Journal
RESEARCH ON CHEMICAL INTERMEDIATES
Volume 47, Issue 3, Pages 945-971Publisher
SPRINGER
DOI: 10.1007/s11164-020-04310-9
Keywords
Magnesium oxide; Graphene oxide; Congo red; Adsorption; Interaction mechanism
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Funding
- project for opening and sharing of large instruments for detection, promotion, and innovation of Inner Mongolia Autonomous Region, China [0406031901]
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The study prepared a MgO/GO nanocomposite as an adsorbent for the aqueous dye Congo red, showing fast adsorption kinetics, high adsorption efficiency, and strong adaptability to environmental fluctuations.
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 pi-pi 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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