Alginate-Mediated Synthesis of Hetero-Shaped Silver Nanoparticles and Their Hydrogen Peroxide Sensing Ability

Abstract

A new method for the simple synthesis of stable heterostructured biopolymer (sodium alginate)-capped silver nanoparticles (Ag-NPs) based on green chemistry is reported. The as-prepared nanoparticles were characterized using the ultraviolet-visible (UV-Vis) absorption spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and dynamic light scattering (DLS) techniques. The results showed that the as-prepared Ag-NPs have a heterostructured morphology with particle size in the range 30 ± 18–60 ± 25 nm, showing a zeta potential of −62 mV. The silver nanoparticle formation was confirmed from UV-Vis spectra showing 424 nm as maximum absorption. The particle size and crystallinity of the as-synthesized nanoparticles were analyzed using TEM and XRD measurements, respectively. FTIR spectra confirmed the presence of alginate as capping agent to stabilize the nanoparticles. The Ag-NPs also showed excellent sensing capability, with a linear response to hydrogen peroxide spanning a wide range of concentrations from 10−1 to 10−7 M, which indicates their high potential for water treatment applications, such as pollution detection and nanofiltration composites.

Biosynthesized Nanosilver from Alginate Dialdehyde: An In Vitro Evaluation

“…The crystalline phase, size, and structural analysis were in good agreement with other AgNPs prepared by green synthesis using polysaccharides. [21]…”

“…Moreover, the free COO À and À OH groups in alginate can only aid in the coordination of Ag + ions. The reduction of silver salts to nanoparticles of silver was achieved either by using reducing agents such as carboxymethyl cellulose (CMC), [20] glucose, [21] ascorbic acid, [19] etc. or by increasing the temperature [22,23] or by using another reducing agent along with the alginate.…”

Cytotoxic, Antimitotic, DNA Binding, Photocatalytic, H2O2 Sensing, and Antioxidant Properties of Biofabricated Silver Nanoparticles Using Leaf Extract of Bryophyllum pinnatum (Lam.) Oken

“…Despite, its exposure in industrial processes results in various human health risks and environmental issues because of having toxic effects (Tagad et al, 2013 ). As per US-EPA, it is detrimental to human and aquatic bodies above permissible limit of 30 PPM in potable water (Bhagyaraj and Krupa, 2020 ). Therefore, a sensitive, accurate and easy detection method for H 2 O 2 contaminants is highly required.…”

A Highly Efficient Ag Nanoparticle-Immobilized Alginate-g-Polyacrylonitrile Hybrid Photocatalyst for the Degradation of Nitrophenols

“…The FTIR spectrum of sodium alginate ( Figure 1 a) shows peaks at 3411 cm −1 (–OH stretching), 2945 cm −1 (aliphatic –CH 2 stretching), 1614–1420 cm −1 (symmetric and asymmetric –COO − stretching), and 1012 cm −1 (pyranoid C–O–C stretching) [ 30 ]. The FTIR spectrum of the Alg@Ag NPs ( Figure 1 b) contains a peak at 575 cm −1 that corresponds to the Ag–O coordination bond, whereas the peak at 3430 cm −1 is due to –OH stretching and C=O bond stretching is evident in the peak at 1644 cm −1 [ 31 ]. The spectrum of PAN ( Figure 1 c) exhibits a wide sharp peak at 3450 cm −1 that is attributed to –OH groups due to humidity; the peak at 2246 cm −1 confirms the presence of nitrile groups (–C=N); peaks are noted at 1449–1624 cm −1 (–CH and –CH 2 vibrations), 1061 cm −1 (–C–CN bond stretching), and 2926 cm −1 (stretching vibration of the –CH 2 group of the PAN chain) [ 32 ].…”