Multiwall Carbon Nanotube Modified Electrochemical Sensor for Reactive Black 5

Cyclic voltammograms of reactive black5 (RB5) at different pHs in the range 1.0- 13.0 on multiwall carbon nanotube modified glassy carbon electrode revealed the presence of one well-defined irreversible anodic peak around 975 mV in acidic and neutral pHs. Adsorption controlled oxidation observed at acidic pH 1.0 resulted in the maximum peak current response in cyclic voltammograms. A systematic differential pulse stripping voltammetric studies were carried out using the modified electrode at pH 1.0. The accumulation parameters, accumulation potential and time were optimized for maximum adsorption of the dye which was ascertained from the SEM photographs and XRD results. The stripping parameters were optimized and cali-bration was made under optimum conditions. The range of study was from 0.5 ppm to 100 ppm and the lower limit of determination was 100 ppm. Five identical experiments were carried out and the RSD value obtained was 2.5 % suggesting good reproducibility. The proposed method was successfully applied to de-termine the concentration of dye in the fabric and wastewater after dyeing