Abstract
A simple, efficient, environmentally friendly, and inexpensive synthesis route was developed to obtain a magnetic nano-hybrid (GH) based on graphene and cobalt ferrite. Water with a high content of natural organic matter (NOM) was used as solvent and a source of carbon. The presence of NOM in the composition of GH was confirmed by FTIR and Raman spectroscopy, which evidenced the formation of graphene, as also corroborated by XRD analyses. The diffractograms and TEM images showed the formation of a hybrid nanomaterial composed of graphene and cobalt ferrite, with crystallite and particle sizes of 0.83 and 4.0 nm, respectively. The heterogeneous electro-Fenton process (EF-GH) achieved 100% degradation of bisphenol A (BPA) in 50 min, with 80% mineralization in 7 h, at pH 7, using a current density of 33.3 mA cm−2. The high catalytic performance was achieved at neutral pH, enabling substantial reduction of the costs of treatment processes. This work contributes to understanding the role of NOM in the synthesis of a magnetic nano-hybrid based on graphene and cobalt ferrite, for use in heterogeneous catalysis. This nano-hybrid has excellent potential for application in the degradation of persistent organic pollutants found in aquatic environments.
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The research leading to these results received funding from Coordination for the Improvement of Higher Education Personnel (CAPES) under Grant numbers Finance Code 001 and 88887136426/2017/00. The authors are grateful for the support provided by the Brazilian National Council for Scientific and Technological Development (CNPq, grants 465571/2014-0 and 310921/2019-8), the Sergipe State Research Foundation (FAPITEC/SE), and the Multi-user Chemistry Laboratories Center (CLQM) of the Federal University of Sergipe for provision of analytical facilities.
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All authors contributed to the study conception and/or design. Conceptualization: Graziele da Costa Cunha; Methodology: Clecia Andrade dos Santos; Formal analysis and investigation: Clecia Andrade dos Santos, Daiane Requião de Souza Cruz, Wenes Ramos da Silva, Gleyce Kelly de Jesus and Alessandra Ferreira dos Santos; Writing - original draft preparation: Clecia Andrade dos Santos; Writing - review and editing: Daiane Requião de Souza Cruz, Graziele da Costa Cunha, Luciane Pimenta Cruz Romão and Alberto Wisniewski Jr; Funding acquisition: Luciane Pimenta Cruz Romão; Resources: Luciane Pimenta Cruz Romão; Supervision: Luciane Pimenta Cruz Romão.
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dos Santos, C.A., de Souza Cruz, D.R., da Silva, W.R. et al. Heterogeneous electro-Fenton process for degradation of bisphenol A using a new graphene/cobalt ferrite hybrid catalyst. Environ Sci Pollut Res 28, 23929–23945 (2021). https://doi.org/10.1007/s11356-020-11913-7
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DOI: https://doi.org/10.1007/s11356-020-11913-7