Department of Chemistry, University Campus 2, University of Guilan, Rasht, 4199613776, Iran.
Department of Chemistry, School of Science, Alzahra University, PO Box 1993891176, Vanak, Tehran, Iran.
Sci Rep. 2020 Sep 17;10(1):15285. doi: 10.1038/s41598-020-71866-2.
In this work, with the use of two natural compounds, chitin and sepiolite clay, a novel covalent hybrid is fabricated and applied as a support for the stabilization of silver nanoparticles with the aid of Kombucha extract as a natural reducing agent. The resultant catalytic system, Ag@Sep-N-CH, was characterized via XRD, TEM, FTIR, ICP, SEM, TGA, UV-Vis and BET. It was found that fine Ag(0) nanoparticles with mean diameter of 6.1 ± 1.8 nm were formed on the support and the specific surface area of the catalyst was 130 m g. The study of the catalytic performance of Ag@Sep-N-CH for catalyzing synthesis of xanthenes in aqueous media under mild reaction condition confirmed that Ag@Sep-N-CH exhibited high catalytic activity and could promote the reaction of various substrates to furnish the corresponding products in high yields. Moreover, the contribution of both chitin and sepiolite to the catalysis has been affirmed. It was found that hybridization of these two components led to synergistic effects and consequently improved the observed catalytic activity. Notably, the catalyst was recyclable up to several reaction runs.
在这项工作中，我们使用两种天然化合物——甲壳素和海泡石粘土，制备了一种新型的共价杂化材料，并将其作为载体，在康普茶提取物作为天然还原剂的帮助下，稳定银纳米粒子。所得的催化体系 Ag@Sep-N-CH 通过 XRD、TEM、FTIR、ICP、SEM、TGA、UV-Vis 和 BET 进行了表征。结果发现，在载体上形成了平均直径为 6.1±1.8nm 的细小 Ag(0)纳米粒子，催化剂的比表面积为 130m²/g。Ag@Sep-N-CH 在温和反应条件下催化水溶液中呫吨酮的合成反应的催化性能研究表明，Ag@Sep-N-CH 表现出高催化活性，能够促进各种底物的反应，以高产率得到相应的产物。此外，还证实了甲壳素和海泡石对催化反应的贡献。结果发现，这两种成分的杂交产生了协同效应，从而提高了观察到的催化活性。值得注意的是，该催化剂在多次反应循环中可回收利用。
