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Three-dimensional nanofiber scaffolds are superior to two-dimensional mats in micro-oriented extraction of chlorobenzenes
Microchimica Acta ( IF 5.7 ) Pub Date : 2018-06-08 , DOI: 10.1007/s00604-018-2858-7
Habib Bagheri , Faranak Manshaei , Omid Rezvani

AbstractThree-dimensional (3D) polyamide scaffolds were fabricated by applying a solvent bath as the collecting element. Electrospun nanofibers were immersed into the solvent bath to give a material with a laminated 3D texture. In parallel, 2D nanofibers were synthesized and utilized as microextractive phases in a needle trap device to compare the capabilities of 2D and 3D materials in terms of headspace extraction of various chlorobenzenes (chlorobenzene, 1,2-dichlorobenzene, 1,4-dichlorobenzene, 1,2,4-trichlorobenzene and 1,2,3,4-tetrachlorobenzene). The results demonstrate the superiority of 3D nanofibrous scaffolds over 2D mats. The porosity, morphology, and thermal stability of the 3D scaffolds were characterized using FT-IR, scanning electron microscopy, confocal laser scanning microscopy and thermogravimetric analysis. The CLSM images were reconstructed and analyzed by Image J software, and eventually the enhancement of porosity using 3D scaffolds was confirmed. The type of solvent bath, polyamide solution concentration and other parameters were optimized. Following thermal desorption of the chlorobenzenes, they were quantified by GC-MS. Under optimum conditions, the calibration plots cover the 0.004–1.0 pg μL−1 concentration range and the limits of detection are in the range from 0.8–3 pg mL−1. The relative standard deviations (RSDs) are between 3 and 8% and 3–10% (n = 3) at spiking levels of 200 and 1000 ng L−1, respectively. The RSDs for the needle-to-needle repeatability are <15% (for n = 3). This needle trap microextraction method was applied to the analysis of river water, sea water, and of inlet water of a water treatment plant. Graphical abstractSchematic diagram symbolizing the extractive effectiveness of sponge-like 3D nanofibrous scaffolds with respect to smooth 2D electrospun nanofibers. Under the same experimental conditions, higher porosity of 3D scaffolds is amazingly contributed to the more accessible adsorptive sites which in turn makes them drastic and innovative candidate for micro–oriented extraction purposes.

中文翻译:

三维纳米纤维支架在微定向提取氯苯方面优于二维垫

摘要 通过应用溶剂浴作为收集元件制造了三维 (3D) 聚酰胺支架。将电纺纳米纤维浸入溶剂浴中,得到具有层压 3D 纹理的材料。同时,合成 2D 纳米纤维并用作针阱装置中的微萃取相,以比较 2D 和 3D 材料在顶空萃取各种氯苯(氯苯、1,2-二氯苯、1,4-二氯苯、1 ,2,4-三氯苯和 1,2,3,4-四氯苯)。结果证明了 3D 纳米纤维支架优于 2D 垫子。使用 FT-IR、扫描电子显微镜、共聚焦激光扫描显微镜和热重分析表征 3D 支架的孔隙率、形态和热稳定性。CLSM 图像由 Image J 软件重建和分析,最终确认使用 3D 支架增强孔隙率。优化了溶剂浴类型、聚酰胺溶液浓度等参数。氯苯热解吸后,通过 GC-MS 对其进行定量。在最佳条件下,校准图覆盖 0.004–1.0 pg μL-1 浓度范围,检测限在 0.8–3 pg mL-1 范围内。在 200 和 1000 ng L-1 的加标水平下,相对标准偏差 (RSD) 分别在 3% 和 8% 之间以及 3% 到 10% (n = 3) 之间。针对针重复性的 RSD <15%(对于 n = 3)。将该针阱微萃取方法应用于河水、海水和水处理厂进水的分析。图形摘要示意图,表示海绵状 3D 纳米纤维支架相对于光滑的 2D 电纺纳米纤维的提取效率。在相同的实验条件下,3D 支架的更高孔隙率令人惊讶地有助于更容易接近的吸附位点,这反过来又使它们成为用于微观提取目的的激进和创新的候选者。
更新日期:2018-06-08
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