Magnetic chitosan-copper nanocomposite: A plant assembled catalyst for the synthesis of amino- and N-sulfonyl tetrazoles in eco-friendly media
作者:Narjes Motahharifar、Mahmoud Nasrollahzadeh、Asghar Taheri-Kafrani、Rajender S. Varma、Mohammadreza Shokouhimehr
DOI:10.1016/j.carbpol.2019.115819
日期:2020.3
A greener, cost efficient and simple method is described to prepare copper nanoparticles (NPs) immobilized on the magnetic chitosan (one of the more versatile polysaccharides) using Euphorbia falcata leaf extract as reducing/stabilizing agent. The prepared catalyst (Cu NPs@Fe3O4-chitosan) was authenticated by field emission scanning electron microscope (FESEM), X-ray diffraction (XRD), transmission
描述了一种绿色环保,经济高效且简单的方法,该方法使用大戟叶提取物作为还原剂/稳定剂,制备了固定在磁性壳聚糖(功能更广泛的多糖之一)上的铜纳米颗粒(NPs)。通过场发射扫描电子显微镜(FESEM),X射线衍射(XRD),透射电子显微镜(TEM),扫描透射电子显微镜(STEM),能量色散X对所制备的催化剂(Cu NPs @ Fe3O4-壳聚糖)进行鉴定射线光谱(EDS),热重/衍生热重(TG / DTG),振动样品磁力计(VSM)和元素映射。TEM分析表明,在球形壳磁性壳聚糖上形成了平均粒径在5-10 nm范围内的Cu NPs。Cu NPs @ Fe3O4-壳聚糖被用作新的催化剂,通过各种仲或叔氰胺与叠氮化钠在水中在回流条件下反应,合成不同的四唑。该催化剂的一些有益特征是易于通过外部磁场分离,适度的反应条件,低成本和可重复使用性。