Investigation on Electrogenerated Active Chlorine from diluted NaCl Solutions at Ti/Pt Anode

Electrogeneration of active chlorine from diluted NaCl solutions was investigated in an undivided cell with Ti/Pt anode and Ti plate cathode.The effects of electrolysis time,current density(i),chloride concentration and pH value on the electrogeneration of active chlorine and current efficiency(CE) were analyzed.Meanwhile,the changing trends of the electrolyte's conductivity(TSD) and pH value in the electrolysis process were discussed.The results showed that the concentration of active chlorine increased with electrolysis time,but the trend became slow.During this process,the current efficiency reduced steadily.When i was 4.93～7.39 mA/cm2,the concentration of active chlorine increased with the increase of i,but no longer increased when the i exceeded 7.39 mA/cm2.The concentration of active chlorine and CE increased with the increase of NaCl concentration,but the increased range reduced.Acidic electrolyte was beneficial to electrogeneration of active chlorine.During the electrolysis,the TSD decreased steadily and the change of pH value did not exceeded 1.