Highly sensitive and selective determination of p-nitrophenol at an interpenetrating networks structure of self-assembled rod-like lanthanum hydroxide-oxidized multi-walled carbon nanotubes nanocomposite
| Autor: | Zhao-Ning Huang, Jin-Feng Guan, Jiao Zou, Jingang Yu, Meng-Meng Yuan |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Health Toxicology and Mutagenesis 0211 other engineering and technologies chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences Nanocomposites Nitrophenols Nitrophenol chemistry.chemical_compound Lanthanum Limit of Detection Electrodes 0105 earth and related environmental sciences Detection limit 021110 strategic defence & security studies Nanocomposite Nanotubes Carbon Public Health Environmental and Occupational Health General Medicine Electrochemical Techniques Pollution Dielectric spectroscopy Electrochemical gas sensor chemistry Linear sweep voltammetry Cyclic voltammetry Oxidation-Reduction Nuclear chemistry |
| Zdroj: | Ecotoxicology and environmental safety. 201 |
| ISSN: | 1090-2414 |
| Popis: | In this study, a novel electrochemical sensor based on self-assembled rod-like lanthanum hydroxide-oxidized multi-walled carbon nanotubes (La(OH)3-OxMWCNTs) nanocomposite was developed for sensitive determination of p-nitrophenol (p-NP). The La(OH)3-OxMWCNTs nanocomposite with an interpenetrating networks structure was characterized by field emission electron microscope (FE-SEM), Fourier transform infrared (FT-IR) spectroscopy, Raman spectra and X-ray photoelectron spectroscopy (XPS). The cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements were performed to study the electrochemical behaviors of La(OH)3-OxMWCNTs modified glassy carbon electrode (La(OH)3-OxMWCNTs/GCE). The La(OH)3-OxMWCNTs/GCE was used for sensitive determination of p-NP by CV and linear sweep voltammetry (LSV). Under the optimum conditions, the peak currents of LSV versus the concentrations of p-NP in the range 1.0–30.0 μmol L−1 showed a good linear relationship (R2=0.9971), and the limit of detection (LOD) was calculated to be 0.27 μmol L−1 (signal-to-noise ratio of 3, S/N=3). The recoveries of p-NP in real samples of industrial wastewater and Xiangjiang water at La(OH)3-OxMWCNTs/GCE were in the range of 95.62-110.75% with relative standard deviation (RSD) in the range of 1.65-3.85%. The intra-day and inter-day precisions were estimated to be less than 2.76% (n= 5), indicating that La(OH)3-OxMWCNTs/GCE possessed highly stability. In addition, La(OH)3-OxMWCNTs/GCE sensor showed good anti-interference ability for determination of p-NP in aqueous mixtures containing high concentrations of inorganic and organic interferents, and a decrease of oxidation peak currents by less than 3.57% relative to the initial levels indicated it possessed excellent selectivity. Therefore, La(OH)3-OxMWCNTs/GCE could be used as a fast, selective and sensitive electrochemical sensor platform for the selective determination and quantification of aqueous p-NP. |
| Databáze: | OpenAIRE |
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