A Silver-Loaded Exfoliated Graphite Nanocomposite Anti-Fouling Electrochemical Sensor for Bisphenol A in Thermal Paper Samples.
| Autor: | Tsekeli TR; Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa., Sebokolodi TI; Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa., Karimi-Maleh H; Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa.; University of Electronic Science and Technology of China, Chengdu 611731, China., Arotiba OA; Department of Chemical Sciences, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa.; Centre for Nanomaterials Science Research, University of Johannesburg, Johannesburg 2028, South Africa. |
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| Jazyk: | angličtina |
| Zdroj: | ACS omega [ACS Omega] 2021 Apr 02; Vol. 6 (14), pp. 9401-9409. Date of Electronic Publication: 2021 Apr 02 (Print Publication: 2021). |
| DOI: | 10.1021/acsomega.0c05836 |
| Abstrakt: | Silver nanoparticles (AgNPs) were synthesized separately and loaded onto the expanded layers of exfoliated graphite (EG) to form a silver nanoparticle-exfoliated graphite nanocomposite (AgNPs-EG). The AgNPs-EG was compressed into a pellet (0.6 cm in diameter) and used to prepare an electrochemical sensor for bisphenol A (BPA) in standard samples and in thermal paper. The synthesized materials were characterized by ultraviolet-visible spectrophotometry, X-ray diffraction spectroscopy, scanning electron microscopy, and energy-dispersive X-ray. The electrochemical behavior of BPA on the AgNPs-EG sensor was investigated by cyclic voltammetry and square wave voltammetry. Under optimized experimental conditions, the oxidation peak current was linearly proportional to bisphenol A concentrations in the range from 5.0 to100 μM, with a coefficient of determination ( R 2 ) of 0.9981. The obtained limit of detection of the method was 0.23 μM. The fabricated sensor was able to overcome electrode fouling with good reproducibility (RSD = 2.62%, n = 5) by mechanical polishing of the electrode on emery paper. The proposed method was successfully applied to determine bisphenol A in thermal paper samples and demonstrated good accuracy of 93.1 to 113% recovery. Competing Interests: The authors declare no competing financial interest. (© 2021 American Chemical Society.) |
| Databáze: | MEDLINE |
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