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Facile preparation of MgO/graphene oxide nanocomposite for efficient removal of aqueous Congo red: adsorption performance and interaction mechanism

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Abstract

Aqueous dyes are important source of water pollution. In this work, a nanocomposite MgO/graphene oxide (MgO/GO) was prepared with a simple solvothermal method. The as-prepared MgO/GO was characterized and employed as a potential adsorbent to remove aqueous Congo red (CR). The interaction mechanism between MgO/GO and CR was clarified. The adsorption of CR (initial concentration 700 mg L−1) onto MgO/GO (dosage 1000 mg L−1) equilibrated in 10 min, adsorption percent and adsorption quantity were 97.84% and 684.85 mg g−1, respectively. Compared with other adsorbents, MgO/GO was superior in adsorption efficiency due to the fast adsorption kinetics. Moreover, MgO/GO exhibited good adaptability to the fluctuations of environmental factors including CR initial concentration and coexisting electrolyte. The adsorption fits well with the Freundlich model and PSO model; chemical adsorption was the rate-controlling step. Both GO and MgO in MgO/GO contributed to CR adsorption. GO adsorbed CR via an electrostatic attraction and face-to-face π–π interaction, MgO adsorbed CR via weak van der Waals force. Owing to the advantages as facile preparation, high adsorption efficiency, and good environmental adaptability, MgO/GO may be a promising adsorbent for aqueous dyes.

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Acknowledgements

This work was financially supported by the project for opening and sharing of large instruments for detection, promotion, and innovation of Inner Mongolia Autonomous Region, China (0406031901).

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Authors and Affiliations

  1. College of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou, 014010, People’s Republic of China

    Ting Guo

  2. College of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou, 014010, People’s Republic of China

    Chaoke Bulin

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  1. Ting Guo
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  2. Chaoke Bulin
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Ting Guo was involved in formal analysis, investigation, data curation, supervision, validation, and project administration. Chaoke Bulin performed conceptualization, writing—original draft, writing—review & editing, visualization, resources, and funding acquisition.

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Correspondence to Chaoke Bulin.

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Guo, T., Bulin, C. Facile preparation of MgO/graphene oxide nanocomposite for efficient removal of aqueous Congo red: adsorption performance and interaction mechanism. Res Chem Intermed 47, 945–971 (2021). https://doi.org/10.1007/s11164-020-04310-9

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