Hp. Zhang et Jf. Rusling, ELECTROCATALYSIS IN ORGANIZED MEDIA .12. PRECONCENTRATION AND CATALYSIS IN REDUCTION OF ALIPHATIC ORGANOHALIDES USING SURFACTANT-COATED ELECTRODES, Talanta, 40(5), 1993, pp. 741-747
Voltammetric reductions of several organohalide pollutants in films of
didodocyldimethylammonium bromide (DDAB) and clay-DDAB cast onto pyro
lytic graphite electrodes were examined. Direct reduction data show th
at the amount of accumulation in these liquid crystal films was larger
for relatively nonpolar analytes such as trans-1,2-dibromocyclohexane
than for chlorinated acids. The vicinal dibromides are probably taken
up by hydrophobic regions of the films. Chlorinated acids were accumu
lated and reduced in DDAB films, but their direct reduction was partly
blocked by the clay-DDAB films. Catalytic reductions using films cont
aining metal phthalocyanines had good efficiencies for all substrates
studied and shifted reduction potentials positive by 200-550 mV.