Overoxidized Polypyrrole/Sodium Dodecyl Sulfate/Single Wall Carbon Nanotubes Matrix for the Simultaneous Electrochemical Determination of Heavy Metal Ions by Adsorptive Stripping Voltammetry

2020 ◽  
Vol 18 (11) ◽  
pp. 811-818
Author(s):  
Sarra Slimi ◽  
Houcine Barhoumi ◽  
Nicole Jaffrezic-Renault
Keyword(s):  
Carbon Nanotubes ◽  
Metal Ions ◽  
Anodic Stripping Voltammetry ◽  
Sodium Dodecyl ◽  
Stripping Voltammetry ◽  
Electrochemical Determination ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Lead And Cadmium ◽  
Overoxidized Polypyrrole

In this work, we report an overoxidized polypyrrole (oPPy)/single-wall carbon nanotubes (SWCNTs) matrix, electrochemically coated onto a glassy carbon electrode (GCE). This matrix was characterized by AFM, FTIR, and cyclic voltammetry. It is shown that the developed permslective matrix allows the simultaneous quantification of multiple metal ions, including zinc, cadmium, and lead, using square wave anodic stripping voltammetry. The sensitivities of the oPPy/SWCNTs/GCE for Zn2+, Cd2+, and Pb2+ are respectively, 8.89, 41.3, and 45.4 μA mol L~1. The detection limits of Cd2+ and Pb2+ were found to be respectively equal to 37 μg/L and 69 μg/L In addition, the developed oPPy/SWCNTs based sensor has been successfully used for the detection of lead and cadmium in wastewater samples.

scholarly journals Functionalization of PET Track-Etched Membranes by UV-Induced Graft (co)Polymerization for Detection of Heavy Metal Ions in Water

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1876 ◽  
Author(s):  
Maxim V. Zdorovets ◽  
Ilya V. Korolkov ◽  
Arman B. Yeszhanov ◽  
Yevgeniy G. Gorin
Keyword(s):  
Water Quality ◽  
Heavy Metal ◽  
Metal Ions ◽  
Photoelectron Spectroscopy ◽  
Heavy Metal Ions ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Water Quality Monitoring ◽  
Lead And Cadmium ◽  
Platinum Layer

Nowadays, water quality monitoring is an essential task since environmental contamination and human exposure to heavy metals increased. Sensors that are able to detect ever lower concentrations of heavy metal ions with greater accuracy and speed are needed to effectively monitor water quality and prevent poisoning. This article shows studies of the modification of flexible track-etched membranes as the basis for the sensor with various polymers and their influence on the accuracy of detection of copper, cadmium, and lead ions in water. We report the UV-induced graft (co)polymerization of acrylic acid (AA) and 4-vinylpyridine (4-VPy) on poly(ethylene terephthalate) track-etched membrane (PET TeMs) and use them after platinum layer sputtering in square wave anodic stripping voltammetry (SW-ASV) for detection of Cu2+, Cd2+, and Pb2+. Optimal conditions leading to functionalization of the surface and retention of the pore structure were found. Modified membranes were characterized by SEM, FTIR, X-ray photoelectron spectroscopy (XPS) and colorimetric analysis. The dependence of the modification method on the sensitivity of the sensor was shown. Membrane modified with polyacrylic acid (PET TeMs-g-PAA), poly(4-vinylpyridine) (PET TeMs-g-P4VPy), and their copolymer (PET TeMs-g-P4VPy/PAA) with average grafting yield of 3% have been found to be sensitive to µg/L concentration of copper, lead, and cadmium ions. Limits of detection (LOD) for sensors based on PET TeMs-g-PAA are 2.22, 1.05, and 2.53 µg/L for Cu2+, Pb2+, and Cd2+, respectively. LODs for sensors based on PET TeMs-g-P4VPy are 5.23 µg/L (Cu2+), 1.78 µg/L (Pb2+), and 3.64 µg/L (Cd2+) µg/L. PET TeMs-g-P4VPy/PAA electrodes are found to be sensitive with LODs of 0.74 µg/L(Cu2+), 1.13 µg/L (Pb2+), and 2.07 µg/L(Cd2+). Thus, it was shown that the modification of membranes by copolymers with carboxylic and amino groups leads to more accurate detection of heavy metal ions, associated with the formation of more stable complexes.

scholarly journals The effect of oxidation on structural and electrical properties of single wall carbon nanotubes

2011 ◽  
Vol 65 (4) ◽  
pp. 363-370 ◽  
Author(s):  
Zoran Markovic ◽  
Davor Perusko ◽  
Dragana Tosic ◽  
Nebojsa Romcevic ◽  
Miroslav Dramicanin ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Properties ◽  
Elevated Temperatures ◽  
Sodium Dodecyl ◽  
Copper Substrate ◽  
Carbon Matrix ◽  
Deposition Process ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Deposited Films

Single wall carbon nanotubes (SWCNTs) represent an important group of nanomaterials with attractive electrical, chemical, and mechanical properties. In this work we have investigated the structural, optical and electrical properties of single wall carbon nanotube films deposited on copper substrate and then transferred to polymethyl methacrylate (PMMA). The properties of deposited films were varied by changing different parameters: substrate temperature, deposition time and electric field strength. Atomic force microscopy (AFM) has been used to study the deposition process of SWCNT films on copper substrate. AFM analysis has shown that sodium dodecyl sulfate (SDS) micellas were deposited on copper substrate before carbon nanotubes because of their higher mobility. Raman spectroscopy revealed that SWCNTs deposited at elevated temperatures are oxidized. FTIR results showed that COOH groups and Cu2O were generated during electrophoretic process. The SWCNT films were transferred to PMMA substrate and they achieved a sheet resistance of 360 ?/sq with 79% transparency at 550 nm wavelength and a strong adhesion to the substrate. The main reasons for higher values of sheet resistances of SWCNT thin films compared to those of other authors are oxidation of carbon nanotubes during electrophoresis and the presence of used surfactans in carbon matrix of deposited films.

scholarly journals Removal of sodium dodecyl sulfate surfactant from aqueous dispersions of single-wall carbon nanotubes

2017 ◽  
Vol 495 ◽  
pp. 140-148 ◽  
Author(s):  
Jamie E. Rossi ◽  
Karen J. Soule ◽  
Erin Cleveland ◽  
Scott W. Schmucker ◽  
Cory D. Cress ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Sodium Dodecyl Sulfate ◽  
Sodium Dodecyl ◽  
Single Wall Carbon Nanotubes ◽  
Aqueous Dispersions ◽  
Single Wall Carbon ◽  
Dodecyl Sulfate

Strongly Bound Sodium Dodecyl Sulfate Surrounding Single-Wall Carbon Nanotubes

Langmuir ◽  
2017 ◽  
Vol 33 (20) ◽  
pp. 5006-5014 ◽  
Author(s):  
Jia Xu ◽  
Robert Mueller ◽  
Eric Hazelbaker ◽  
Yang Zhao ◽  
Jean-Claude J. Bonzongo ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Sodium Dodecyl Sulfate ◽  
Sodium Dodecyl ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Dodecyl Sulfate
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