A Facile Electrochemical Sensor Based on PyTS⁻CNTs for Simultaneous Determination of Cadmium and Lead Ions

Sensors
Ruyuan JiangGuangzhi Hu

Abstract

A simple and easy method was implemented for the contemporary detection of cadmium (Cd2+) and lead (Pb2+) ions using 1,3,6,8-pyrenetetrasulfonic acid sodium salt-functionalized carbon nanotubes nanocomposites (PyTS⁻CNTs). The morphology and composition of the obtained PyTS⁻CNTs were characterized using scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), and X-ray photoelectron spectroscopy (XPS). The experimental results confirmed that the fabricated PyTS⁻CNTs exhibited good selectivity and sensitivity for metal ion-sensing owing to the insertion of sulfonic acid groups. For Cd2+ and Pb2+, some of the electrochemical sensing parameters were evaluated by varying data such as the PyTS⁻CNT quantity loaded on the pyrolytic graphite electrode (PGE), pH of the acetate buffer, deposition time, and deposition potential. These parameters were optimized with differential pulse anodic sweeping voltammetry (DPASV). Under the optimal condition, the stripping peak current of the PyTS⁻CNTs/Nafion/PGE varies linearly with the heavy metal ion concentration, ranging from 1.0 μg L-1 to 90 μg L-1 for Cd2+ and from 1.0 μg L-1 to 110 μg L-1 for Pb2+. The limits of detection were estimated to be approximately 0.8 μg L-1 for Cd2+...Continue Reading

References

Oct 20, 2010·Nanoscale·Shuyun Zhu, Guobao Xu
Aug 11, 2015·Analytical Chemistry·Daoli ZhaoWilliam R Heineman
Mar 10, 2015·Science and Technology of Advanced Materials·Tsuyohiko Fujigaya, Naotoshi Nakashima
Jan 18, 2017·Food Additives & Contaminants. Part B, Surveillance·Vladimir TomovićAleksandra Martinović
May 12, 2017·Journal of Hazardous Materials·Bagher HayatiGordon McKay

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Methods Mentioned

BETA
atomic
atomic fluorescence spectrometry
scanning electron microscopy

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