Nashrieh Shimi va Mohandesi Shimi Iran

Nashrieh Shimi va Mohandesi Shimi Iran

Fabrication of Rhodamine B Measurement Electrochemical Sensor Using a Carbon Paste Electrode Modified with Functionalized Carbon Nanotubes and Titanium Dioxide Nanoparticles

Document Type : Research Article

Authors
Mina Vafakhah
Mostafa Rahimnejad
Rozan Zokhtareh
Biofuels and Renewable Energy Research Center, Department of Biotechnology, Faculty of Chemical Engineering, Babol Noshirvani University of Technology, Babol, IR. IRAN.
Abstract
The unauthorized use of synthetic dyes in food products has adverse effects on human health and it is considered a serious threat to the future generations of mankind. Therefore, the present research was conducted with the aim of providing an efficient electrochemical sensor for the detection of Rhodamine B (RhB) dye in food samples. For this purpose, a carbon paste electrode (CPE) modified with functionalized multi-walled carbon nanotubes (F-MWCNTs) and titanium dioxide nanoparticles (TiO2NPs) was used. The functionalization process of carbon nanotubes CNTs and the surface morphology of the designed sensor were evaluated using Fourier-transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy (FESEM), respectively. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) methods were used to investigate the electrochemical properties of F-MWCNTs/TiO2NPs/CPE. Also, to achieve the best sensor performance, the electrochemical behavior of RhB on the F-MWCNTs/TiO2NPs/CPE surface was carefully studied and various variables were optimized. By using differential pulse voltammetry (DPV) method, it was found that under optimal conditions, the response of sensor to RhB is linear in two concentration ranges of 1.0×101-1.0×102 nM and 1.0×102-6.0×103 nM, and the limit of detection (LOD), limit of quantification (LOQ), and the sensitivity of the sensor in the first linear range were calculated to be 1.46 nM, 4.87 nM, and 1092.02 µA/µM cm2, respectively. The proposed sensor also demonstrated its stability, repeatability, and selectivity in RhB measurement.
Keywords
Carbon paste electrode
Electrochemical sensor
Rhodamine B
Carbon nanotubes
Titanium dioxide nanoparticles

Subjects

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