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A Novel Sensor Based on Manganese azo‐Macrocycle/Carbon Nanotubes to Perform the Oxidation and Reduction Processes of Two Diphenol Isomers
Author(s) -
Silva Saimon Moraes,
de Oliveira Fernando Mota,
Justino Danielle Diniz,
Kubota Lauro Tatsuo,
Tanaka Auro Atsushi,
Damos Flavio Santos,
de Cássia Silva Luz Rita
Publication year - 2014
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201300576
Subject(s) - hydroquinone , redox , glassy carbon , catechol , electrochemistry , electrode , carbon nanotube , phthalocyanine , electrochemical gas sensor , materials science , detection limit , scanning electron microscope , manganese , adsorption , inorganic chemistry , cyclic voltammetry , chemistry , analytical chemistry (journal) , nanotechnology , organic chemistry , chromatography , composite material , metallurgy
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 1–600 µmol L −1 for both CC and HQ, with limits of detection of 0.095 and 0.041 µmol L −1 , respectively. The anodic peak currents were also linear over the range 1–600 µmol L −1 for both CC and HQ, with limits of detection of 0.096 and 0.048 µmol L −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.