In situ self-assembly of three-dimensional porous graphene film on zinc fiber for solid-phase microextraction of polychlorinated biphenyls.

Abstract

Three-dimensional porous graphene film (3DPGF) wasfabricated on Zn fiber for solid-phase microextraction(SPME) through in-situ self-assembly strategy at roomtemperature. Fast electron transfer due to ionization of zincinduces reduction of graphene oxide and thus leads to thelayer-by-layer interfacial deposition of graphene sheets,forming three-dimensional porous network morphology.The 3D interpenetrating porous structure could provide moreavailable adsorption site for the target molecules and alsoenhance mass transfer efficiency in the extraction process.Therefore, the obtained 3DPGF fiber exhibited excellent performancewhen applied in the SPME of preconcentrationand quantification of polychlorinated biphenyls (PCBs) inenvironment waters. The developed method showed a linearrange from 1.0 ng L-1 and 200 ng L-1 with an acceptablecorrelation (R2=0.990). The limit of detection (LOD) andlimit of quantification (LOQ) were found 0.03-0.2 ng L-1and 0.1-0.8 ng L-1, respectively. The proposed method wasapplied in real water samples analysis with the recoveriesranging from 63.1 to 111.3%. The present study expandedthe application of three-dimensional porous graphene materialsin sample preparation and revealed its potential inSPME application.