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 m² g⁻¹. 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，使用甲壳素和海泡石粘土这两种天然化合物，制造了一种新型共价杂化物，并借助康普茶提取物作为天然还原剂，将其用作稳定银纳米颗粒的载体。通过 XRD、TEM、FTIR、ICP、SEM、TGA、UV-Vis 和 BET 对所得催化体系 Ag@Sep-N-CH 进行了表征。结果发现，载体上形成了平均直径为6.1±1.8 nm的细小Ag(0)纳米粒子，催化剂的比表面积为130 m ² g ^-1 。对Ag@Sep-N-CH在温和反应条件下在水介质中催化合成呫吨的催化性能研究表明，Ag@Sep-N-CH表现出较高的催化活性，可以促进多种底物的反应，从而提供相应产品产量高。此外，甲壳素和海泡石对催化的贡献也得到了肯定。研究发现，这两种组分的杂交会产生协同效应，从而提高了观察到的催化活性。值得注意的是，该催化剂可回收多次反应。