Application of BiNPs/MWCNTs-PDA/GC sensor to measurement of Tl (1) and Pb (II) using stripping voltammetry. (August 2022)

• Record Type: Journal Article
• Authors: Nodehi, Marzieh; Baghayeri, Mehdi; Kaffash, Afsaneh
• Is Part Of: Chemosphere. Volume 301(2022)
• Publication Date: 2022-08
• Subjects: Simultaneous determination -- Tl (I) and Pb (II) -- Polydopamine functionalized multi-walled carbon nanotubes -- BiNPs -- Stripping voltammetry; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2022.134701
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Herein, simultaneous determination of Tl (1) and Pb (II) has been carried out at the surface of a modified glassy carbon electrode with polydopamine functionalized multi-walled carbon nanotubes- BiNPs nanocomposite (BiNPs/MWCNTs-PDA/GC) using square-wave anodic stripping voltammetry (SWASV) technique. The morphologies, composition and, electrochemical properties of the BiNPs/MWCNTs-PDA/GC were characterized by scanning electron microscopy (SEM), transition electron microscopy (TEM), X-ray energy dispersive spectroscopy (EDX), electrochemical impedance spectroscopy (EIS) and, SWASV. The parameters affecting the stripping current response were investigated and optimized. The large specific area of MWCNTs and good electro-conductibility of BiNPs causes the BiNPs/MWCNTs-PDA/GC electrode to exhibit an excellent electro-catalytic effect with good separation peaks for Tl and Pb oxidation compared to bare GCE under the optimal conditions. The proposed sensor showed wide leaner ranges from 0.4–100 ppb and 100–400 ppb for Tl (I) and Pb (II). Low detection limits of 0.04 ppb for Tl (I) and 0.07 ppb for Pb (II) were achieved. The efficiency of the electrode after thirty days of storage in ambient conditions without using it and also with the ability to reuse for 16 days did not decrease significantly. In addition, the modified electrode with simple preparation method showed good reproducibility, and high selectivity for measuring target ions. The method was successfully implemented for the simultaneous determination of Tl (I) and Pb (II) in tap, mineral and waste water samples with acceptable recovery (from 99.1–103.2 for Tl (I) and 98.4–100.4 for Pb (II)). Graphical abstract: Schematic for simultaneous determination of Tl (I) and Pb (II) on the surface of BiNPs/MWCNTs-PDA/GC by square wave anodic stripping voltammetry. Image 1 Highlights: A simple sensor intruduced for codetection of Tl(I) and Pb(II) by SWASV. The sensor prepared by BiNPs electrodeposited on the MWCNTs-PDA/GCE surface. The sensor indicated low detection limit with high selectivity for Tl and Pb ions. The application of the developed sensor was successfully studied in water samples.