MWCNT-NH2/Nanosilica/RTIL/Ionophore Nanocomposite Carbon Paste Electrode For Nd(III)

International Journal of Electrochemical Science

Volume 7 - Number

Article Type: ---- Unspecified ----
Abstract:

Given the results of our previous studies indicating a relatively strong interaction between 2-{[(6-aminopyridin-2-yl) imino] methyl}-phenol (APIMP) and Nd(III) ions, the ligand was incorporated, as the sensing material, into a nano-composite carbon paste electrodes which were prepared using functionalized multi-walled carbon nanotube (MWCNT-NH2), nanosilica (NS), graphite, and an room temperature ionic liquid namely 1-n-butyl-3-methylimidazolium tetrafluoroborate [bmim]BF4 (RTIL). The electrodes composed of 2%NS, 5% MWCNT-NH2, 20% APIMP, 20% RTIL, and 53% graphite powder were found to show the optimum behavior. The sensor shows a Nernstian response of (19.8+/-0.12 mV decade(-1)) in the concentration window of 1.0x10(-6)-1.0x10(-2) M with a detection limit of 8.0x10(-7) M. The response of the sensor was found to be stable in the pH of 4.0-8.0 and the nano-composite based Nd(III) sensors displayed good selectivity with respect to a number of lanthanide and transition metal ions as well as a rather long lifetime.