Adsorptive Fe-nanoparticles mediated by Musa sapientum peels extract as anticorrosion additive for aqueous oilfield descaling solution

Banana (Musa sapientum) peel is a biodegradable and non-toxic agricultural waste that can be readily and sustainably obtained. Its ethanolic extract was used to mediate the synthesis of nanoparticles using iron (ii) chloride (FeCl2) and investigated as anticorrosive additive for mild steel in laboratory simulated descaling solution. The essence was check if improved efficiency could be obtained by reducing the crude extract to nanoparticles. Thermogravmetric and electrocanalytical techniques were used to determine the inhibition efficiency. Results reveal that 10 mL Musa sapientum extract-iron oxide nanoparticle (Fe-MSE Nano) was 94.4% efficient compared to the crude extract which was 72.1% efficient in 1.0 M HCl corroding solution at 30 °C. Charge transfer resistance from impedance measurements increases as concentration of nanoparticle per volume of descaling solution increases owing to adsorption of molecules of the composites. Fe-MSE Nano acts as mixed type inhibitor, predominantly inhibiting anodic oxidation reaction. The steel surface was found to be morphologically smoother than without the Fe-MSE Nano as observed by scanning electron microscopy (SEM). Adsorption behavior of the major compound in the peels extract, bananadine, was modeled theoretically on Fe(1 1 1) surface using density functional theory. Theoretical parameters such as frontier molecular orbitals energies, rigid adsorption energy, and deformation energy were calculated. Fukui analysis and Forcite neutron scattering analysis were also performed and nitrogen site (N8) is predicted as the active adsorption site. Based on results obtained, Fe-MSE Nano would make a more efficient anticorrosive additive for steel in oilfield descaling solution than the crude extract.