Process Optimization for the Synthesis of Silver (AgNPs), Iron Oxide (α-Fe2O3NPs) and Core-Shell (Ag-Fe2O3CNPs) Nanoparticles Using the Aqueous Extract of Alstonia Scholaris: A Greener Approach

Abstract

Objective:The present study is deals with the green synthesis of silver (AgNPs), iron oxide (α-Fe2O3NPs) and core-shell (Ag-α-Fe2O3CNPs) nanoparticles using the aqueous extract ofAlstonia scholariswithout any catalyst, template or surfactant or any intermediate under ultrasound cavitation technique. The purpose was to facilitate the high level of dispersion with increase in rate of reaction. Further AgNPs and α-Fe2O3NPs were used to synthesis Ag-Fe2O3CNPs in aqueous extract ofAlstonia scholarisunder controlled ultrasound cavitation technique.Methods:The size of AgNPs and Ag-Fe2O3CNPs can be tuned by optimizing various reaction parameters. UV-visible, X-ray diffraction spectroscopy (XRD), Transmission electron microscopy (TEM), Field emission scanning electron microscope (FE-SEM) and Fourier transform infra-red spectroscopy has been used for the characterization of silver and core shell Ag@Fe2O3nanoparticles. TEM images clearly show the formation of core shell nanoparticles with spherical morphology.Result:Fourier transform infra-red spectroscopy analysis revealed that carbohydrate, polyphenols, and protein molecules were involved in the synthesis and capping of silver, iron oxide and Ag@Fe2O3CNPs.

Influence of Synthesis Method on Structural, Morphological, Magnetic, and Antimicrobial Properties of Fe-Ag Nanoparticles

“…033-0664, respectively. The intensive peaks depicted fit the works of Shimpi et al [29] who synthesized core-shell Ag/Fe 2 O 3 NPs using an aqueous extract of Alstonia scholaris. By fitting the values to the Scherrer equation, the average size of the particle was found to be 39.59 nm.…”

“…Additionally, the absorption bands around 1000 cm −1 were assigned to the C-N of aliphatic amines or alcohols/phenols [37] with absorption bands located around 1300 and 1600 cm −1 representing the symmetric and asymmetric bending modes of C = O bonds of amino acid and esters, respectively [30]. Finally, the broad peaks centred approximately around 2000, and 3400 cm −1 are associated respectively with standard H 2 O bending modes and OH stretching [29]. The temperature of the samples was kept constant at 300 K during the measurement.…”

“…Furthermore, producing NPs with a green synthesis method using plant extracts whereby the approach is performed without the use of chemicals (acid or base, surfactants, and solvents), generating a limited amount of waste with few by-products, further characteristics can be imparted onto the NPs due to residues of the biomolecules or organic elements in the plant extracts being embedded, i.e., additional properties associated with the enhanced immune system and blood circulation, the memory including cognitive stimulation, etc., in the final NPs [25,28]. This is the case with NPs synthesis using some plant extracts such as Alstonia Scholaris, Crataegus pinnatifida, Passiflora edulis, Euphorbia peplus, Amaranthus blitum, Adotha vasica, Eryngium planum, Argemonemexicana, Vitis labrusa, [17,19,[29][30][31][32][33][34][35]. To the best of our knowledge, there is no finding thus regarding the synthesis of bimetallic Fe-Ag using Rosmarinus officinalis (rosemary) plant extract [36][37][38].…”

Adsorption and bacterial performance of Nd2O3 modified Ag nanoparticles with enhanced degradation of methylene blue

“…It can be observed that the broadband at 3455 cm −1 for pure oxide while adding silver NPs does not cause a noticeable shift that O–H stretching vibration of the –OH group appears at 3448 cm −1 32 . The revealing absorption peak at 3554 cm −1 is assigned to thio-urea residual N–H stretching 33 . The Neodymium oxide (Nd 2 O 3 ) NPs strong band centered at 669 cm −1 is attributed to Nd–OH which shows significant diminishing with adding Silver nano-particles 32 .…”

Development of novel Nd 2 O 3 doped Ag nanocomposite for the catalytic degradation of methylene blue and biological studies

“…It can be observed that the broadband at 3455 cm − 1 for pure oxide while adding silver NPs does not cause a noticeable shift that O-H stretching vibration of the -OH group appears at 3448 cm − 1 [14]. The revealing absorption peak at 3554 cm − 1 is attributed to thio-urea residual N-H stretching [15]. The Neodymium oxide (Nd 2 O 3 ) NPs strong band centered at 669 cm − 1 is attributed to Nd-OH which shows signi cant diminishing with adding Silver nano-particles [14].…”