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Electrocatalytic Oxidation and Voltammetric Determination of Nitrite on Hydrophobic Ionic Liquid‐Carbon Nanotube Gel‐Chitosan Composite Modified Electrodes
Author(s) -
Xiao Fei,
Liu Liqin,
Li Jun,
Zeng Junjie,
Zeng Baizhao
Publication year - 2008
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.200804288
Subject(s) - ionic liquid , cyclic voltammetry , carbon nanotube , dielectric spectroscopy , materials science , scanning electron microscope , nitrite , detection limit , electrode , amperometry , nuclear chemistry , electrochemistry , chemical engineering , inorganic chemistry , analytical chemistry (journal) , chemistry , chromatography , nanotechnology , composite material , organic chemistry , nitrate , catalysis , engineering
A novel room temperature ionic liquid (i.e., 1‐octyl‐3‐methylimidazolium hexafluorophosphate, OMIMPF 6 )‐multiwall carbon nanotube (MWNT) gel‐chitosan (Chi) composite modified glassy carbon electrode (GCE) was fabricated and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), infrared spectroscopy (IR), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV). The OMIMPF 6 ‐MWNT gel‐Chi composite showed good conductivity, stability, and extraction effect due to the synergic action of OMIMPF 6 , MWNT, and Chi. Furthermore, it was found that the OMIMPF 6 ‐MWNT gel‐Chi composite had strong electrocatalytic effect on the oxidation of nitrite and at the OMIMPF 6 ‐MWNT gel‐Chi/GCE nitrite could produce a very sensitive anodic peak. Under optimized conditions, the peak current was linear to nitrite concentration from 2.0×10 −8 to 6.0×10 −5 M. The detection limit was 1.0×10 −8 M. The electrode also exhibited acceptable stability, repeatability and selectivity. It was used successfully for the determination of nitrite in soil, sewage and sausage samples.