Figure 21 Cyclic voltammograms showing effect of catalytic reduction of TCA by Mb in DMPC films at 0.1V/s and pH 5.5. Numbers on curves show TCA concentration in mM; dashed curve to the far right is for reduction of TCA on a DMPC-coated electrode without Mb. (Adapted with permission from Ref. 25. Copyright 1997 Elsevier.)

doi:10.1201/9780203908907-105

Chapter

Figure 21 Cyclic voltammograms showing effect of catalytic reduction of TCA by Mb in DMPC films at 0.1V/s and pH 5.5. Numbers on curves show TCA concentration in mM; dashed curve to the far right is for reduction of TCA on a DMPC-coated electrode without Mb. (Adapted with permission from Ref. 25. Copyright 1997 Elsevier.)

Chapter

ABSTRACT

Electrolysis of a series of organohalides was done using 20 µm Mb-DDAB films on rough PG electrodes of about 3 cm2 area [34]. TCA was reduced at −0.4 V versus SCE to

dichloroacetic, monochloroacetic, and acetic acids. Ethylene dibromide (EDB) was reduced at −0.5 V to ethylene. Trichloroethylene and tetra-

chloroethylene were reduced at −1.3 V to dichloroethylene. These reactions persisted for thousands of catalyst turnovers. Rate enhancements were found in the films compared to the chemical reactions in Mb solutions and were attributed mainly to preconcentration of the organohalides in the films.