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A B S T R AC TThis work investigated the electrocatalytic degradation of three types of textile dyes by electrochemical oxidation on lead dioxide anode. The infl uence of pH, current density, time of electrolysis, temperature, the conductive salt concentration and the initial dye concentrations were critically examined. The results of these infl uences are expressed in terms of the remaining organic compounds concentrations (color removal) and Chemical Oxygen Demand (COD removal). Also, both of the current effi ciency and power consumption values are calculated. In this manuscript we report that, the highest electrocatalytic activity was achieved in the presence of NaCl (3 g/l), 30 mA/cm 2 , pH of 3 and temperature of 30 °C. The highest electroactivity could be attributed to indirect oxidation of the investigated dyes by the electrogenerated hypochlorite ions formed from the chloride oxidation. In addition, contribution from direct oxidation could also be possible via reaction of these dyes with the electrogenerated hydroxyl radicals adsorbed on the lead dioxide surface.

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The inhibitive action of azo dye aminophenol derivatives, namely 6-(4-benzenesulfonic acid azo)-3-aminophenol (compound (1)) and 4-(2,3-dimethyl-1-phenylpyrazol-5-one azo)-3-aminophenol (compound (2)) against the corrosion of C-steel in 2 M HCl solution using Tafel polarisation, surface morphology, electrochemical impedance spectroscopy and electrochemical frequency modulation techniques. The inhibition efficiency increased with increasing inhibitor concentrations and decreased with increasing temperature. Tafel polarization curves showed that the corrosion rate was decreased with increasing compounds concentration into HCl solution. Inhibition efficiency values obtained from various methods employed were in reasonable agreement. It was found that the order of percentage IE of these investigated compounds obey the following order: compound (2) > compound (1). In addition, the antimicrobial and antifungal activities of the aminophenol derivatives compounds (1 and 2) and comparing them with the standard antibacterial and antifungal drugs were described. The results showed that the compound (2) is very good antibacterial agents against Bacillus subtilis and Staphylococcus aureus. The compound (2) is more active than the compound (1) and penicillin G against Bacillus subtilis and Staphylococcus aureus. It was found that the compound (2) is more active than penicillin G which is used as the antibacterial standard drug against Enterobacter sp. and Klebsiella pneumoniae. Molecular docking was used to predict the binding between aminophenol derivatives compounds (1 and 2) and the receptors of the crystal structure of Staphylococcus aureus (3q8u) and the crystal structure of Escherichia coli (3t88). The compound (2) showed best interaction with receptor of Staphylococcus aureus (3q8u) than the compound (1).

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