THE ELECTROCHEMICAL-BEHAVIOR OF CATIONIC AND ANIONIC DYE-CLAY MODIFIED ELECTRODES

Cationic dye clay modified electrodes and anionic dye clay modified el ectrodes showed different electrochemical behavior. Catonic dye clay m odified electrodes prepared by a one step method did not exhibit volta mmetric response while the anionic dye clay modified electrodes did. X -ray diffraction and spectrophotometric experiments suggested that mos t of the cationic dye adsorbed in interlamellar space charged negative ly and strongly interacted with the clay. However, anionic dye did not enter the interlamellar space due to electrostatic repulsion and had no strong interaction with the clay.