Degradation and Mineralization of Metformin by Electro-Oxidation on Ti/DSA (Ta۲O۵-Ir۲O۵) Anode and Combined Electro-Oxidation and Electro-Coagulation on Stainless Steel (SS) Anode

We conducted electro-oxidation, and combined electro-oxidation and electro-coagulation batch experiments on synthetic wastewater containing an anti-diabetic drug metformin hydrochloride (MET-HCl). Degradation and mineralization were studied on Ti/DSA (Ta۲O۵-Ir۲O۵) and stainless steel (SS) anodes. Electrochemical behavior was observed by cyclic voltammetry techniques. The effect of applied current density was evaluated at ۵۰ ppm concentration of supporting electrolyte sodium sulphate (Na۲SO۴). Electro-oxidation on Ti/DSA anode resulted in maximum degradation of ۹۴.۸۸% at the corresponding specific charge (Q) of ۲.۱ Ah/L, current density of ۰.۹۳ mA/cm۲ and Na۲SO۴ concentration of ۱۰۰ ppm. Similarly, maximum mineralization obtained was ۷۰.۶۴% at corresponding specific charge (Q) of ۲.۱ Ah/L, current density of ۰.۹۳ mA/cm۲ and Na۲SO۴ concentration of ۵۰ ppm. Energy consumption was ۲۰۸۱.۵۶ kWh/kgTOC. Further, under identical conditions, combined electro-oxidation and electro-coagulation on SS anode resulted in maximum degradation of ۹۹.۴۸% at corresponding specific charge (Q) of ۲.۱ Ah/L, current density of ۰.۹۳ mA/cm۲ and Na۲SO۴ concentration of ۱۰۰ ppm. Similarly, maximum mineralization obtained was ۹۹.۰۴% at corresponding specific charge (Q) of ۲.۱ Ah/L, current density of ۰.۹۳ mA/cm۲, and Na۲SO۴ concentration ۷۵ ppm. Energy consumption was ۸۷۰.۹۸ kWh/kgTOC.

کلیدواژه ها:

Metformin hydrochloride ، Electro-oxidation ، Electro-coagulation ، Degradation ، Mineralization ، energy consumption ، Mineralization current efficiency