Abstract
An alternative green approach through which nanoscience/nanotechnology could be applied in the industry is being demonstrated in this study. Ethanol extracts of Allium cepa peels (Et-ACPE) is used to mediate the synthesis of silver nanoparticles (Et-AgNPs) at room temperature. Stable crystalline, monodisperse and non-agglomerated spherical NPs with zeta potential of −46.2 ± 0.1 mV and plasmon absorption at 435 nm are obtained. Silver atoms are predominantly oriented towards the Ag (111) plane in a face centered cubic structure with a = b = c = 4.0968 Å having alpha = beta = gamma = 90^circ. The surfaces of the NPs becomes rich in electron cloud due to O atoms supplied by capped phyto-compounds of Et-ACPE. This enhances adsorption potential and more efficient inhibition (up to 90% at 30 °C) of X80 steel corrosion in 1 M HCl solution than using the crude extract. Investigation of corrosion products and morphologies of the steel surface by FTIR, SEM/EDS and AFM techniques reveals efficient surface protection through adsorption of Et-AgNPs facilitated mainly by O and –C = C– sites. Findings prove that the Et-AgNPs is a more efficient and thermally stable alternative ecofriendly anticorrosion additive for industrial cleaning and pickling operations than the crude extract.
Highlights
Hydrochloric acid (HCl) is an important inorganic acid that has been extensively used as industrial cleaning solution
We explore future research horizon in corrosion protection using plant extract mediated nanoparticles (PEMN) especially considering that there is a wide variety of plant materials which could be investigated
By using silver ions as capping agent and Allium cepa peels extract (ACPE) as catalyst, the present study aims to achieve improved efficiency
Summary
Hydrochloric acid (HCl) is an important inorganic acid that has been extensively used as industrial cleaning solution. AgNPs have been established to exhibit antiprotozoal, antibacterial, antifungal and anticancer activities [17,18,19,20,21] This has been attributed to slightly toxic nature of silver ions to the target. PEMN with anticorrosion activity was recently reports by Essien and co-workers [19] and Idrees and co-workers [20] They used olive leaves [19] and Sida acuta [20] extracts as feedstock for fabrication of titanium and silver nanoparticles composites, respectively. The present study builds on these foundation reports and in addition provides/documents further insights on the optical/crystalline properties, adsorption behaviour and corrosion inhibition effects of PEMN
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