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Capturing Cu2+ and recycling spent Cu-adsorbents as catalyst for eliminating Rhodamine B: reactivity and mechanism

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Abstract

The thorny problem of adsorption is the disposing of spent adsorbent. In this manuscript, the exhaust adsorbent of efficient capture Cu(II) over ZSM-5 that supported zero-valent iron (nZVI) was reused as a catalyst for eliminating Rhodamine B (RhB). Batch experiments were used to evaluate the removal performance of Cu2+ and RhB. The results demonstrated that the Cu2+ adsorption process obeyed pseudo-second-order kinetics, and the adsorption performance was dependent on solution pH. The maximum adsorption capacity at the optimal pH 4.0 was 375.9 mg/g; equilibrium was reached rapidly within 35 min. From XPS, the reduction-oxidation between Fe0 and Cu2+ was occurred in the adsorption process, and Fe2+, Fe3+, and Cu0 was formed. In the recycling experiments, RhB was removed by the spent Cu adsorbent, with the removal performance being dependent on the initial Cu concentration, in the order of 5 mg/L > 20 mg/L > 0 mg/L > 100 mg/L > 500 mg/L. RhB removal also improved with increasing H2O2 concentration. More than 99.9% of the RhB was degraded within 8 min using 1.75 mM H2O2, which was a large improvement over the previously used catalyst. The hydroxyl radical was found to be the main free radical responsible for RhB degradation.

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Acknowledgements

We gratefully acknowledge the support of this work by the Natural Science Foundation of Guangxi Minzu University (Grant No: 2022KJQD27), the Natural Science Foundation of China (Grant No: 22066013), and the Young Academic Raising Team Foundation of Guangxi Minzu University (Grant No: 2022GXUNXSHQN03).

Funding

Natural Science Foundation of Guangxi Minzu University (Grant No: 2022KJQD27), Natural Science Foundation of China (Grant No: 22066013), and Young Academic Raising Team Foundation of Guangxi Minzu University (Grant No: 2022GXUNXSHQN03).

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Writing—original draft and data analysis: Jing Xie; experiment, writing–original draft, conceptualization, validation, and conceptualization: Caiyun Han; writing—reviewing and editing: Qin Shi; investigation and writing—reviewing: Liying Liang; experiment, methodology, and software: Ting Yang; characterization, analysis, and writing—reviewing: Sufang He. All authors read and approved the final manuscript.

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Correspondence to Caiyun Han.

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Written informed consent for publication of this paper was obtained from the Guangxi Minzu University and all authors. We confirm that this manuscript is approved by all authors for publication, and publication has been approved by all co-authors and the responsible authorities at the institute where the work has been carried out.

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The authors declare no competing interests.

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Responsible Editor: George Z. Kyzas

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Han, ., Xie, J., Shi, Q. et al. Capturing Cu2+ and recycling spent Cu-adsorbents as catalyst for eliminating Rhodamine B: reactivity and mechanism. Environ Sci Pollut Res 30, 110352–110362 (2023). https://doi.org/10.1007/s11356-023-29942-3

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  • DOI: https://doi.org/10.1007/s11356-023-29942-3

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