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|Type:||Artigo de periódico|
|Title:||A Novel Sensor Based On Manganese Azo-macrocycle/carbon Nanotubes To Perform The Oxidation And Reduction Processes Of Two Diphenol Isomers|
De Cassia SilvaLuz R.
|Abstract:||The present work describes the development of a selective and sensitive voltammetric sensor for simultaneous determination of catechol (CC) and hydroquinone (HQ), based on a glassy carbon (GC) electrode modified with manganese phthalocyanine azo-macrocycle (MnPc) adsorbed on multiwalled carbon nanotubes (MWCNT). Scanning electron microscopy and scanning electrochemical microscopy were used to characterize the composite material (MnPc/MWCNT) on the glassy carbon electrode surface. The modified electrode showed excellent electrochemical activity towards the simultaneous oxidation and reduction of CC and HQ. On the MnPc/MWCNT/GC electrode, both CC and HQ can generate a pair of quasi-reversible and well-defined redox peaks. Under optimized experimental and operational conditions, the cathodic peak currents were linear over the range 1-600μmolL-1 for both CC and HQ, with limits of detection of 0.095 and 0.041μmolL-1, respectively. The anodic peak currents were also linear over the range 1-600μmolL-1 for both CC and HQ, with limits of detection of 0.096 and 0.048μmolL-1, respectively. The proposed method was effectively applied for the simultaneous detection of hydroquinone and catechol in water samples and the results were in agreement with those obtained by a comparative method described in the literature. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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