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Preparation of basic magnesium carbonate nanosheets modified pumice and its adsorption of heavy metals

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Abstract

Heavy metal pollution in wastewater poses a grave danger to the environment and the human body. Pumice is a mineral with abundant reserves and low prices, and its prospect of heavy metal adsorbent is very broad. In this work, we modified pumice with basic magnesium carbonate nanosheets by a convenient hydrothermal synthesis. The adsorption capacity of heavy metals is greatly improved. The effects of different pH and adsorption dosages are investigated. All the optimum pH values for Cu2+, Pb2+, and Cd2+ are 5. The adsorption of three kinds of ions conforms to the quasi-second-order adsorption kinetics model. The theoretical adsorption capacities of Cu2+, Pb2+, and Cd2+, which are calculated by the Langmuir model, are 235.29 mg/L, 595.24 mg/L, and 370.34 mg/L, respectively. The adsorption of Cu2+ and Cd2+ fit the Langmuir model better. The Freundlich model is fitted well with the adsorption of Pb2+. In the experiment simulating real wastewater, the adsorption capacity of heavy metals is not affected. It also shows good reusability in three regeneration cycles. And Mg5(CO3)4(OH)2·4H2O@pumice adsorption column showed the good removal efficiency of three heavy metals at different concentrations and different spatial velocities in the column experiment. Thus, it is believed that the Mg5(CO3)4(OH)2·4H2O@pumice is a promising adsorbent for the efficient removal of heavy metals.

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Funding

This work was supported in part by the project of National Key Research and development (No. 2019YFC0408504), Natural Science Foundation of Anhui Province (No. 2008085MB44), Natural Science Research Project of Anhui Educational Committee (No. 2022AH040046), and Quality engineering project of colleges and universities in Anhui Province (No. 2020kfkc263).

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Conceptualization: Yong Zhang and Zhen Jin; methodology: Yong Zhang, Yi-Fan Xiao, Guang-Song Xu, and Min-Da Xu; formal analysis and investigation: Yi-Fan Xiao, Guang-Song Xu, Min-Da Xu, De-Cai Wang, and Jia-Qi Liu; writing—original draft preparation: Yong Zhang, Yi-Fan Xiao, Zhen Jin, Guang-Song Xu, Min-Da Xu, and De-Cai Wang; writing—review and editing: Yi-Fan Xiao, Min-Da Xu, De-Cai Wang, and Zhen Jin; funding acquisition: Yong Zhang and Zhen Jin; resources: Min-Da Xu, De-Cai Wang, and Li–Li Yang; visualization: Yi-Fan Xiao, Jia-Qi Liu, and Li–Li Yang; validation: Jia-Qi Liu and Li–Li Yang; supervision: Yong Zhang and Zhen Jin.

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Correspondence to Zhen Jin.

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Zhang, Y., Xiao, YF., Xu, GS. et al. Preparation of basic magnesium carbonate nanosheets modified pumice and its adsorption of heavy metals. Environ Sci Pollut Res 30, 111137–111151 (2023). https://doi.org/10.1007/s11356-023-30023-8

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  • DOI: https://doi.org/10.1007/s11356-023-30023-8

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