Abstract
Two electrochemical sensors based on modified glassy carbon electrodes with carbon nanostructures as graphene (GCE–EG) and carbon nanotubes (GCE–CNT) were evaluated for morpholine analysis. The carbon nanostructures were obtained and characterized using X-ray photoelectron spectroscopy, Raman spectroscopy, X-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy and cyclic voltammetry. All spectroscopic and microscopic techniques confirmed the procurement of graphene and CNT. The electrochemical studies proved the efficient behaviour of both electrodes GCE–EG and GCE–CNT in sensing and detection of morpholine via differential pulse voltammetry. The area of the anodic peaks was correlated with the concentration of the analyte. It was observed that the implementation of a thin film of EG and CNT on the GCE promoted the electrocatalytic activity towards morpholine electro-oxidation, and a considerable increase in the corresponding oxidation peak was observed in both cases. Theoretical detection limits of 1.0 and 1.3 mg l–1 were obtained for GCE–EG and GCE–CNT, respectively. These merit figures, both satisfactorily meet the requirements of the Food and Drug Administration for morpholine detection in real applications. Finally, the sample recovery for GCE–EG and GCE–CNT sensors were, respectively, 107 and 103%, at 20.0 mg l–1 morpholine in the boiler water.
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Acknowledgements
We thank Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for financial support.
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de Oliveira, S.M., dos Santos Castro Assis, K.L., Paiva, V.M. et al. Facile electrochemical detection of morpholine in boiler water with carbon nanostructures: a comparative study of graphene and carbon nanotubes. Bull Mater Sci 45, 100 (2022). https://doi.org/10.1007/s12034-022-02669-6
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DOI: https://doi.org/10.1007/s12034-022-02669-6