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A novel in-situ synthesis of magnetic graphene nanocomposites by Fe2(SO4)3 intercalation for removal of congo red from water: adsorption investigation and mechanism insights

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Abstract

A novel magnetic graphene nanocomposites (MGN) was fabricated via a environment-friendly electrochemical exfoliation in Fe2(SO4)3 aqueous solutions. Ferrous sulfate in the electrolyte had the potential to enhance both the exfoliation efficiency of graphite and the in-situ magnetization of graphene. The as-obtained MGN-700 °C was explored as an adsorbent for the removal of Congo red (CR) from aqueous solutions. The adsorption equilibrium was rapidly achieved in 20 min, and the kinetic adsorption was well fitted with the pseudo-second-order kinetic model. Meanwhile, the adsorption isotherms followed the Freundlich model with a maximum capability of 582 mg g−1 for CR. Moreover, thermodynamic study indicated that the adsorption process was spontaneous and exothermic. Characterizations of the adsorbent suggested that the adsorption mechanisms of CR onto MGN-700 °C mainly involved hydrogen bond, electrostatic interaction and π–π stacking. After five cycles of adsorption/desorption, the removal efficiency of CR onto MGN-700 °Cremained at approximately 80%, demonstrating its excellent reusability. Furthermore, the adsorbent exhibited high adsorption capacity and a ferromagnetic feature, indicating its potential practical application in dye wastewater treatment.

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Acknowledgements

This work was supported by Basic Scientific Research Program of Liaoning Education Department (LJKZ1200, LJKZ1197), Liaoning Key Laboratory of Chemical Additive Synthesis and Separation (ZJNK2108), Liaoning Provincial Engineering Research Center for High-Value Utilization of Magnesite (LMNKY202301), Regional Joint Fund of Liaoning Provincial Department of Science and Technology (2022-YKLH-06) and High-level talents program of YKIT (YJRC202102).

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Authors and Affiliations

  1. Liaoning Key Laboratory of Chemical Additive Synthesis and Separation, Yingkou Institute of Technology, Yingkou, 115014, China

    Zhishuang Xue, Xinzhong Deng, Hai Liang, Qiuyang Chen, Jie Zhao, Guanlin Lv, Xiuyuan Zuo & Guofeng Du

  2. Liaoning Provincial Engineering Research Center for High-Value Utilization of Magnesite, Yingkou, 115014, China

    Zhishuang Xue, Xinzhong Deng, Hai Liang & Xiuyuan Zuo

  3. College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang, 110142, China

    Sansan Yu

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  1. Zhishuang Xue
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Contributions

ZX contributed to writing-original draft, investigation, conceptualization, supervision and funding acquisition. XD contributed to conceptualization, writing-review & editing, supervision and funding acquisition. HL contributed to experimental design and formal analysis. QC, JZ and GL contributed to material preparation and data collection. XZ contributed to formal analysis and investigation. GD contributed to investigation. SY contributed to writing-review & editing and supervision.

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Xue, Z., Deng, X., Liang, H. et al. A novel in-situ synthesis of magnetic graphene nanocomposites by Fe2(SO4)3 intercalation for removal of congo red from water: adsorption investigation and mechanism insights. J Mater Sci 59, 8235–8254 (2024). https://doi.org/10.1007/s10853-024-09691-5

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