The electrochemical degradation of linearalkylbenzenesulfonate (LAS) on platinum electrode

The electrochemical behaviour of linearalklybenzenesulfonate (LAS) on Pt electrode has been investigated in 0.05 M Na2SO4 and in 0.1 M NaCl at pH=8 by potentiokinetic method and by electrolysis. The anodic and cathodic semilogarithmic current-potential curves were obtained between −1.6 V−+1.6 V. The experimental discharge potentials (Eexp.) have been determined by means of current-potential curves obtained by electrolysis method between 0–3 V. The percentages of surface active material remaining in solution after specified time periods (0–6 h) were determined for different initial concentrations of LAS (30, 150, 300 ppm) by using the potentiostat (+1.6 V) and by applying constant potentials of 20 V via a direct current source. The concentrations of LAS in solution was determined by UV spectrophometer. Results indicate that when a potential of 20 V is applied on the electrodes the concentrations of surface active materials (LAS) decreases by 40–50% at the end of 6h in 0.05 M Na2SO4 solution.