چكيده فارسي :
This work represents a new gradient fiber consisting a coating of nanoclusters organoclay–Cu on a copper wire by wireless electrofunctionalization. The current approach is a new method for preparation of gradient coating with more robustness, thermal and mechanical stability. The wireless electrofunctionalization process was carried out in a bipolar cell under a constant deposition potential and applied to the corresponding ethanolic electrolyte containing stearic acid and montmorillonite [1,2]. The stearic acid was chosen as an inexpensive and green coating and montmorillonite was selected as modifier to improve the fiber thermal stability [3-5]. The coated wire was placed in a needle and used as sorbent for headspace in–tube microextraction of chlorobenzene. The gradient nanoclusters of organoclay–Cu coating were approved by scanning electron microscopy, thermogravimetric analysis and energy dispersive X-ray spectroscopy. Effects of different parameters influencing the synthesizing condition and the extraction processes were investigated and optimized. The limits of detection and quantification of the method under optimized conditions were 0.5–10 and 2–35 ng L-1, respectively. The intra–day and inter–day relative standard deviation at 1 ng L-1 concentration level (n=3) using a single fiber were 6–11 and 9–15, respectively. The fiber to fiber RSD% (n=3) was between 17 and 24. The proposed method was successfully applied to the extraction of CBs from real water samples and relative recoveries were between 91 and 110%.
