Evaluation of the Inhibitive Properties of Silver Nanoparticles in Senna occidentalis Root Extract as Corrosion Inhibitor of Mild Steel

Authors

Victor O. Egbeneje, Department of Chemistry, Benue State University, P. M. B 102119, Makurdi, KM 1, Gboko Road, Benue State, NigeriaFollow
Samuel E. Okhale, Department of Medicinal Plant Research and Traditional Medicine, National Institute for Pharmaceutical Research and Development (NIPRD), Abuja, NigeriaFollow
Chinyere Imoisi, Department of Industrial Chemistry, Mewar International University, KM 21 Abuja-Keffi Road, Nasarawa State, NigeriaFollow
Isaac O. Ogbogo, Department of Chemistry, Benue State University, P. M. B 102119, Makurdi, KM 1, Gboko Road, Benue State, NigeriaFollow
Omolade Ojo, Department of Chemistry, Federal College of Education, Gombe State, NigeriaFollow

Section

Physical Sciences

Abstract

The use of nanoparticles as corrosion inhibitors has gained popularity because of its increased corrosion efficiency due to increase surface to volume ratio. Nanoparticles which undergo physisorption/chemisorption to the corrosion metal surface and inhibit the corrosion efficiently also have low toxicity, low cost and easy production. In this research work, weight lost method was applied to study the inhibitive properties of silver nanoparticles (AgNPs) synthesized using Senna occidentalis root extract as environmentally benign corrosion inhibitor of mild steel in 0.5 M H2SO4 medium at 298 K and 308 K. It was observed that the corrosion rate of the steel sample decreases with increase in concentration of the silver nanoparticles but increased with rise in temperature.  The highest inhibition efficiency of 65.59% was obtained at 308 K at the concentration of 5 gdm-3 and the least of 10.58% at the concentration of 1 gdm-3 at 308 K. The decrease in inhibition efficiency with rise in temperature is suggestive of physical adsorption mechanism. The surface coverage was observed to increase with increasing concentration of the nanoparticles and decreased with increase in temperature. This could be as a result of physical adsorption mechanism. The evaluated activation energy was found to be higher for the inhibited process than for the uninhibited process. The increase in apparent activation energy in the presence of the nanoparticles denotes physical adsorption mechanism, while the reverse is usually attributed to chemical adsorption. The negative values of heat of adsorption Qads suggest that the adsorption phenomenon is exothermic.

Recommended Citation

Egbeneje, Victor O.; Okhale, Samuel E.; Imoisi, Chinyere; Ogbogo, Isaac O.; and Ojo, Omolade (2023) "Evaluation of the Inhibitive Properties of Silver Nanoparticles in Senna occidentalis Root Extract as Corrosion Inhibitor of Mild Steel," Tanzania Journal of Science: Vol. 49: Iss. 3, Article 9.
Available at:https://doi.org/10.4314/tjs.v49i3.9