Carbon steel corrosion inhibition activity of tofu associated proteins. (February 2022)

• Record Type: Journal Article
• Authors: Zunita, Megawati; Wahyuningrum, Deana; Wenten, I. Gede; Boopathy, Raj
• Is Part Of: Bioresource technology reports. Volume 17(2022)
• Publication Date: 2022-02
• Subjects: Tofu pulp -- Isolated protein -- Corrosion inhibitor -- Brackish water -- Carbon steel; Biomass energy -- Periodicals; Biotransformation (Metabolism) -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Waste products as fuel -- Periodicals; Waste products as fuel; Organic wastes; Factory and trade waste; Biotransformation (Metabolism); Biomass energy; Agricultural wastes; Periodicals; Electronic journals; 662.88
• DOI: 10.1016/j.biteb.2022.100973
• Languages: English
• ISSNs: 2589-014X

Abstract

Abstract: Green corrosion inhibitors are required to reduce the rate of corrosion on metal surfaces. Proteins have specific functional sites for amino acids that can be used to inhibit corrosion. In this research, protein and its amino acids, isolated from tofu pulp, were evaluated as corrosion inhibitors in brackish water media using electrochemical impedance spectroscopy method. The inhibition efficiency (IE %) of isolated protein in fraction 3 was found to be 92% at 80 ppm. Glycine, methionine, proline, threonine, and tryptophan were found in the isolated protein content in fraction 3. The isolated protein's adsorption isotherm mechanism on the carbon steel surface follows the Langmuir isotherm with ∆ G ads of −33.5 kJ/mol. Semi-chemical or physical adsorption was observed between isolated protein as a corrosion inhibitor and metal surfaces. Graphical Abstract: Unlabelled Image Highlights: Tofu-associated protein has been identified as a possible green corrosion inhibitor. Maximum corrosion inhibitory efficiency of 92% was observed. Isolated protein exhibited semi-chemical or physical adsorption to metal surfaces.