Electrochemical Sensor for Cu(II) Based on Carbon Nanotubes Functionalized with a Rationally Designed Schiff Base
This work proposes a new strategy for the electrochemical quantification of Cu(II) using glassy carbon electrodes (GCEs) modified with a nanohybrid of multiwall carbon nanotubes (MWCNTs) non-covalently functionalized with a rationally designed Schiff base containing different groups (SB-dBA). The pr...
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MDPI AG
2025-01-01
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| Series: | Chemosensors |
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| Online Access: | https://www.mdpi.com/2227-9040/13/2/35 |
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| author | Alejandro Tamborelli Michael López Mujica Gustavo Servetti Diego Venegas-Yazigi Patricio Hermosilla-Ibáñez Pablo Dalmasso Gustavo Rivas |
| author_facet | Alejandro Tamborelli Michael López Mujica Gustavo Servetti Diego Venegas-Yazigi Patricio Hermosilla-Ibáñez Pablo Dalmasso Gustavo Rivas |
| author_sort | Alejandro Tamborelli |
| collection | DOAJ |
| description | This work proposes a new strategy for the electrochemical quantification of Cu(II) using glassy carbon electrodes (GCEs) modified with a nanohybrid of multiwall carbon nanotubes (MWCNTs) non-covalently functionalized with a rationally designed Schiff base containing different groups (SB-dBA). The principle of sensing was the complexation of Cu(II) by the Schiff base that supports the MWCNTs at the open-circuit potential, followed by a reduction step at −0.600 V and further linear sweep anodic stripping voltammetry (LSASV) in a 0.200 M acetate buffer solution of pH 5.00. The linear range goes from 10 to 200 μg L<sup>−1</sup>, with a sensitivity of (0.79 ± 0.07) µA L µg<sup>−1</sup> (R<sup>2</sup> = 0.991), a detection limit of 3.3 μg L<sup>−1</sup>, and a reproducibility of 8.0% for the same nanohybrid (nine electrodes) and 9.0% for four different nanohybrids. The proposed sensor was very selective for Cu(II) even in the presence of Pb(II), Fe(II), As(III), Cr(III), Cd(II), and Hg(II), and it was successfully used for the quantification of Cu(II) in different water samples (tap, groundwater, and river) without any pretreatment. |
| format | Article |
| id | doaj-art-0c2178a3d53d4de38c43f4ea0dfc3129 |
| institution | DOAJ |
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| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
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| series | Chemosensors |
| spelling | doaj-art-0c2178a3d53d4de38c43f4ea0dfc31292025-08-20T02:44:52ZengMDPI AGChemosensors2227-90402025-01-011323510.3390/chemosensors13020035Electrochemical Sensor for Cu(II) Based on Carbon Nanotubes Functionalized with a Rationally Designed Schiff BaseAlejandro Tamborelli0Michael López Mujica1Gustavo Servetti2Diego Venegas-Yazigi3Patricio Hermosilla-Ibáñez4Pablo Dalmasso5Gustavo Rivas6CIQA, CONICET, Departamento de Ingeniería Química, Facultad Regional Córdoba, Universidad Tecnológica Nacional, Maestro López esq. Cruz Roja Argentina, 5016 Córdoba, ArgentinaINFIQC, CONICET-UNC, Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000 Córdoba, ArgentinaCIQA, CONICET, Departamento de Ingeniería Química, Facultad Regional Córdoba, Universidad Tecnológica Nacional, Maestro López esq. Cruz Roja Argentina, 5016 Córdoba, ArgentinaDepartamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago 9170022, ChileDepartamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago 9170022, ChileCIQA, CONICET, Departamento de Ingeniería Química, Facultad Regional Córdoba, Universidad Tecnológica Nacional, Maestro López esq. Cruz Roja Argentina, 5016 Córdoba, ArgentinaINFIQC, CONICET-UNC, Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000 Córdoba, ArgentinaThis work proposes a new strategy for the electrochemical quantification of Cu(II) using glassy carbon electrodes (GCEs) modified with a nanohybrid of multiwall carbon nanotubes (MWCNTs) non-covalently functionalized with a rationally designed Schiff base containing different groups (SB-dBA). The principle of sensing was the complexation of Cu(II) by the Schiff base that supports the MWCNTs at the open-circuit potential, followed by a reduction step at −0.600 V and further linear sweep anodic stripping voltammetry (LSASV) in a 0.200 M acetate buffer solution of pH 5.00. The linear range goes from 10 to 200 μg L<sup>−1</sup>, with a sensitivity of (0.79 ± 0.07) µA L µg<sup>−1</sup> (R<sup>2</sup> = 0.991), a detection limit of 3.3 μg L<sup>−1</sup>, and a reproducibility of 8.0% for the same nanohybrid (nine electrodes) and 9.0% for four different nanohybrids. The proposed sensor was very selective for Cu(II) even in the presence of Pb(II), Fe(II), As(III), Cr(III), Cd(II), and Hg(II), and it was successfully used for the quantification of Cu(II) in different water samples (tap, groundwater, and river) without any pretreatment.https://www.mdpi.com/2227-9040/13/2/35copperelectrochemical sensormultiwall carbon nanotubesSchiff basecarbon nanotube dispersionnon-covalent functionalization |
| spellingShingle | Alejandro Tamborelli Michael López Mujica Gustavo Servetti Diego Venegas-Yazigi Patricio Hermosilla-Ibáñez Pablo Dalmasso Gustavo Rivas Electrochemical Sensor for Cu(II) Based on Carbon Nanotubes Functionalized with a Rationally Designed Schiff Base Chemosensors copper electrochemical sensor multiwall carbon nanotubes Schiff base carbon nanotube dispersion non-covalent functionalization |
| title | Electrochemical Sensor for Cu(II) Based on Carbon Nanotubes Functionalized with a Rationally Designed Schiff Base |
| title_full | Electrochemical Sensor for Cu(II) Based on Carbon Nanotubes Functionalized with a Rationally Designed Schiff Base |
| title_fullStr | Electrochemical Sensor for Cu(II) Based on Carbon Nanotubes Functionalized with a Rationally Designed Schiff Base |
| title_full_unstemmed | Electrochemical Sensor for Cu(II) Based on Carbon Nanotubes Functionalized with a Rationally Designed Schiff Base |
| title_short | Electrochemical Sensor for Cu(II) Based on Carbon Nanotubes Functionalized with a Rationally Designed Schiff Base |
| title_sort | electrochemical sensor for cu ii based on carbon nanotubes functionalized with a rationally designed schiff base |
| topic | copper electrochemical sensor multiwall carbon nanotubes Schiff base carbon nanotube dispersion non-covalent functionalization |
| url | https://www.mdpi.com/2227-9040/13/2/35 |
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