Abstract
In this work, cobalt hydroxide (Co(OH)2) is electrodeposited on glassy carbon electrode (GCE) modified by hydroxylated multiwalled carbon nanotubes (MWCNTs-OH). The obtained electrode (Co(OH)2/MWCNTs-OH/GCE) is utilized to determine 4-nitrochlorobenzene (4-NCB). The as-prepared materials are characterized through scan electron microscope, energy-dispersive spectroscopy, X-ray diffraction and X-ray photoelectron spectroscopy to analyze crystal structure, morphology, element composition and distribution. The electrochemical behaviors of 4-NCB on modified electrodes and GCE are investigated via cyclic voltammetry (CV) and AC impedance. CV curves and Nyquist plots show that the electrochemical properties of Co(OH)2/MWCNTs-OH/GCE are significantly better than the others. Differential pulse voltammetry tests demonstrate that Co(OH)2/MWCNTs-OH/GCE possesses great electrocatalytic activity for determining 4-NCB in the range of 0.01 ∼ 400 μM, and the detection limit is 6.5 nM (S/N=3). Additionally, the constructed sensor exhibits excellent reproducibility, stability and selectivity. Moreover, recovery experiment using the standard addition method is conducted on tap water, yielding satisfactory recovery rates.
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