Electrospun decyl-3-methylimidazolium mono bromate/polyamide nanofibers as solid-phase microextraction coating

•A decyl-3-methylimidazolium mono bromate/polyamide was synthesized by electrospinning technique.•The PA nanofibers at the presence of IL have thinner diameter and more porosity.•The synthesized sorbent was applied for suitable isolation of chlorobenzenes form various samples.

In the current study, electrospun-based ionic liquid (IL) doped polyamide (PA) nanofibers were prepared and used as the coating material of solid phase microextration device in the fiber geometry. Addition of IL, decyl-3-methylimidazolium mono bromate, increased the conductivity of the PA solution facilitating the electrospining process. The scanning electron microscopy images of decyl-3-methylimidazolium mono bromated/polyamide nanofibers showed the decreased diameter of the nanofibers in the range of 35-160 nm compared to the PA nanofiber. The factors affecting the structure of nanofibers (e.g. ratio of decyl-3-methylimidazolium mono bromate to PA, coating time and applied voltage) were studied. In addition, influential parameters of extraction/desorption performance such as ionic strength, extraction time, and desorption time and temperature were studied. The limit of detections and limit of quantifications were obtained in the range of 0.75-0.9 and 2-5 ng L−1, respectively, demonstrating high efficiency of the prepared nanofiber. The developed method also showed good repeatability, RSD 4-9% (n = 3), for the spiked aqueous solution at concentration level 150 ng L−1 of chlorobenzenes, and linearity,R = 0.996, in the range of 5-5000 ng L−1.