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Influence of soil organic components on the aniline adsorption mechanism

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Abstract

Hydrophobic organic compounds (HOCs) exhibit strong hydrophobicity and low water solubility and are readily adsorbed into soil, which is a complex organic compound. In this study, the adsorption effect and mechanism of 10 soil organic matter components on HOCs (represented by aniline) are studied. Furthermore, a chemical extraction method is used to extract different soil organic components to study their properties and functional groups. The adsorption kinetic experiment is conducted to determine the equilibrium time of aniline. The isothermal adsorption experiment is conducted to determine the isothermal adsorption model of aniline and explore its characteristics. Results show that different components have various physical and chemical properties. The pseudo-quadratic kinetic model fitted well with experimental data, indicating that the adsorption of aniline reached equilibrium within 24 h. The Freundlich model fits the isotherm adsorption data of aniline, revealing that the adsorption capacity is significantly positively correlated with the organic carbon content and specific surface area. This study shows that humic acid 2 has the best adsorption capacity for aniline. This study enables the prediction of environmental risks posed by HOCs such as aniline.

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The data that support this study are available in the article and accompanying online supplementary material.

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Acknowledgements

The authors are grateful to Dr. Yingchen Bai and Dr. Fujun Ma for their valuable suggestions. Y. Ma thanks the China Scholarship Council (CSC) for supporting her one-year study at UMass Amherst.

Funding

This research was financially supported by the National Natural Science Funds of China [Grant number 41701353], the Yue Qi Young Scholar Project at China University of Mining & Technology in Beijing [Grant number 2019QN09], and the Fundamental Research Funds for the Central Universities [Grant number 2020SKHH01]. The funders had no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the paper for publication.

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Correspondence to L. Bowen.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Editorial responsibility: Jing Chen.

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Yan, M., Lu, C., Shengji, A. et al. Influence of soil organic components on the aniline adsorption mechanism. Int. J. Environ. Sci. Technol. 20, 12117–12130 (2023). https://doi.org/10.1007/s13762-023-04773-4

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  • DOI: https://doi.org/10.1007/s13762-023-04773-4

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