Khalil Khaled D, Ahmed Hoda A, Bashal Ali H, Bräse Stefan, Nayl AbdElAziz A, Gomha Sobhi M
Department of Chemistry, Faculty of Science, Cairo University, Giza 12613, Egypt.
Department of Chemistry, Faculty of Science, Taibah University, Al-Madinah Almunawarah, Yanbu 46423, Saudi Arabia.
Polymers (Basel). 2022 Aug 17;14(16):3347. doi: 10.3390/polym14163347.
Calcium oxide (CaO) nanoparticles have recently gained much interest in recent research due to their remarkable catalytic activity in various chemical transformations. In this article, a chitosan calcium oxide nanocomposite was created by the solution casting method under microwave irradiation. The microwave power and heating time were adjusted to 400 watts for 3 min. As it suppresses particle aggregation, the chitosan (CS) biopolymer acted as a metal oxide stabilizer. In this study, we aimed to synthesize, characterize, and investigate the catalytic potency of chitosan-calcium oxide hybrid nanocomposites in several organic transformations. The produced CS-CaO nanocomposite was analyzed by applying different analytical techniques, including Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and field-emission scanning electron microscopy (FESEM). In addition, the calcium content of the nanocomposite film was measured using energy-dispersive X-ray spectroscopy (EDS). Fortunately, the CS-CaO nanocomposite (15 wt%) was demonstrated to be a good heterogeneous base promoter for high-yield thiazole production. Various reaction factors were studied to maximize the conditions of the catalytic technique. High reaction yields, fast reaction times, and mild reaction conditions are all advantages of the used protocol, as is the reusability of the catalyst; it was reused multiple times without a significant loss of potency.
氧化钙（CaO）纳米颗粒因其在各种化学转化中具有显著的催化活性，最近在研究中备受关注。在本文中，通过微波辐射下的溶液浇铸法制备了壳聚糖氧化钙纳米复合材料。将微波功率和加热时间调整为400瓦，持续3分钟。壳聚糖（CS）生物聚合物作为金属氧化物稳定剂，抑制了颗粒聚集。在本研究中，我们旨在合成、表征并研究壳聚糖 - 氧化钙杂化纳米复合材料在几种有机转化中的催化效能。通过应用不同的分析技术，包括傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）和场发射扫描电子显微镜（FESEM），对制备的CS - CaO纳米复合材料进行了分析。此外，使用能量色散X射线光谱（EDS）测量了纳米复合膜中的钙含量。幸运的是，CS - CaO纳米复合材料（15 wt%）被证明是高产噻唑生产的良好非均相碱促进剂。研究了各种反应因素以优化催化技术的条件。高反应产率、快速反应时间和温和的反应条件都是所用方案的优点，催化剂的可重复使用性也是如此；它可以多次重复使用而不会显著损失效能。
