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Ionics

, Volume 24, Issue 8, pp 2489–2498 | Cite as

Voltammetric sensing of nitrite in aqueous solution using titanium dioxide anchored multiwalled carbon nanotubes

  • Mambo Moyo
  • Prince Mudarikwa
  • Munyaradzi Shumba
  • Jonathan O. Okonkwo
Original Paper

Abstract

A glassy carbon electrode modified with TiO2 anchored on multiwalled carbon nanotube particles was used for voltammetric determination of nitrite in phosphate buffer solution (pH 7). Characterization of modified electrodes was performed using transmission electron microscopy (TEM), energy dispersive X-ray spectrometer (EDS), and voltammetric techniques. Under optimal conditions, TiO2/MWCNT/GCE reduced oxidation potential by 250 mV and enhanced i pa by 2.7-fold (≈ 172%) higher when compared with bare glassy carbon electrode. A linear voltammetric response from 0.02 to 600 μM with a detection limit of 0.011 μM (s/n = 3) was obtained using DPV. The apparent diffusion coefficient for nitrite was calculated to be 2.15 × 10−6 cm2 s−1. The fabricated sensor was used for the determination of nitrite in water samples and the results were consistent with the values obtained by the ultraviolet–visible spectroscopy (UV-Vis) method.

Keywords

Nitrite Nano TiO2 Multiwalled carbon nanotube Voltammetry 

Notes

Acknowledgments

The authors would like to acknowledge laboratory facilities from Midlands State University, Gweru, Zimbabwe.

Compliance with ethical standards

Conflict of interest

The authors declare that have no conflict of interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2017

Authors and Affiliations

  • Mambo Moyo
    • 1
  • Prince Mudarikwa
    • 1
  • Munyaradzi Shumba
    • 1
  • Jonathan O. Okonkwo
    • 2
  1. 1.Sensor Laboratory Research Group, Department of Chemical TechnologyMidlands State UniversityGweruZimbabwe
  2. 2.Department of Environmental, Water, and Earth SciencesTshwane University of TechnologyPretoriaSouth Africa

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