Synthesis of Chitosan-La2O3 Nanocomposite and Its Utility as a Powerful Catalyst in the Synthesis of Pyridines and Pyrazoles
作者:Khaled D. Khalil、Sayed M. Riyadh、Mariusz Jaremko、Thoraya A. Farghaly、Mohamed Hagar
DOI:10.3390/molecules26123689
日期:——
peaks of chitosan, which were modified by interaction with La2O3 nanoparticles. Additionally, SEM graphs showed dramatic morphological changes on the surface of chitosan, which is attributed to surface adsorption with La2O3 molecules. The prepared CS/La2O3 nanocomposite film (15% by weight) was investigated as an effective, recyclable, and heterogeneous base catalyst in the synthesis of pyridines and pyrazoles
近年来,基于天然多糖的纳米催化剂的开发受到了广泛关注。壳聚糖(CS)作为一种可生物降解且具有生物相容性的多糖,被认为是设计基于混合生物聚合物的金属氧化物纳米复合材料的绝佳模板。在这种情况下,通过简单的溶液浇铸方法制备了不同重量百分比(5、10、15和20wt%CS/La 2 O 3 )掺杂壳聚糖的氧化镧纳米颗粒。将制备的CS/La 2 O 3纳米复合材料溶液浇注在培养皿中以生产所开发的催化剂,其形状为薄膜。通过 FTIR、SEM 和 XRD 分析工具研究了杂化纳米复合材料薄膜的结构特征。 FTIR 光谱证实了壳聚糖的主要特征峰的存在,该峰通过与La 2 O 3纳米粒子的相互作用而被修饰。此外,SEM图显示壳聚糖表面发生显着的形态变化,这归因于La 2 O 3分子的表面吸附。所制备的CS/La 2 O 3纳米复合薄膜(15%重量)被研究为吡啶和吡唑合成中有效的、可回收的、非均相的碱催化剂。所