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The phenolic compounds are a group of organic molecules whose massive industrial use has produced the contamination of aquatic and terrestrial ecosystems, being classified as one of the primary pollutants to degrade. Laccases enzymes are very stable, have an isoelectric point (Pi) between 2.6 and 4.5 and their maximum activity varies in a wide range of pH, between 2.0 and 8.5. In this work the results for the degradation of the compound 4-Nitrophenol (4-NF) are presented by means of cyclic voltammetry, using a sensor based on the immobilization by adsorption of the Lacasa enzyme "Myceliophthota Thermophila" on carbon paste electrodes and by UV-Vis spectroscopy.

In this paper we present the electrochemical characterization of 5-Amino 1,10 Phenanthroline (5-Aphen) and its complex with Fe (III); polymer films, supported on ITO. The films of 5-Aphen and Fe (III)-5-Aphen were prepared using the technique of cyclic voltammetry (CV) on a substrate of ITO. These were characterized using spectroscopic and electrochemical techniques. Spectroscopic techniques used: Fourier transform infrared (FT-IR), X-ray diffraction (EDX) were are able to confirm the incorporation of the metal ion to the polymer matrix.

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The electrocatalytical behaviour of carbon paste electrode modified with poly Fe(III)-5-Aphen (MCPE) were studied for the oxygen electroreduction reaction (ORR) in acid medium. The ORR on the MCPE follows a mechanism via 4 electrons. Electrokinetic parameters obtained in this work are comparable with those reported for other metallic porphyrins and phthalocyanines used as electrocatalyst. The stability of the MCPE in the ORR is maintained at least for 30 days after been prepared. Only after this time there is a slight modification of the electrode surface with an increase of 50 mV in the cathodic overpotencial for ORR.