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Chapter 6

Graphene-based Sorbents for Modern Magnetic Solid-phase Extraction Techniques

Graphene (G) is a cutting-edge two-dimensional material, with a strong non-polar and hydrophobic character. Its honeycomb structure, of sp2-hybridized carbon atoms, confers graphene sorbents with attractive retention and extraction capabilities for carbon-based ring structures. In recent years, graphene and its composites have been widely explored as sorbents in different solid-phase extraction modalities. Nevertheless, graphene-based sorbents are prone to (i) irreversible aggregation, making the packed-beds susceptible to clogging and (ii) very good dispersion, which hinders the sorbent recovery in dispersive procedures. Hence, magnetic solid-phase extraction (MSPE) has become a promising strategy to overcome these limitations. The development and use of G and graphene-oxide (GO)-based magnetic composites have become current hot topics in sample preparation techniques, and a wide diversity of graphene-based magnetic sorbents has been prepared, demonstrating applicability to the uptake of diverse organic compounds from environmental, clinical, forensic, and food samples. This chapter will provide a comprehensive overview of the different reported graphene-based magnetic sorbents, their properties, preparation methods, the most critical techniques used for their characterization, and their unique applications. The most relevant literature, current challenges, and future developments also will be discussed.

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04 Aug 2021
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