IN-SITU DEGRADATION OF FORMALDEHYDE WITH ELECTROGENERATED HYPOCHLORITE ION

The oxidant ClO- was generated on an SPR (SnO2-PdO-RuO2-TiO2) anode an d used to degrade formaldehyde in aqueous solution. The current effici ency of the production of hypochlorite ion was significantly affected by the concentration of chloride ion, pH and stirring rate. The effect of current density and temperature on the current efficiency for elec trogeneration of hypochlorite ion was slight. The maximum anodic curre nt efficiency was 99.3% when 100 C was charged. Increasing the concent ration of chloride ion, pH, temperature, stirring rate and the concent ration of formaldehyde in the solution and decreasing the current dens ity and charge passed resulted in increased current efficiency of degr adation of formaldehye with electrogenerated hypochlorite ion.