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首页> 外文期刊>RSC Advances >Magnetic and electric field assisted electrospun polyamide nanofibers for on-line mu-solid phase extraction and HPLC
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Magnetic and electric field assisted electrospun polyamide nanofibers for on-line mu-solid phase extraction and HPLC

机译：磁场和电场辅助电纺聚酰胺纳米纤维的在线多固相萃取和HPLC

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The effects of applied magnetic and electric fields on electrospinning were investigated to produce more efficient nanofibers. Considering the previous extensive studies, polyamide nanofibers were prepared by a conventional approach and under auxiliary electric and magnetic fields. The first sorbent was synthesized by electrospinning of a solution of 18% polyamide in formic acid. The second and third types of polyamide were prepared similarly while the electrospinning processes were assisted by an electric and a magnetic field. The third type of polyamide contained a magnetic ionic liquid (MIL) to induce sufficient magnetic susceptibility in the polymeric solution. The SEM images revealed that the application of auxiliary electric and magnetic fields led to the aligned nanofibers with mean diameters of 200 and 90 nm, respectively while for the conventional electrospun non-woven nanofibers the mean diameter was 500 nm. To evaluate the extraction efficiency of the prepared nanofibers, they were removed from the collector electrode and packed into the mu-solid phase extraction (mu-SPE) cartridge, coupled on-line with high performance liquid chromatography (HPLC). Apart from the influence of the assisted fields on electrospinning, the effects of size of the nanofibers and the ionic liquid content on the mu-SPE of imidacloprid, metribuzin, ametryn and chlorpyrifos were investigated. The highest extraction efficiency was achieved for the third sorbent due to its higher aspect ratio. After preparation of five sets of nanofibers, it was revealed that the presence of MIL dopant up to 10% in a solution of 18% polyamide exhibited the most satisfactory results. The linearity for the analytes was in the range of 1-500 mu g L-1. The limit of detection (LOD) was in the range of 0.4-4 mu g L-1 and the RSD% values (n = 5) were all satisfactory at the 20 and 200 mu g L-1 levels. The applicability of the developed on-line mu-SPE-HPLC method was examined by analyzing real water samples obtained from spiked Zayandeh rood river and Caspian Sea and the relative recovery percentages were from 84 to 108% at 20 and 200 mu g L-1 levels.
机译：研究了施加的磁场和电场对静电纺丝的影响，以生产更有效的纳米纤维。考虑到先前的广泛研究，聚酰胺纳米纤维是通过常规方法并在辅助电场和磁场下制备的。通过静电纺丝18％聚酰胺在甲酸中的溶液来合成第一种吸附剂。类似地制备第二和第三类型的聚酰胺，同时在电场和磁场的辅助下进行电纺丝过程。第三类聚酰胺包含磁性离子液体（MIL），以在聚合物溶液中引起足够的磁化率。 SEM图像显示，施加辅助电场和磁场导致取向的纳米纤维分别具有200和90nm的平均直径，而对于常规的电纺非织造纳米纤维，其平均直径为500nm。为了评估制备的纳米纤维的萃取效率，将其从集电极上取下并包装到mu-固相萃取（mu-SPE）柱中，并与高效液相色谱（HPLC）在线耦合。除了辅助场对静电纺丝的影响外，还研究了纳米纤维的大小和离子液体含量对吡虫啉，美法津，ametricn和毒死rif的mu-SPE的影响。由于第三种吸附剂的高长径比，因此提取效率最高。在制备五组纳米纤维后，发现在18％聚酰胺溶液中存在高达10％的MIL掺杂剂表现出最令人满意的结果。分析物的线性在1-500μgL-1的范围内。检测限（LOD）在0.4-4μg L-1的范围内，并且RSD％值（n = 5）在20和200μgL-1水平下均令人满意。通过分析从加延扎耶德罗德河和里海获得的真实水样，检验了开发的在线mu-SPE-HPLC方法的适用性，在20和200μg L-1下相对回收率从84％到108％。水平。

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