JHAZMAT 148-2007-1

Complete electrochemical dechlorination of chlorobenzenes
in the presence of naphthalene mediator

Electrochemical dechlorination of chlorobenzene in organic solutions was studied. Electrolysis of chlorobenzene in acetonitrile solution in a
one-compartment cell fitted with a platinum cathode and a zinc anode at 60 mA/cm2 and 0 ◦C was found to be the optimum conditions, which gave
complete dechlorination of chlorobenzene. However, similar result could not be achieved when applying these conditions to 1,3-dichlorobenzene
and 1,2,4-trichlorobenzene.We found that the use of naphthalene which reacted as a mediator in the appropriate system could accelerate the reduction
and gave complete dechlorination of those chlorobenzenes. Moreover, in the presence of naphthalene the reaction time could be shortened by half
compared to dechlorination in the absence of naphthalene.