Abstract β-cyclodextrin (β-CD) based materials have been studied widely as adsorbents and filter membranes for removing pollutants in air or water applications. The present study aimed to develop a sandwich structure of eletrospun nanofibrous membrane based on β-cyclodextrin and PA66 to achieve the high mechanical strength and flow-through adsorption of heavy metal ions in water. The surface and cross section morphology of PA66/β-cyclodextrin/PA66 nanofibrous membranes (PA66/β-CD/PA66 NMs) were examined using scanning electron microscopy (SEM). The physicochemical and mechanical properties of PA66/β-CD/PA66 NMs were analyzed by differential scanning calorimetry (DSC), thermogravimetric (TG) analysis and universal testing machine. The diameter of β-CD and PA66 electrospun fibers are 300–400 nm and 20–40 nm respectively. PA66/β-CD/PA66 NMs show a loosely arranged fibers and layer by layer structure. The tensile strength increases remarkably for PA66/β-CD/PA66 NMs, from 1.33 MPa of β-CD NMs to 23.17 MPa and the Young's modulus increases from 34.8 MPa to 253.3 MPa. The mechanical behavior of PA66/β-CD/PA66 NMs is a typical brittle fracture, and its microcosmic fracture diagrams are also involved. TGA/DSC results confirm the thermal crosslinking reaction is effective and complete. On the basis of SEM, DSC, TG and mechanical behavior analysis results, the molecular mechanism of in situ thermal crosslinking reaction is discussed. Fe3+、Ni2+ were used to confirm the ability to absorb heavy metal ions of PA66/β-CD/PA66 NMs. In conclusion, PA66/β-CD/PA66 NMs could be a promising solution for removal of metal ions by flow-through adsorption.

中文翻译：

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具有高机械强度的原位热交联 PA66/β-环糊精/PA66 纳米纤维膜通过流动吸附去除重金属离子

摘要 β-环糊精（β-CD）基材料作为吸附剂和过滤膜被广泛研究，用于去除空气或水应用中的污染物。本研究旨在开发一种基于 β-环糊精和 PA66 的电纺纳米纤维膜的夹心结构，以实现对水中重金属离子的高机械强度和流通吸附。使用扫描电子显微镜 (SEM) 检查 PA66/β-环糊精/PA66 纳米纤维膜 (PA66/β-CD/PA66 NMs) 的表面和横截面形态。通过差示扫描量热法（DSC）、热重法（TG）分析和万能试验机分析了PA66/β-CD/PA66 NMs的理化和机械性能。β-CD 和 PA66 电纺纤维的直径分别为 300-400 nm 和 20-40 nm。PA66/β-CD/PA66 NMs 显示出松散排列的纤维和逐层结构。PA66/β-CD/PA66 NMs 的拉伸强度显着增加，从 β-CD NMs 的 1.33 MPa 增加到 23.17 MPa，杨氏模量从 34.8 MPa 增加到 253.3 MPa。PA66/β-CD/PA66 NMs的力学行为是典型的脆性断裂，其微观断裂图也有参与。TGA/DSC 结果证实热交联反应有效且完全。在SEM、DSC、TG和力学行为分析结果的基础上，讨论了原位热交联反应的分子机制。Fe3+、Ni2+被用来确认PA66/β-CD/PA66 NMs对重金属离子的吸附能力。总之，PA66/β-CD/PA66 NMs 可能是通过流通吸附去除金属离子的有前途的解决方案。