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Sorption of benzo[a]pyrene by Chernozem and carbonaceous sorbents: comparison of kinetics and interaction mechanisms

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Abstract

Benzo[a]pyrene (BaP) is a polycyclic aromatic hydrocarbon, highly persistent and toxic and a widespread environmental pollutant. Although various technologies have been developed to remove BaP from the environment, its sorption through solid matrixes has received increasing attention due to cost-effectiveness. The present research compares the adsorption capacity of Haplic Chernozem, granular activated carbon and biochar in relation to BaP from water solution. Laboratory experiments with different initial BaP concentrations in the liquid phase and different ratios of the solid and liquid phases show that Freundlich model describes well the adsorption isotherms of BaP by the soil and both sorbents. Moreover, the BaP isotherm sorption by the Haplic Chernozem is better illustrated by the Freundlich model than the Langmuir equation. The results reveal that the sorption capacity of the carbonaceous adsorbents at a ratio 1:20 (solid to liquid phases) is orders of magnitude higher (13 368 ng mL−1 of activated carbon and 3 578 ng mL−1 of biochar) compared to the soil (57.8 ng mL−1). At the ratio of 0.5:20, the adsorption capacity of the carbonaceous sorbents was 17–45 times higher than that of the soil. This is due to the higher pore volume and specific surface area of the carbonaceous sorbents than soil particles, assessed through scanning electron microscopy. The sorption kinetic of BaP by Chernozem was compared with the adsorption kinetics by the carbonaceous sorbents. Results indicate that the adsorption dynamic involves two steps. The first one is associated with a fast BaP adsorption on the large available surface and inside macro- and meso-pores of the sorbent particles of the granular activated carbon and biochar. Then, the adsorption is followed by a slower process of BaP penetration into the microporous space and/or redistribution into a hydrophobic fraction. The effectiveness of the sorption process depends on both the sorbent properties and the solvent competition. Overall, the granular activated carbon and biochar are highly effective adsorbents for BaP, whereas the Haplic Chernozem has a rather limited capacity to remove BaP from contaminated solutions.

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The raw/processed data required to reproduce these findings cannot be shared at this time as the data also form part of an ongoing study.

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Acknowledgments

The research was financially supported by the Russian Science Foundation (project no. 20-14-00317).

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Contributions

Tatiana Minkina: Conceptualization, Formulation of a Research Problem, Writing. Galina Vasilyeva: Data Curation, Writing—Reviewing. Yana Popileshko: Conducting Experiments. Tatiana Bauer: Writing. Svetlana Sushkova: Preparation of Biochar. Aleksey Fedorenko: Visualization. Elena Antonenko: Conducting Experiments. David Pinskii: Methodology. Mahmoud Mazarji: Writing—Review & Editing. Carla Sofia Santos Ferreira: Writing—Review & Editing.

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Correspondence to Mahmoud Mazarji.

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It is not applicable since the manuscript has not been involved in the use of any animal or human data or tissue.

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Minkina, T., Vasilyeva, G., Popileshko, Y. et al. Sorption of benzo[a]pyrene by Chernozem and carbonaceous sorbents: comparison of kinetics and interaction mechanisms. Environ Geochem Health 44, 133–148 (2022). https://doi.org/10.1007/s10653-021-00945-8

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  • DOI: https://doi.org/10.1007/s10653-021-00945-8

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