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Growth of rGO nanostructures via facile wick and oil flame synthesis for environmental remediation

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Abstract

Oil spills into ocean or coastal waters can result in significant damage to the environment via pollution of aquatic ecosystems. Absorbents based on reduced graphene oxide (rGO) foams have the capacity to remove minor or major oil spills. However, conventional chemical synthesis of rGO often uses petrochemical precursors, potentially harmful chemicals, and requires special processing conditions that are expensive to maintain. In this work, an alternative cost-effective and environmentally friendly approach suitable for large-scale production of high-quality rGO directly from used cooking sunflower oil is discussed. Thus, produced flaky graphene structures are effective in absorbing used commercial sunflower oil and engine oil, via monolayer physisorption in the case of used sunflower and engine oils facilitated by van der Waals forces, π–π stacking and hydrophobic interactions, π-cation (H+) stacking and radical scavenging activities. From adsorption kinetic models, first-order kinetics provides a better fit for used sunflower oil adsorption (R2 = 0.9919) and second-order kinetics provides a better fit for engine oil adsorption (R2 = 0.9823). From intra-particle diffusion model, R2 for USO is 0.9788 and EO is 0.9851, which indicates that both used sunflower and engine oils adsorption processes follow an intra-particle diffusion mechanism. This study confirms that waste-derived rGO could be used for environmental remediation.

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Authors and Affiliations

  1. Centre for Nanoscience and Technology, Anna University, Chennai, 600025, India

    G. S. Lekshmi, R. Tamilselvi & Mandhakini Mohandas

  2. Faculty of Science and Engineering, Queensland University of Technology, Brisbane, QLD, 4000, Australia

    Karthika Prasad

  3. School of Science, RMIT University, PO Box 2476, Melbourne, VIC, 3001, Australia

    Olha Bazaka

  4. Plasma Sources and Application Centre/Space Propulsion Centre Singapore, NIE, Singapore, 637616, Singapore

    Igor Levchenko & Kateryna Bazaka

  5. School of Engineering, The Australian National University, Canberra, ACT, 2601, Australia

    Igor Levchenko & Kateryna Bazaka

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  1. G. S. Lekshmi
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Lekshmi, G.S., Tamilselvi, R., Prasad, K. et al. Growth of rGO nanostructures via facile wick and oil flame synthesis for environmental remediation. Carbon Lett. 31, 763–777 (2021). https://doi.org/10.1007/s42823-021-00244-3

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