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Efficient removal of Hg2+ by L-cysteine and polypyrrole-functionalized magnetic kaolin: condition optimization, model fitting and mechanism

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Abstract

To enhance the adsorption capacity and improve agglomeration properties of kaolin during the adsorption process of Hg2+ from aqueous solution, kaolin was bi-functionally modified using L-cysteine and polypyrrole. The as-synthetized adsorbent of L-Ppy-Fe3O4/kaolin was characterized before and after modification. The removal conditions were optimized by response surface methodology, and the optimized results show that the optimal adsorption capacity of Hg2+ reaches 482.71 mg/g at pH of 7.9, temperature of 315 K, initial concentration of 40 mg/L and dosage of 0.05 g/L. And the effects of adsorption conditions on Hg2+ removal follow the order of solution pH > temperature > initial concentration > dosage. The adsorption process of Hg2+ in aqueous solution can be well described by pseudo-second-order kinetic model and Langmuir isothermal model. Moreover, the thermodynamic fitting indicates that the adsorption of Hg2+ is an endothermic and spontaneous process. The adsorption mechanism of Hg2+ onto L-Ppy-Fe3O4/kaolin is mainly the complexation between divalent Hg2+ and sulfhydryl/amino groups to form stable metal complexes, and electrostatic attraction is also a part of the reaction mechanism. In addition, L-Ppy-Fe3O4/kaolin is proved to have satisfactory dispersion ability and chemical stability and can be easily separated and recovered after adsorption in aqueous solution. Therefore, L-Ppy-Fe3O4/kaolin is a promising adsorbent for the efficient removal of mercury ions.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (51578354) and Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX21_3037), and Production-Study-Research Pre-research fund of Zhangjiagang Science and Technology Bureau (ZKCXY2113). The authors also appreciate the support from Mr. Hongjie Cao (Jiangsu Ruoyan Environmental Design Co., Ltd.) for the characterization of materials.

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  1. Yanming Xu and Shuyuan Zhang contribute equally to this work.

Authors and Affiliations

  1. Department of Municipal Engineering, Suzhou University of Science and Technology, Suzhou, Jiangsu, 215009, China

    Yanming Xu, Shuyuan Zhang, Yuhao Zhao, **g**g Yang, Shusu Shen, Ganwei Zhang, Yongfu Guo & **nyu Zheng

  2. Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou, Jiangsu, 215009, China

    Yongfu Guo

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  1. Yanming Xu
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Xu, Y., Zhang, S., Zhao, Y. et al. Efficient removal of Hg2+ by L-cysteine and polypyrrole-functionalized magnetic kaolin: condition optimization, model fitting and mechanism. Res Chem Intermed 48, 4287–4311 (2022). https://doi.org/10.1007/s11164-022-04794-7

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