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Type: Artigo de periódico
Title: Fad-modified Sio 2/zro 2/c Ceramic Electrode For Electrocatalytic Reduction Of Bromate And Iodate
Author: Marafon E.
Kubota L.T.
Gushikem Y.
Abstract: SiO 2/ZrO 2/C carbon ceramic material with composition (in wt%) SiO 2∈=∈50, ZrO 2∈=∈20, and C∈=∈30 was prepared by the sol-gel-processing method. A high-resolution transmission electron microscopy image showed that ZrO 2 and the graphite particles are well dispersed inside the matrix. The electrical conductivity obtained for the pressed disks of the material was 18 S cm -1, indicating that C particles are also well interconnected inside the solid. An electrode modified with flavin adenine dinucleotide (FAD) prepared by immersing the solid SiO 2/ZrO 2/C, molded as a pressed disk, inside a FAD solution (1.0∈×∈10 -3 mol L -1) was used to investigate the electrocatalytic reduction of bromate and iodate. The reduction of both ions occurred at a peak potential of -0.41 V vs. the saturated calomel reference electrode. The linear response range (lrr) and detection limit (dl) were: BrO 3 -, lrr∈=∈4.98∈×∈10 -5-1. 23∈×∈10 -3 mol L -1 and dl∈=∈2.33 μmol L -1; IO 3 -, lrr∈=∈4. 98∈×∈10 -5 up to 2.42∈×∈10 -3 and dl∈=∈1.46 μmol L -1 for iodate. © 2008 Springer-Verlag.
Rights: fechado
Identifier DOI: 10.1007/s10008-008-0564-9
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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