Adsorption Behavior and Anticorrosion Capability of Antibiotic Drug Nitroxoline on Copper in Nitric Acid Medium

• Published in: Journal of bio- and tribo-corrosion 2017-09, Vol.3 (3), p.1-13, Article 36
• Main Authors: Ganapathi Sundaram, R., Vengatesh, G., Sundaravadivelu, M.
• Format: Article
• Language: English
• Subjects: Adsorption; Antibiotics; Biomaterials; Charge transfer; Chemistry and Materials Science; Copper; Corrosion; Corrosion and Coatings; Corrosion inhibitors; Corrosion prevention; Electrochemical impedance spectroscopy; Gravimetry; Linear polarization; Materials Science; Nitric acid; Polarization; Solid Mechanics; Spectroscopy; Surface chemistry; Tribology
• ISSN: 2198-4220; 2198-4239
• DOI: 10.1007/s40735-017-0097-9

The adsorption performance and anticorrosion activity of nitroxoline (NHQ) on copper were evaluated by gravimetric method in 1.0, 2.0 and 3.0 M nitric acid solutions and by electrochemical techniques namely electrochemical impedance spectroscopy (EIS), Tafel polarization (TP) and linear polarization (LP) in 1.0 M nitric acid solution. In all four methods, it was observed that the percentage of inhibition efficiency increases with increasing inhibitor concentration from 50 to 300 ppm. TP curves indicate that the antibiotic drug NHQ acts as mixed-type inhibitor. EIS studies showed that the charge transfer resistance increases with inhibitor concentration. The thermodynamic parameter Δ G ads 0 confirmed a physisorption mechanism. The inhibitor adsorption was spontaneous and it obeyed Langmuir adsorption isotherm. The formation of adsorbed layer on the copper metal surface was confirmed by SEM, EDX, FT-IR and AFM techniques.