Materials Polymer Laboratory, Macromolecular Chemistry Department, Faculty of Chemistry, University of Sciences and Technology Houari Boumediene USTHB, B.P. 32 El-Alia, 16111 Algiers, Algeria; Centre de Recherche Scientifique et Technique en Analyses Physico-chimiques (CRAPC), Zone Industrielle, BP 384, Bou-Ismail, Tipaza, Algeria; Unité de Recherche en Analyses Physico-Chimiques des Milieux Fluides et Sols-(URAPC-MFS/CRAPC), 11, Chemin Doudou Mokhtar, Ben Aknoun, Alger, Algeria.
Materials Polymer Laboratory, Macromolecular Chemistry Department, Faculty of Chemistry, University of Sciences and Technology Houari Boumediene USTHB, B.P. 32 El-Alia, 16111 Algiers, Algeria.
Int J Biol Macromol. 2024 Nov;279(Pt 4):135556. doi: 10.1016/j.ijbiomac.2024.135556. Epub 2024 Sep 11.
Herein, bionanocomposite beads based on Carboxymethyl cellulose/Dextrant sulfate (CMC/DS) embedding silver nanoparticle-functionalized zeolite (AgZ) were developed and proposed as catalysts for catalytic hydrogenation of Direct Red 16 (DR16) azo dye under different experimental parameters. The obtained results showed that AgZ incorporation into the polymer matrix produced highly porous structures with improved thermal stability. For antibacterial application, it was shown that the engineered bionanocomposites were effective against all tested bacteria. The CMC-DS-AgZ catalysts showed good catalytic performances for the hydrogenation of DR16 in various real-life water samples and even in presence of several mineral salts, however with a high efficiency (99 %) obtained for the catalyst prepared at elevated AgZ content (with a k rate constant of 0.239 min). Moreover, the hydrogenation study of various azo dyes highlighted the satisfactory application potential of the catalysts and their versatility. The catalyst beads showed good recyclability for five successive cycles without any significant loss of efficiency or stability. The proposed mechanism for DR16 catalytic hydrogenation on C3-D1-AgZ revealed that AgZ could enhance the catalytic activity of the beads by facilitating the formation of AgH intermediates. Finally, the green synthesized materials were shown to be viable and potential candidates for the purification of environmental media.
本文制备了载银纳米沸石（AgZ）的羧甲基纤维素/葡聚糖硫酸盐（CMC/DS）复合纳米微球，并将其作为催化剂用于直接红 16（DR16）偶氮染料在不同实验参数下的催化加氢反应。结果表明，AgZ 的加入改善了聚合物基体的热稳定性，并形成了具有高比表面积的多孔结构。在抗菌应用方面，所制备的纳米复合材料对所有测试的细菌均具有良好的抗菌活性。在各种实际水样中，甚至在存在多种无机盐的情况下，所制备的 CMC-DS-AgZ 催化剂均对 DR16 的加氢反应表现出良好的催化性能，而当 AgZ 含量较高时（k 速率常数为 0.239 min），催化剂的催化效率可达 99%。此外，对各种偶氮染料的加氢研究表明，所制备的催化剂具有良好的应用潜力和通用性。催化剂微球在连续五次循环使用后仍具有良好的稳定性和催化活性，没有明显的失活现象。DR16 在 C3-D1-AgZ 上的催化加氢反应的机理表明，AgZ 可以通过促进 AgH 中间体的形成来提高催化剂的催化活性。最后，所制备的绿色合成材料有望成为环境介质净化的可行候选材料。
