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Graphene aerogel–mesoporous carbon (GA–MC) composites with three-dimensional (3D) hierarchical nanostructures were synthesized using a nanocasting technique. The honeycomb-like GA–MC composites exhibited very high surface areas (728.3 m2 g−1), and ultra large pore sizes (48 nm) and pore volumes (0.96 cm3 g−1) due to the synergistic combination of the advantages of both macro-porous graphene aerogels and the meso-pores of mesoporous carbon. These wonderful features made GA–MC a promising enrichment material for SPME fiber coating. Under the optimum conditions, the home-made fiber (GA–MC) was successfully applied to extract BFRs in real wastewater samples and ideal results were obtained with recoveries of 74.6–96.2%. The new fibers demonstrated excellent enrichment capabilities compared to commercial polydimethylsiloxane (PDMS) and polyacrylate (PA) fibers for six brominated flame retardants (BFRs). The ideal extraction performance of the novel graphene aerogel–mesoporous composites creates new opportunities for SPME applied in environmental analysis. [ABSTRACT FROM AUTHOR]

By employing dopamine as a nitrogen source and reducing agent, the block copolymer P123 as a pore forming agent, and graphene oxide as a carbon precursor, we present, for the first time, a convenient and controllable approach to the preparation of a novel uniformly nitrogen doped porous graphene (N-PGR) material. Using the prepared N-PGR as the supporting material, a novel nitrogen doped porous graphene/Pt nanoflower material (Pt/N-PGR) was obtained by a green and simple method. The characterization results of scanning electron microscopy (SEM), element mapping, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) demonstrate that Pt nanoflowers are uniformly dispersed on nitrogen doped porous graphene. Electrochemical measurements show that Pt/N-PGR-900/GCE exhibits improved electrocatalytic activity towards H2O2 reduction and glucose oxidation. Linear responses are found for H2O2 and glucose in the range of 0.5–40 326 μM and 0.5–133.5 mM with the detection limit (S/N = 3) of 0.2 μM and 0.05 mM, respectively. In addition, Pt/N-PGR-900/GCE exhibits high sensitivity and good anti-interference ability. The superior catalytic activity and selectivity make Pt/N-PGR a promising nanomaterial for application in electrochemical biosensing studies. [ABSTRACT FROM AUTHOR]