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Applying bottom ash as an alternative Fenton catalyst for effective removal of phenol from aqueous environment

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Abstract

In this study, coal bottom ash from a thermoelectric plant was tested as an alternative Fenton catalyst for phenol degradation in water. The effect of operating parameters such as initial pH, catalyst dosage and H2O2 concentration were evaluated. The characterization results indicated that the material has a mesoporous structure, with active species (Fe) well distributed on its surface. Under the optimal reaction conditions (6 mM H2O2, 1 g L−1 of catalyst and pH = 3), 98.7% phenol degradation efficiency was achieved in 60 min, as well as 71.6% TOC removal after 150 min. Hydroxyl radical was identified as the main oxidizing agent involved on the cleavage of the phenol molecule. After four consecutive reuse cycles, phenol degradation efficiency was around 80%, indicating good reusability and stability of the catalyst. Therefore, the obtained results demonstrated that the bottom ash presents remarkable activity for application in the Fenton reaction towards phenol degradation.

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Data availability

The datasets used and analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors thank the Coordination for the Improvement of Higher Education Personnel (CAPES) and the National Agency for Petroleum, Natural Gas, and Biofuels (ANP) for financial support. In addition, the authors gratefully acknowledge the analysis support from the Chemistry Institute (IQ), Laboratório de Peneiras Moleculares (LABPEMOL), Núcleo de Processamento Primário e Reúso de Água Produzida e Resíduos (NUPPRAR), and Materials Engineering Department (DEMat) from UFRN.

Funding

This work was supported by CAPES (Coordination for the Improvement of Higher Education Personnel) and CNPq (National Council for Scientific and Technological Development) for financial support.

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Conceptualization: (Luana Rabelo Hollanda, Osvaldo Chiavone-Filho); Methodology: (Joyce Azevedo Bezerra de Souza), Formal analysis and investigation: (Luana Rabelo Hollanda, Joyce Azevedo Bezerra de Souza); Writing—original draft preparation: (Luana Rabelo Hollanda, Edson Luiz Foletto, Guilherme Luiz Dotto); Writing—review and editing: (Guilherme Luiz Dotto, Edson Luiz Foletto); Funding acquisition: (Osvaldo Chiavone-Filho); Supervision: (Osvaldo Chiavone-Filho). All authors read and approved the final manuscript.

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Correspondence to Guilherme Luiz Dotto.

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Hollanda, L.R., de Souza, J.A.B., Foletto, E.L. et al. Applying bottom ash as an alternative Fenton catalyst for effective removal of phenol from aqueous environment. Environ Sci Pollut Res 30, 120763–120774 (2023). https://doi.org/10.1007/s11356-023-30890-1

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  • DOI: https://doi.org/10.1007/s11356-023-30890-1

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