Abstract
Complexes formed by organic matter and clay minerals, which are active components of soil systems, play an important role in the migration and transformation of pollutants in nature. In this study, humic-acid–montmorillonite (HA–MT) and humic-acid–kaolin (HA–KL) complexes were prepared, and their structures before and after the adsorption of aniline were analyzed. The aniline adsorption–desorption characteristics of complexes with different clay minerals and varying HA contents were explored using the static adsorption–desorption equilibrium method. Compared with the pristine clay minerals, the flaky and porous structure of the complexes and the aromaticity were enhanced. The adsorption of aniline on the different clay mineral complexes was nonlinear, and the adsorption capacity increased with increasing HA content. Additionally, the adsorption capacity of HA–MT was higher than that of HA–KL. After adsorption, the specific surface area of the complexes decreased, the surfaces became more complicated, and the aromaticity decreased because aniline is primarily adsorption onto the complexes via aromatic rings. Aniline was adsorbed onto the complexes via spontaneous exothermic physical adsorption. The amount of aniline desorbed from the complexes increased with increasing HA content, and a lag in desorption was observed, with a greater lag for HA–KL than for HA–MT.
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All data and materials generated or analyzed during this study are available from the corresponding author upon reasonable request.
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Acknowledgements
We appreciate the efforts of all the researchers whose articles were included in this study. The authors would like to thank the editor and anonymous reviewers for their constructive comments and suggestions for improving the manuscript.
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This work was supported by the National Natural Science Foundation of China [grant number 41701353]; the Yue Qi Young Scholar Project, China University of Mining & Technology, Beijing [grant number 2019QN09]; and the National Innovative Experiment Program for College Students of China [grant number 202103050].
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All authors contributed to the study’s conception and design. Methodology, project administration, and writing – review and editing – were performed by Yan Ma. Investigation, methodology, and writing – original draft – were performed by Xinyi Wu. Investigation, material preparation, data collection, and analysis were performed by Tong Wang. Investigation and writing – review and editing – were performed by Shengkun Zhou. Methodology and visualization were performed by Biying Cui. Investigation and writing – review and editing – were performed by Haoqun Sha. Conceptualization, formal analysis, and supervision were performed by Bowen Lv.
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Ma, Y., Wu, X., Wang, T. et al. Elucidation of aniline adsorption–desorption mechanism on various organo–mineral complexes. Environ Sci Pollut Res 30, 39871–39882 (2023). https://doi.org/10.1007/s11356-022-25096-w
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DOI: https://doi.org/10.1007/s11356-022-25096-w