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. 2021 Nov 20;26(22):7024. doi: 10.3390/molecules26227024

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Adsorption isotherm from EIS plots for Harmal extract concentrations (ppm) on C-steel in 0.25 M H₂SO₄ medium: (a) Langmuir model, (b) Temkin model, and (c) Frumkin model.

Adsorption isotherm from EIS plots for Harmal extract concentrations (ppm) on C-steel in 0.25 M H₂SO₄ medium: (a) Langmuir model, (b) Temkin model, and (c) Frumkin model.