Recycling of Expired drug (levofloxacin hemihydrate) as a potential Eco-friendly Inhibitor for Copper in Synthetic Acid Rain Solution (SAR)

Abstract

: This study focused on the recycling of the expired Levofloxacin hemihydrate (LFH) for preventing copper (Cu) corrosion caused by synthetic acid rain (SAR) solution employing electrochemical techniques potentiodynamic polarization (Tafel Polarization) and electrochemical impedance spectroscopy (EIS); and chemical method (weight loss (WL)). Results showed that LFH is an efficient inhibitor for copper corrosion, and the inhibition efficiency percent (η%) reached 88.4 % at an optimum concentration (600 ppm) according to EIS measurements. The data of WL method revealed that the inhibition efficiency (η%) raised and the corrosion rate (k corr ) decreased with the concentration of LFH and vice versa with the temperature. It was discovered that the adsorption of the LFH on the Cu surface obeyed Langmuir adsorption isotherm. The Tafel curves demonstrated that this expired behaved as a mixed-type inhibitor. The LHF prevented corrosion by adhering to the metal surface, which was demonstrated by Scanning Electron Microscopy Conducted with Energy Dispersive X-ray (SEM-EDX), Atomic Force Microscopy (AFM), and Fourier Transform Infrared Spectroscopy (FT-IR).