLGA and Silver Oxide Nanoparticles with Unique Physicochemical Properties and Biocompatibility with Mammalian Cells

“…The nonlinear dependence of Tg and thermal conductivity of the nanocomposite on the dopant concentration was found by us in previous studies and is described in the literature [71,72]. The nonlinear character of the dependence of the Tg of the nanocomposite on the dopant concentration was also found in mathematical modeling [73]. According to the literature, the main mechanism of the complex change in Tg with increasing NPs concentration is competition between the attraction of nanoparticles to polymer chains and rapid diffusion of nanoparticles at the initial stage of polymer composite synthesis [73].…”

“…The nonlinear character of the dependence of the Tg of the nanocomposite on the dopant concentration was also found in mathematical modeling [73]. According to the literature, the main mechanism of the complex change in Tg with increasing NPs concentration is competition between the attraction of nanoparticles to polymer chains and rapid diffusion of nanoparticles at the initial stage of polymer composite synthesis [73]. The aggregation of NPs with an increase in their concentration in the polymer matrix can also be one of the mechanisms for changing the properties of the polymer matrix.…”

Antimicrobial Activity of Blow Spun PLA/Gelatin Nanofibers Containing Green Synthesized Silver Nanoparticles against Wound Infection-Causing Bacteria

“…Nanotechnology is the manipulation of nanoscale materials in various fields such as engineering, materials science, chemistry, and biology [ 1 , 2 , 3 , 4 ]. This area of research has been compared to the industrial revolution as one of the most essential aspects of science and technology in the twenty-first century [ 5 , 6 ]. Nanomaterials are, in principle, materials in which a single unit small-sized (in at least one dimension) between 1 and 100 nm has unique properties such as small size and surface-to-volume ratio in comparison with their bulk components, which provide specific light or have magnetic, surface, and electrical or chemical properties.…”

A New Approach for the Green Biosynthesis of Silver Oxide Nanoparticles Ag2O, Characterization and Catalytic Application

“…Nanotechnology is defined as "the creation and use of structures, devices, and systems characterized by their distinct and varied characteristics and infinitesimal size, typically to deal with particles in the size range 1-100 nm [1]. At these scales, the material acquires properties that are unusual and often different from those of the same materials in bulk: they should be considered as new chemical compounds with different toxicities and characteristics [2].…”