B. Rezaei, H. Khosropour, A.A. Ensafi,

This research attempted to develop a simultaneous, sensitive and low-cost electrochemical sensor 
for acid blue 29 (AB 29) and mordant yellow 10 (MY 10) determination which are textile dye pollutants in 
industrial waste waters. Therefore, the first electrochemical sensor has been developed for their 
simultaneous determination by modifying a glassy carbon electrode (GCE) with a composite consisting 
of 1-butyl-2,3- dimethylimidazolium hexafluorophosphate ([bmmim]PF6) 98% as an ionic liquid (IL) and 
carboxylated multiwalled carbon nanotubes (CMWCNTs). Direct electrochemical oxidation of AB 29 and 
MY 10 at the modified electrode showed two peak currents that were significantly improved due to the 
presence of the ionic liquid–carboxylated multiwalled carbon nanotube-glassy carbon electrode 
(IL/CMWCNT-GCE). The electrochemical signals improved due to the optimization of different 
parameters affecting the sensitivity such as pH, electrode composition, scan rate, accumulation 
potential and time. Individual and simultaneous determinations were performed by differential pulse 
voltammetry (DPV) under optimum conditions. The linear dynamic ranges of 0.10–25 mmol L-1, with a 
detection limit of 0.06 mmol L-1 for AB 29, and 0.6–30 mmol L-1, and a detection limit of 0.5 mmol 
L-1 for MY 10, were achieved. Finally, the proposed modified electrochemical sensor was utilized for 
individually and simultaneously detecting AB 29 and MY 10 in wastewater samples.