Abstract
The development of effective and practical adsorbents for eliminating pollutants still remains a significant challenge. Herein, we synthesized a novel magnetically separable composite, Co0.6Fe2.4O4/MIL-101-NH2, through the in-situ growth of MIL-101-NH2 on magnetic nanoparticles, designed specifically for the removal of Congo red (CR) from aqueous solutions. MIL-101-NH2 possessed high BET surface area (240.485 m2•g−1) and facile magnetic separation function and can be swiftly separated (within 30 s) through an external magnetic field post-adsorption. The investigation systematically explored the influence of crucial parameters, including adsorbent dosage, pH, adsorption duration, temperature, and the presence of interfering ions, on CR adsorption performance. Findings indicate that CR adsorption adheres to the pseudo-second-order (PSO) kinetic model and the Langmuir isotherm model. Thermodynamic analysis reveals the spontaneity, endothermic nature, and orderly progression of the adsorption process. Remarkably, the adsorbent with 0.1 g•L−1 boasts an impressive maximum adsorption capacity of 1756.19 mg•g−1 for CR at 298.15 K, establishing its competitive advantage. The reuse of the adsorbent over 5 cycles remains 78% of the initial adsorption. The CR adsorption mechanisms were elucidated, emphasizing the roles of π-π interactions, electrostatic forces, hydrogen bonding, and metal coordination. Comparison with other dyes, such as methylene blue (MB) and methyl orange (MO), and exploration of adsorption performance in binary dye systems, demonstrates the superior capacity and selectivity of this adsorbent for CR. In conclusion, our magnetically separable metal–organic framework (MOF)based composite presents a versatile and effective solution for CR removal, with promising applications in water treatment and environmental remediation.
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Data available on request from the authors. The data that support the findings of this study are available from the corresponding author, [Li Houbin], upon reasonable request.
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The authors are grateful for constructive feedback from reviewers that helped improve an earlier version of the manuscript.
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This work was supported by the National Natural Science Foundation of China (grant number: U1830127).
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All authors contributed to the study conception and design. Conceptualization and investigation were completed by Zhenhong Zhang and Yuye Zhong. Material preparation, data collection, and analysis were performed by Zhenhong Zhang, Yuye Zhong, and Peng Sun. Review and editing were performed by Pingping Zhao, Houbin Li, and Xinghai Liu. The first draft of the manuscript was written by Zhenhong Zhang. Zhenhong Zhang and Yuye Zhong contributed equally to this work and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Highlights
• The magnetic adsorbent with embedded structure is compounded by in-situ growth.
• The Langmuir isotherm shows the high adsorption capacity of Co0.6Fe2.4O4/MIL-101-NH2 for Congo red (up to 1756.19 mg•g−1) at 298.15 K.
• The excellent separability and reusability of the adsorbent show its practicability and industrialization feasibility.
• Co0.6Fe2.4O4/MIL-101-NH2 has strong adsorption performance in complicated environments due to its selectivity for Congo red.
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Zhang, Z., Zhong, Y., Sun, P. et al. Magnetically separable Co0.6Fe2.4O4/MIL-101-NH2 adsorbent for Congo red efficient removal. Environ Sci Pollut Res 31, 9764–9783 (2024). https://doi.org/10.1007/s11356-023-31796-8
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DOI: https://doi.org/10.1007/s11356-023-31796-8