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Eu(III) removal from aqueous solutions using raw and modified pomegranate peel as biosorbents

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Abstract

Removal of Eu(III) from aqueous solutions was studied using pomegranate peel in raw and modified form as potential biosorbent. Low-cost chemical modifications of the material using acidic and alkaline reagents under moderate conditions were applied to improve its sorption ability. The sorption study was performed in the metal concentration range Cinit:5–300 mg L−1, regarding the effect of sorbent dosage, competitive ions, temperature and contact time. It was revealed that the biosorbent modified by alkaline reagent, exhibited considerable sorption capacity with qmax value 83.3 mg g−1 for europium. Langmuir and Freundlich linear isotherm equations were satisfactorily applied as well as simulation of the kinetics data at various temperatures using pseudo-first- and pseudo-second-order equations and thermodynamic data in order to explore the sorption mechanism. Meanwhile, characterization of the biosorbents before and after sorption was performed by SEM–EDS, XRD and FTIR while chemical modification of the biosorbents surface functional groups, revealed the involvement of carboxyl, hydroxyl and phosphate groups in biosorption. Desorption experiments demonstrated the environmental compatibility of the tested materials which could be used as potential sorbents in environmental technology.

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Acknowledgements

M.S.A. Busari Nasiru wants to thank the staff of the radiochemichal laboratory of the Chemistry Department-AUTh for supporting his research during the ERASMUS mobility program.

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Contributions

FN contributed to the study conception and design as well as to the writing of the manuscript. Materials preparation, experiments, data collection and analysis were performed by MSABN and PT. EP contributed to the materials characterization (SEM–EDS and XRD techniques). All the authors read and approved the final manuscript.

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Correspondence to F. Noli.

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The authors declare that they have no competing interests.

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Editorial responsibility: Samareh Mirkia.

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Noli, F., Busari Nasiru, M.S.A., Tsamos, P. et al. Eu(III) removal from aqueous solutions using raw and modified pomegranate peel as biosorbents. Int. J. Environ. Sci. Technol. 20, 3091–3100 (2023). https://doi.org/10.1007/s13762-022-04207-7

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  • DOI: https://doi.org/10.1007/s13762-022-04207-7

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