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Preparation of sulfur self-doped coal-based adsorbent and its adsorption performance for Cu2+

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Abstract

The limited application of high-sulfur coal (HSC) and the increasing severity of copper pollution in solution are two pressing issues. To alleviate such issues, a sulfur self-doped coal-based adsorbent (HSC@ZnCl2) was obtained by pyrolysis (850 °C, 60 min holding time) of HSC and ZnCl2 with a mass ratio of 1:0.5. The results adsorption experiment revealed that the endothermic and spontaneous adsorption process was consistent with the Sips isothermal model (R2 = 0.992) and pseudo-second-order kinetic (R2 = 0.994), and that the adsorption process with a maximum adsorption capacity of 11.97 mg/g. Meanwhile, the adsorption of Cu2+ onto HSC@ZnCl2 was a result of the synergistic effects of various interactions, such as the complexation by oxygen-containing functional groups, electrostatic attraction and surface precipitation by ZnS on the adsorbent surface, and the process also included redox reaction. The findings of this work indicate that the preparation of sulfur self-doped coal-based adsorbent prepared from high-sulfur coal is a promising method for its large-scale utilization.

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Funding

This work was supported by the financial support from the National Natural Science Foundation of China (grant number 52104274), Natural Science Foundation of Jiangsu Province (grant number BK20210498), and China Postdoctoral Science Foundation (grant number 2021M693420 and 2022T150700).

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Dengke Lei: methodology, data curation, formal analysis, investigation, writing—original draft; Shulei Li: conceptualization, formal analysis, supervision, project administration, funding acquisition; Lihui Gao: supervision, project administration, funding acquisition, writing—review and editing; Ming Hu: resources, investigation; Na Chai: resources, investigation; Jundi Fan: software, investigation.

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Correspondence to Shulei Li.

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Lei, D., Li, S., Gao, L. et al. Preparation of sulfur self-doped coal-based adsorbent and its adsorption performance for Cu2+. Environ Sci Pollut Res 30, 115543–115555 (2023). https://doi.org/10.1007/s11356-023-30529-1

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  • DOI: https://doi.org/10.1007/s11356-023-30529-1

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