IFEG   20353
INSTITUTO DE FISICA ENRIQUE GAVIOLA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Electrodos de poli(3-metiltiofeno)/nanotubos de carbono de pared múltiple
Autor/es:
MARÍA DEL CARMEN AGUIRRE, BERNABÉ.L RIVAS ,CARLOS PEÑA FARFAL.
Lugar:
Pto Iguazu-Misiones
Reunión:
Congreso; Congreso Internacional en Ciencia y Tecnologia de Metalurgia y Materiales SAM/CONAMET2013; 2013
Institución organizadora:
Universidad Nacional de Misiones-CONICET -SAM-SOCHIM
Resumen:
Our goal, is focused in the synthesis of composite film electrodes used in the detection of contaminants from water. Films of poly(3-methylthiophene) (P3MT) were prepared by electropolymerization over glassy carbon electrode (= 3mm) and then impregnated with a thin dispersion of multi wall?carbon nanotubes, (MWCNT). Also, the MWCNT was directly embedded over the glassy carbon electrode. These composite materials P3MT/MWCNT and MWCNT coated onto a glassy carbon electrode (GC) are applied in electrochemical As(III) detection with different supporting electrolytes. The cyclic voltammetry of MWCNT/GC modified electrode showed As(III) irreversible anodic waves occurring at 0.9 to 1.3 V vs Ag/AgCl range, and lineal conduct up to 5-10 mmol L-1 As(III), and even reproducible results after it had been used for several times at highest concentrations. The P3MT/MWCNT/GC modified electrode, by anodic stripping voltammeter (ASV) in 0.1 mol L-1 Na2HPO4 (pH 10) solution showed a high performance, because the low potential 0.55 V vs Ag/AgCl due to As(III) anodic current peak and great stability upon As(III) addition. The electrolysis of As(III) at constant potential with MWCNT/Felt carbon macro electrode (= 8 mm) produced a 94 % of less toxic transformed form As(V).