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Magnetic Sulfide–Modified MFe2O4/Montmorillonite (M=Fe, Zn) for Efficient Sorption of Cd(II)

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Abstract

Modified montmorillonite has been widely used for the adsorption of heavy metal Cd(II), but there are few studies on the preparation of adsorbents that are easy to recover and can be efficiently adsorbed. In this paper, magnetic S-MFe2O4/MMT (M=Fe, Zn) composites with huge specific surface multi-class functional groups were prepared on montmorillonite loaded with Zn and S doubly-modified Fe3O4 to explore its performance in Cd(II)-contamination, to reveal the removal mechanism of Cd contamination, and to evaluate the stabilization effect of S-MFe2O4/MMT (M=Fe, Zn). The results showed that the optimum adsorption pH of S-ZnFe2O4/MMT for single Cd(II) was 6.0, the maximum adsorption was 56.68 mg·g−1, and the adsorption process was by the quasi-secondary kinetic model and Langmuir isothermal adsorption model. In addition, the effects of the coexistence of Cr3+, Ni2+, and Pb2+ on the adsorption performance of Cd(II) were not significant, and the adsorption of Cd(II) remained above 55.70 mg·g−1 and showed better adsorption of Pb2+ (98.20 mg·g−1) and Cr3+ (92.78 mg·g−1). In conclusion, the composites can be used as an effective remediation reagent for Cd(II)-contaminated soil.

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Author Contributions

Yan Lei: data analysis, writing—original draft. Tingting Huo, Huanbo Wang: conceptualization, supervision, writing—review, and editing. Tunan Yin: read, corrected, and revised the manuscript. Xin Xiao: writing—review and editing. Yuancong Ma: writing—review and editing. Mengqing Liu: data analysis, writing—review and editing. All authors read and approved the final manuscript.

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The data that support the findings of this study are available from the corresponding author upon reasonable request.

Funding

This work was supported by the Nature Science Foundation of Sichuan Province (2022NSFSC1223) and the National Natural Science Foundation of China (42007281).

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Correspondence to Tingting Huo.

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The authors declare no competing interests.

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Highlights

• S-ZnFe2O4/MMT composites were successfully fabricated by hydrothermal synthesis of Fe3O4 modified by both Zn and S.

• S-ZnFe2O4/MMT composites showed a significant increase in the adsorption of Cd(II).

• The adsorption performance of the composites on Cd(II) was less affected by the coexistence of multiple cations.

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Lei, Y., Huo, T., Yin, T. et al. Magnetic Sulfide–Modified MFe2O4/Montmorillonite (M=Fe, Zn) for Efficient Sorption of Cd(II). Water Air Soil Pollut 235, 82 (2024). https://doi.org/10.1007/s11270-023-06876-7

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  • DOI: https://doi.org/10.1007/s11270-023-06876-7

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