Kinetics of the oxidative degradation of formaldehyde with electrogenerated hypochlorite ion

The mechanisms and kinetics of the anodic oxidation of chloride ion on SnO2-PdO-RuO2-TiO2/Ti (SPR) anode and the oxidation of formaldehyde with hypochlorite ion were studied, and the new kinetic data based on theoretical analysis were evaluated in this investigation. The reaction order of the anodic oxidation of chloride ion on SPR was unity. Also, the oxidation of formaldehyde with hypochlorite ion was second order in formaldehyde and first order in hypochlorite ion. Furthermore, the activation energy was evaluated as 37.9 kJ mol(-1). Formaldehyde was degraded from 3000 to 279 ppm, and the degradation fraction was 90.7% when the electrolysis time was 111 min. A model calculation of the in situ oxidative degradation of formaldehyde with electrogenerated hypochlorite ion correlated well with experimental results.