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Enhancing Methylene Blue Dye Removal using pyrolyzed Mytella falcata Shells: Characterization, Kinetics, Isotherm, and Regeneration through Photolysis and Peroxidation

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Abstract

The potential of pyrolyzed Mytella falcata shells as an adsorbent for removing methylene blue dye molecules from aqueous solutions was investigated. The study found that the adsorbent produced at 600 °C of pyrolysis temperature, with an adsorbent mass of 0.5 g, particle diameter of 0.297–0.149 mm, and pH 12.0, demonstrated the highest dye molecule removal efficiency of 82.41%. The material’s porosity was observed through scanning electron microscopy, which is favorable for adsorption, while Fourier-transform infrared spectroscopy and X-Ray diffraction analysis analyses confirmed the presence of calcium carbonate in the crystalline phases. The pseudo-second order model was found to be the best fit for the data, suggesting that the adsorption mechanism involves two steps: external diffusion and diffusion via the solid pores. The Redlich-Peterson isotherm model better represented the equilibrium data, and the methylene blue adsorption was found to be spontaneous, favorable, and endothermic. The hydrogen peroxide with UV oxidation was found to be the most efficient method of regeneration, with a regeneration percentage of 63% achieved using 600 mmol.L−1 of oxidizing agents. The results suggest that pyrolyzed Mytella falcata shells could serve as an ecologically viable adsorbent alternative, reducing the amount of waste produced in the local environment and at the same time removing pollutants from the water. The material’s adsorption capacity remained almost constant in the first adsorption-oxidation cycles, indicating its potential for repeated use.

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Acknowledgements

We thank to National Council for Scientific and Technological Development (CNPq/Brazil), Coordination for the Improvement of Higher Education Personnel (CAPES/Brazil) and Foundation for Research Support of the Alagoas (FAPEAL/Brazil).

Author contributions

All authors contributed to the study conception and design. All authors read and approved the final manuscript. RSL executed the experiments and manuscript writing; JT, SR, DPF, JG, CMLPS and LM carried out the manuscript interpretation and corrections.

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Correspondence to Lucas Meili.

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de Lima, R.S., Tonholo, J., Rangabhashiyam, S. et al. Enhancing Methylene Blue Dye Removal using pyrolyzed Mytella falcata Shells: Characterization, Kinetics, Isotherm, and Regeneration through Photolysis and Peroxidation. Environmental Management 73, 425–442 (2024). https://doi.org/10.1007/s00267-023-01898-7

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  • DOI: https://doi.org/10.1007/s00267-023-01898-7

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