Cu-MOF/N-doped GO nanocomposites modified screen-printed carbon electrode towards detection of 4-nitrophenol

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 919; p. 116542
• Main Authors: Ambaye, Abera Demeke, Kefeni, Kebede Keterew, Kebede, Temesgen Girma, Ntsendwana, Bulelwa, Mishra, Shivani Bhardwaj, Nxumalo, Edward Ndumiso
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.08.2022; Elsevier Science Ltd
• Subjects: Carbon; Charge transfer; Chemical sensors; Copper; Electrochemical impedance spectroscopy; Electrochemical sensor; Electrode materials; Electrodes; Field emission microscopy; Graphene; High resolution electron microscopy; Metal-organic frameworks; Microscopy; Nanocomposites; Nanomaterial; Nitrophenol; Raman spectroscopy; Reproducibility; Screen-printed electrode; Selectivity; Solvothermal; Spectroscopic analysis; Spectrum analysis; Thermogravimetric analysis; Voltammetry; Wastewater; Water sampling; Screen-printed electrode; Electrochemical sensor; Wastewater; Solvothermal; Nanomaterial
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/j.jelechem.2022.116542

[Display omitted] •NGO were incorporated into Cu-MOF using a modified solvothermal approach.•NGO improved the electroconductive properties of Cu-MOF material.•Cu-MOF/NGO/SPCE showed lower LOD and LOQ.•Cu-MOF/NGO/SPCE was found selective for detection of 4-NP in wastewater. Metal-organic framework-based nanocomposites have recently received much attention in electrochemical sensors. Herein, copper-metal organic framework/nitrogen-doped graphene oxide (Cu-MOF/NGO) nanocomposites were synthesized using a solvothermal approach. The materials were characterized by field emission scanning electron microscopy/energy-dispersive X-ray spectroscopy, high-resolution transmission electron microscopy, Brunauer–Emmett–Teller analysis, X-ray diffraction analysis, thermogravimetric analysis, and UV-visible spectroscopy. The Cu-MOF/NGO nanocomposites were applied in the modification of a screen-printed carbon electrode (SPCE) towards detection of 4-nitrophenol (4-NP) using differential pulse voltammetry. Moreover, the electrode materials were characterized using Raman spectroscopy, atomic force microscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. In ferricyanide and ferrocene redox probes, the Cu-MOF/NGO/SPCE showed improved current response and charge transfer kinetics. The Cu-MOF/NGO/SPCE showed a lower limit of detection (0.035 μmol L−1) and limit of quantification (0.116 μmol L−1) within a linear range of concentration (0.5–100 μmol L−1). The developed electrode demonstrated good analytical features of selectivity, repeatability, and reproducibility. The application of the Cu-MOF/NGO/SPCE was found to be successful in the determination of 4-NP in wastewater samples, with good recovery results in the range of 103.00 to 107.33%.