Plasma degradation of Cationic Blue dye with contact glow discharge electrolysis

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Contact glow discharge electrolysis (CGDE) of Cationic Blue SD-GTL (CB) was investigated by determining degradation rates and rate constants under different voltages, pH, temperature and initial concentrations. The results indicated that 500 V was the optimum voltage for CGDE of CB under experimental conditions. The effect of pH was not appreciable. Fe2 +  and Fe3 +  had a remarkable catalytic effect on the degradation of CB. The degradation rate was up to 99.7% after 3 minutes CGDE treatment when the concentration of Fe2 +  was 20.0 mg/L. And when the concentration of Fe3 +  was 5.0 mg/L, the degradation rate was only 68.6% after 10 minutes CGDE treatment. The reaction mechanisms were also well illustrated by relative reactions and their rate constants. It had been demonstrated that CB underwent oxidative degradation in CGDE.

Keywords: cationic blue SD-GTL (CB), contact glow discharge electrolysis, degradation, dye, plasma

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