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A High Performance Electrochemical Sensor for Pb 2+ Ions Based on Carbon Nanotubes Functionalized CoMn 2 O 4 Nanocomposite
Author(s) -
Bashir Nagina,
Akhtar Mehwish,
Nawaz Hafiza Zahra Rab,
Warsi Muhammad Farooq,
Shakir Imran,
Agboola Philips O,
Zulfiqar Sonia
Publication year - 2020
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202001393
Subject(s) - nanocomposite , materials science , electrochemical gas sensor , carbon nanotube , stripping (fiber) , detection limit , electrochemistry , anodic stripping voltammetry , electrode , adsorption , metal ions in aqueous solution , potassium ferrocyanide , ferrocyanide , analytical chemistry (journal) , fourier transform infrared spectroscopy , chemical engineering , inorganic chemistry , metal , nanotechnology , chemistry , composite material , chromatography , metallurgy , engineering
An efficient electrochemical sensor for the trace level detection of heavy metal ion (Pb 2+ ) was successfully developed using carbon nanotubes functionalized CoMn 2 O 4 nanocomposite. The structural and morphological studies of prepared nanocomposite were confirmed by means of XRD, FTIR, FESEM and EDX analyses. Electrochemical properties were investigated by means of EIS and CV studies using standard potassium ferrocyanide as a redox couple while the stripping behaviour of fabricated electrode was determined by square wave anodic stripping voltammetry (SWASV). Effect of various parameters such as deposition potential, stripping medium and deposition time were analyzed to have best detecting response on modified electrode. The designed sensor exhibited excellent sensitivity, selectivity, stability along with good reproducibility for the detection of lead ions which can be ascribed to the integrated high adsorption capacity of CoMn 2 O 4 and large surface area of carbon nanotubes. A linear relationship between current response and lead ion concentrations was obtained in the range from 0.01 μM to 0.85 μM with a detection limit of 0.004 μM. Moreover, the developed sensor was not much affected by the presence of other foreign species. From these results, it is expected that the developed sensor can be applied for detection of various organic, metallic and organometallic environmental toxins with slight modification.