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Abstract
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A novel method for simple, fast and reproducible preparation of a reinforced polyamide (PA)-based stir bar was presented. The carbon nanotube/polyamide stir bar was prepared by dispersion of an appropriate amount of oxidized multiwalled carbon nanotubes (MWCNTs) in a solution of PA in formic acid (FA) followed by dipping the stainless steel substrate of stir bar into the prepared solution. Finally, dipping the CNT/PA coated substrate into water causes the diffusion of formic acid into water and remaining CNT/ PA forms a homogenous layer on the stainless steel substrate. The surface characteristics of PA and CNT/PA coated stir bars were investigated using scanning electron microscopy (SEM). The prepared CNT/PA nanocomposite-based stir bar was used as an extraction device for stir bar sorptive extraction 1-3 (SBSE) of naproxen (NAP) from biological samples followed by fluorimetric detection. The effect of CNT doping level on the extraction capability of the prepared coating was investigated. Important parameters influencing the extraction and desorption processes including extraction time, salt content, pH, desorption solvent, its volume and desorption time were optimized using response surface methodology (RSM).
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