Electro-Fenton (EF) oxidation of salicylic acid (SA) from an aqueous solution was studied in a continuous stirred tank reactor with the purpose of optimizing the process parameters on a laboratory scale. A laboratory-scale continuous-flow rectangular reactor, with a predetermined 3 L liquid volume of SA in the reactor, was used for this study. Electrolytic reactions carried out for 100 mg/L of SA solution, the parameters of catalyst concentration, pH, voltage, flow rate (residence time), and electrode spacing were varied. Electrolysis was carried out for a period of 10 h to optimize these parameters. A maximum of 70% oxidation was obtained at an initial Fe2+ concentration of 5 mg/L, pH of 2.5, voltage of 2.5 V, flow rate of 10 mL/min, and electrode spacing of 3 cm, after 10 h of electrolysis. Results obtained show the feasibility of this continuous EF process for the oxidation of SA.
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