AbstractThe authors describe the synthesis of spider-web-like chitosan/MIL-68(Al) composite nanofibers, their application to fast solid phase extraction (SPE) of trace levels of Pb(II) and Cd(II), and their quantitation by ICP-OES. The composite nanofibers were characterized by X-ray diffraction, scanning electron microscopy, N2 adsorption-desorption experiments and FT-IR. The pH value of sample solutions, amount of sorbent, eluent concentration and type and volume of the eluting solvent were optimized using factorial experimental design. Under the optimum conditions, the detection limits are 0.16 μg L−1, and linear ranges extend from 0.5–50 μg L−1 for both Pb(II) and Cd(II). The intra-day relative standard deviations (RSDs) of <3.8% and inter-day RSDs of <4.3% are quite acceptable. The accuracy of the method was tested by the analysis of the certified reference material IAEA-407 and by recovery measurements on spiked real samples (phylum, gastropoda, Trochus erythraeus mollusks) which demonstrated the good performance of the method for SPE and determination of Pb(II) and Cd(II) ions. Graphical abstractA novel spider-web-like chitosan/MIL-68(Al) composite nanofibers were synthesized via electrospining and applied for efficient solid phase extraction of the trace levels of Pb(II) and Cd(II) from a mollusk phylum, gastropoda, Trochus erythraeus following its combination by inductively coupled plasma optical emission spectrometry.

中文翻译：

---

蜘蛛网状壳聚糖/MIL-68(Al)复合纳米纤维用于高效固相萃取Pb(II)和Cd(II)

摘要作者描述了蜘蛛网状壳聚糖/MIL-68(Al) 复合纳米纤维的合成，它们在快速固相萃取 (SPE) 痕量 Pb(II) 和 Cd(II) 中的应用，以及它们的定量ICP-OES。通过X射线衍射、扫描电子显微镜、N2吸附-解吸实验和FT-IR对复合纳米纤维进行了表征。采用析因实验设计优化了样品溶液的pH值、吸附剂用量、洗脱液浓度以及洗脱溶剂的类型和体积。在最佳条件下，Pb(II) 和 Cd(II) 的检测限为 0.16 μg L-1，线性范围为 0.5-50 μg L-1。<3.8% 的日内相对标准偏差 (RSD) 和 <4.3% 的日间相对标准偏差 (RSD) 是完全可以接受的。该方法的准确性通过对有证参考物质 IAEA-407 的分析和对加标实际样品（门、腹足类、红梭菌）的回收率测量进行测试，证明了该方法在 SPE 和 Pb( II) 和 Cd(II) 离子。图形摘要通过静电纺丝法合成了一种新型蜘蛛网状壳聚糖/MIL-68(Al) 复合纳米纤维，并将其应用于软体动物门、腹足类动物门中痕量 Pb(II) 和 Cd(II) 的有效固相提取， Trochus erythraeus 通过电感耦合等离子体发射光谱法进行组合。Trochus erythraeus mollusks) 证明了该方法在 SPE 和测定 Pb(II) 和 Cd(II) 离子方面的良好性能。图形摘要通过静电纺丝法合成了一种新型蜘蛛网状壳聚糖/MIL-68(Al) 复合纳米纤维，并将其应用于软体动物门、腹足类动物门中痕量 Pb(II) 和 Cd(II) 的有效固相提取， Trochus erythraeus 通过电感耦合等离子体发射光谱法进行组合。Trochus erythraeus mollusks) 证明了该方法在 SPE 和测定 Pb(II) 和 Cd(II) 离子方面的良好性能。图形摘要通过静电纺丝法合成了一种新型蜘蛛网状壳聚糖/MIL-68(Al) 复合纳米纤维，并将其应用于软体动物门、腹足类动物门中痕量 Pb(II) 和 Cd(II) 的有效固相提取， Trochus erythraeus 通过电感耦合等离子体发射光谱法进行组合。