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Highly efficient and selective Hg(II) adsorbent: ZnS grown on the surface of 4A zeolite and supported on starch aerogels

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Abstract

In this study, ZnS nanoparticles were loaded on the surface of zeolite NaA and embedded in a carbon aerogel to prepare C@zeolite-ZnS, where zeolite NaA was used in order to adsorb Zn2+ ions released during ion exchange, and the carbon aerogel had good dispersion as a carrier for ZnS to solve the ZnS agglomeration problem. The morphology and structure of C@zeolite-ZnS were characterized by FT-IR, XRD, SEM, BET, and XPS. C@zeolite-ZnS showed excellent selectivity and high removal rate for Hg(II) ions with a maximum adsorption capacity of 795.83 mg/g. When the pH, adsorption time, and Hg(II) ion concentration were 6, 30 min, and 25 mg/L at 298 K, the corresponding adsorption and removal rates reached 99.90% and 124.88 mg/g, respectively. Thermodynamic studies have shown that the adsorption process is a spontaneous heat absorption process. Furthermore, after up to 10 cycles of adsorption, the adsorbent still exhibited outstanding stability and high adsorption capacity with removal rates exceeding 99%. In conclusion, C@zeolite-ZnS, which is stable and reusable and has the ability to meet industrial emission standards after adsorption of Hg(II) ions, is very promising for industrial applications.

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Acknowledgements

We sincerely thank the editors and anonymous reviewers for their important comments and suggestions to improve the quality of the study.

Funding

This work was supported by Guiding Project of Fujian Province Science and Technology Department (2022Y0076) and Fujian Marine Economic Development Special project (FJHJF-L-2022-21).

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Chuanzhi Jiang: conceptualization, writing original draft, and visualization. Chengyue Yang and Yong Fu: conceptualization and writing original draft. Feng Chen: writing, review, and editing. Jianshe Hu: supervision, writing, review, and editing.

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Correspondence to Jianshe Hu.

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Responsible Editor: George Z. Kyzas

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Jiang, C., Yang, C., Fu, Y. et al. Highly efficient and selective Hg(II) adsorbent: ZnS grown on the surface of 4A zeolite and supported on starch aerogels. Environ Sci Pollut Res 30, 67059–67070 (2023). https://doi.org/10.1007/s11356-023-27107-w

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  • DOI: https://doi.org/10.1007/s11356-023-27107-w

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