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Highly selective adsorption of Hg (II) from aqueous solution by three-dimensional porous N-doped starch-based carbon

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Abstract

For the first time, N-doped carbon materials with 3D porous–layered skeleton structure was synthesized through a one-step co-pyrolysis method, which was fabricated by co-pyrolysis of natural corn starch and melamine using metal catalysts (Ni (II) and Mn (II)). The 3D-NC possessed a heterogeneously meso-macroporous surface with a hierarchically connected sheet structure inside. Batch adsorption experiments suggested that highly selective adsorption of Hg (II) by the 3D-NC could be completed within 90 min and had maximum adsorption capacities as high as 403.24 mg/g at 293 K, pH = 5. The adsorption mechanism for Hg (II) was carefully evaluated and followed the physical adsorption, electrostatic attraction, chelation, and ion exchange. Besides, thermodynamic study demonstrated that the Hg (II) adsorption procedure was spontaneous, endothermic, and randomness. More importantly, the 3D-NC could be regenerated and recovered well after adsorption–desorption cycles, showing a promising prospect in the remediation of Hg (II)-contaminated wastewater.

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Funding

We are deeply grateful for the support of National Natural Science Foundation of China (No. 21705084), and the Natural Science Foundation of Shandong Province of China (No. ZR2017BB074), the Science, Education and Industry Integration Project of Qilu University of Technology (No. 2022PY070), National Training Program of Innovation and Entrepreneurship for Undergraduates (No. S202010431027), Qilu University of Technology of Training Program of Innovation and Entrepreneurship for Undergraduates (No. xj201910431125), Major Innovation Pilot Project of Integration of Science, Education and Industry of Qilu University of Technology (Shandong Academy of Science) (No. 2022JBZ01-08), Innovation Pilot Project of Integration of Science, Education and Industry (No. 2020KJC-ZD06), Research Leader Workshop of Jinan (2021GXRC101), Key Research and Development Program of Shandong Province (No. 2021CXGC010808), the Innovation Team of Jinan City (2018GXRC004), and Special Funds for Taishan Scholars Project.

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  1. State Key Laboratory of Biobased Material and Green Papermaking, School of Food Science and Engineering, Qilu University of Technology, Shandong Academy of Sciences, Jinan, 250353, China

    Chao Geng, Ruikang Lin, Peilin Yang, Pengfei Liu, Li Guo, Bo Cui & Yishan Fang

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  1. Chao Geng
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  2. Ruikang Lin
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Contributions

Chao Geng: conceptualization, investigation, experimental operation, analysis of the samples data, writing—original draft. Ruikang Lin: conceptualization, investigation, supervision. PeiLin Yang: investigation, supervision, measurement, and analysis the sample. Li Guo: conceptualization, investigation, data curation. Pengfei Liu: conceptualization, investigation, data curation. Bo Cui: funding acquisition, supervision. Yishan Fang: writing—review and editing, funding acquisition, supervision. All authors read and approved the final manuscript.

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Correspondence to Yishan Fang.

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Geng, C., Lin, R., Yang, P. et al. Highly selective adsorption of Hg (II) from aqueous solution by three-dimensional porous N-doped starch-based carbon. Environ Sci Pollut Res 30, 52107–52123 (2023). https://doi.org/10.1007/s11356-023-26002-8

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