Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 185, Issue 1, Pages 255-261Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2010.09.026
Keywords
Cyanide; Wastewater; Square wave voltammetry; Silver hexacyanoferrate nanoparticles; Multiwall carbon nanotube; Modified electrode
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Funding
- University of Sistan & Baluchestan (USB) [87g09]
- Laboratory of Electron Microscopy of College of Science, University of Tehran
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The sensitive determination of cyanide in wastewaters using modified GC electrode with silver hexacyanoferrate nanoparticles (SHFNPs) immobilized on multiwall carbon nanotube (MWCNT) was reported. The immobilization of SHFNPs on MWCNT was confirmed by transmission electron microscopy (TEM). The TEM image showed that the SHFNPs retained the spherical morphology after immobilized on MWCNT. The size of SHFNPs was examined around 27 nm. The GC/MWCNT-SHFNPs was used for the determination of cyanide in borax buffer (BB) solution (pH 8.0). Using square wave voltammetry, the current response of cyanide increases linearly while increasing its concentration from 40.0 nM to 150.0 mu M and a detection limit was found to be 8.3 nM (S/N = 3). The present modified electrode was also successfully used for the determination of 5.01 mu M cyanide in the presence of common contaminants at levels presenting in industrial wastewaters. The practical application of the present modified electrode was demonstrated by measuring the concentration of cyanide in industrial wastewater samples. Moreover, the studied sensor exhibited high sensitivity, good reproducibility and long-term stability. (C) 2010 Elsevier B.V. All rights reserved.
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