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Removing Efficiency and Mechanism of Ciprofloxacin from Aqueous Solution Using Rectorite

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Abstract

This work found that rectorite (REC) has a good adsorption effect on cationic pollutants such as ciprofloxacin (CIP), with a maximum adsorption capacity of 79.73 mg/g for CIP. The zeta potential analysis showed that the electronegativity of the REC surface would be weakened after CIP adsorption under acidic conditions. Through adsorption kinetics, isotherm study, XRD, FTIR, and other characterizations, the phenomenon of reduced negative charge on the surface of REC adsorbed with CIP under acidic conditions was explained. Based on the Langmuir and Temkin models, the adsorption process of CIP on REC is a spontaneous endothermic adsorption process. The adsorption kinetics can be better described using a pseudo-second-order model, indicating that the adsorption rate is mainly controlled by chemical adsorption. The characterization further proved that REC adsorbed ciprofloxacin mainly through hydrogen bonding, cation exchange, and electrostatic gravitational interaction. CIP, as an emerging contaminant discharged into the water environment, will be harmful to the ecological environment and human health. Therefore, the utilization of REC for the removal of CIP from an aqueous solution has potential prospects.

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All data generated or analyzed during this study are included in this article.

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Funding

The authors would like to thank the financial support from the National Natural Science Foundation of China (No. 51708427).

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Dan Su: did the experiments, collected the data, contributed data or analysis tools, performed the analysis, and wrote the initial draft. Jingyi Huang Yang Li and Lin Chen conceived and designed the analysis and performed the analysis. Yingru Wang designed the experiments, revised the manuscript, and funded the acquisition.

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Correspondence to Yingru Wang.

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Su, D., Huang, J., Li, Y. et al. Removing Efficiency and Mechanism of Ciprofloxacin from Aqueous Solution Using Rectorite. Water Air Soil Pollut 235, 271 (2024). https://doi.org/10.1007/s11270-024-07070-z

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  • DOI: https://doi.org/10.1007/s11270-024-07070-z

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