戊二醛改性交联壳聚糖纳米纤维膜负载钯催化剂的制备及其催化性能研究

发布时间：2019-04-17 15:06

【摘要】：以壳聚糖(CS)为基体聚合物、聚甲基丙烯酸(PMAA)为共纺聚合物,通过静电纺丝和热交联技术制备了具有良好形貌和稳定性的交联壳聚糖/聚甲基丙烯酸(CS/PMAA)纳米纤维膜,然后采用戊二醛对纤维进行化学改性后用于负载钯催化剂.采用扫描电镜(SEM)表征纤维膜的微观结构;通过扫描电子显微镜-能谱仪(SEM-EDS)和X-射线衍射仪(XRD)分析钯催化中心在纤维膜上的分布;采用红外光谱(FT-IR)表征戊二醛改性后纤维膜的化学结构变化;利用密度泛函理论(DFT)研究戊二醛改性对壳聚糖纤维膜与钯催化中心之间络合强度的影响.Sonogashira偶联反应催化结果显示,戊二醛改性有助于提高纤维膜负载钯催化剂的催化活性,且该催化剂在重复使用9次后,催化反应转化率和产率基本保持不变.
[Abstract]:Chitosan (CS) was used as matrix polymer and poly (methacrylic acid) (PMAA) was used as co-spinning polymer. Cross-linked chitosan / poly (methacrylic acid) (CS/PMAA) nanofiber membranes with good morphology and stability were prepared by electrospinning and thermal cross-linking. Then the fibers were chemically modified by glutaraldehyde and used as palladium catalysts. The microstructure of the fiber membrane was characterized by scanning electron microscopy (SEM), and the distribution of palladium catalytic center on the fiber membrane was analyzed by scanning electron microscope-energy dispersive spectroscopy (SEM-EDS) and X-ray diffractometer (XRD). The chemical structure of glutaraldehyde modified fiber membrane was characterized by infrared spectroscopy (FT-IR). The effect of glutaraldehyde modification on the complexation strength between chitosan fiber membrane and palladium catalytic center was studied by density functional theory (DFT). The modification of glutaraldehyde can improve the catalytic activity of the fiber membrane supported palladium catalyst, and the conversion and yield of the catalyst remain basically unchanged after 9 times of reuse.
【作者单位】：宁波大学材料科学与化学工程学院;绍兴文理学院浙江省精细化学品传统工艺替代技术研究重点实验室;
【基金】：国家自然科学基金资助项目(11575117) 浙江省自然科学基金资助项目(LQ14E030003)
【分类号】：O643.36

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