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High-efficiency Hg(II) adsorbent: FeS loaded on a carbon black from pyrolysis of waste tires and sequential reutilization as a photocatalyst

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Abstract

Iron-sulfur nano compounds have been proven to be effective in mercury removal, but the agglomeration, poor dispersion and mobility, and easy oxidation challenges limit their application. Herein, carbon black originating from pyrolysis of waste tires was used as a carrier of nano-FeS to obtain an efficient adsorbent (C@PDA-FeS). It is found that the C@PDA-FeS shows outstanding adsorption ability, excellent selectivity, and high removal rate. A maximum adsorption capacity of 1754 mg/g is obtained, and the residual Hg(II) ion concentration is as low as 3.2 μg/L in the simulated industrial wastewater, which meets the industrial discharge standard under the optimal conditions. Meanwhile, the removal rate of Hg(II) ion can reach 99.8% after up to 10 cycles. More importantly, the C@PDA-FeS still shows good adsorption efficiency, and the removal rate of Hg(II) ion is over 99% (25 mg/L Hg(II) concentration) after 90 days of storage, demonstrating the long-term stability and promising future of the adsorbent. In addition, the waste adsorbent (C@PDA-FeS/HgS) is reused as a photocatalyst to degrade methylene blue, and the corresponding degradation rate is 92.9% (10 mg/L).

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The data sets used and analyzed during the study are available from the corresponding author on reasonable request.

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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 the Fundamental Research Funds for the Central Universities (N2105005) and Guiding Project of Fujian Province Science and Technology Department (2022Y0076).

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All authors were involved in the conception and design of the study. Materials were prepared and analyzed by CJ, JH, CY, FC, and YF. Data collection was done by CJ. The first draft of the manuscript was co-authored by CJ and JH, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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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. High-efficiency Hg(II) adsorbent: FeS loaded on a carbon black from pyrolysis of waste tires and sequential reutilization as a photocatalyst. Environ Sci Pollut Res 29, 84287–84299 (2022). https://doi.org/10.1007/s11356-022-21572-5

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  • DOI: https://doi.org/10.1007/s11356-022-21572-5

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