Eco-friendly disposal of expired anti-tuberculosis drug Isoniazid and its role in the protection of metal

This study reported results obtained from electrochemical impedance spectroscopy (EIS), polarization measurement, and weight loss, scanning electron microscopy equipped with energy dispersive x-ray analysis (SEM-EDX), atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). The experimental results were excellently complemented with the results obtained from density functional theory, i.e. DFT and molecular dynamics, i.e. MD. These hydrazones inhibited corrosion by adsorbing themselves on the metal surface which was confirmed by SEM-EDX and XPS results. All the synthesized inhibitors showed appreciable efficiency (> 90%) against corrosion of mild steel in 1 M HCl medium. The activation energy increased by the presence of inhibitors (76.1, 79.8, 77.3, and 67.0 kJ mol-1 for IICH, ICCH, IBCH, and IMCH respectively) compared to that in 1 M HCl solution only (32.8 kJ mol-1). All these compounds were found to act as a mixed type of inhibitor as confirmed by shifting range of corrosion potential (30 mV, 35 mV, 18 mV, and 36 mV for IICH, ICCH, IBCH, and IMCH respectively).Graphical abstract
Source: Journal of Environmental Chemical Engineering - Category: Chemistry Source Type: research