PREPARATION AND ELECTROCHEMICAL CHARACTER ISTIC OF MONTMORILLONITE CHEMICAL MODIFIED ELECTRODES

Montmorillonite chemical modified electrodes (CME) were prepared with certain cationic and anionic species absorbed in the montmorillonite f ilm by both pre-exchange and incorperation methods. The cationic and a nionic species absorbed exhibit different voltammetric response when t he CME immersed in solutions containing only supporting electrolyte. I f is found that only a small fraction of the absorbed species ia elect rochemically active. X-ray diffraction and spectrophotsmetry reveals t hat cationic species can intercalate into the interlamellar spaces to form a clay-organic complex. The electroactivity of the absorbed speci es was discussed based on the different absorbed sites available in mo ntmorillonite.