National Research Centre (Scopus Affiliation ID 60014618), Textile Research Division, Pre-Treatment and Finishing of Cellulosic Fibres Department, 33g-El-Behouth St. (former El-Tahrir str.), Dokki, P.O. 12622, Giza, Egypt.
National Research Centre (Scopus Affiliation ID 60014618), Textile Research Division, Pre-Treatment and Finishing of Cellulosic Fibres Department, 33g-El-Behouth St. (former El-Tahrir str.), Dokki, P.O. 12622, Giza, Egypt.
Carbohydr Polym. 2017 Dec 15;178:251-259. doi: 10.1016/j.carbpol.2017.09.024. Epub 2017 Sep 9.
The research work presented herein was undertaken with a view to develop, characterize and highlight modified cotton fabrics that acquire durable antibacterial activity in concomitant with high metal sorption capacity. The development is based on reacting cotton cellulose previously oxidized by sodium periodate-with 4 amino-1,2,4 triazole in presence and absence of silver nano particles (AgNPs). The idea behind the periodate pretreatment is to convert (via oxidative cleavge) the 2,3-vicinal diol of the anhydroglucose units of cotton into aldehyde groups. The latter are easily reacting with the triazole groups in the modified cotton. On the other hand AgNPs were fabricated as per the reduction method using bio-material extracted from the root of licorice. By virtue of its reducing action, the bio-material converts Ag ions to Ag atom which is also stabilized Ag the bio-material in the form of cluster which is the agregate of about 5 Ag. The clusters are cropped with the stabilizer thus forming silver nanoparticles. Measurement of the particle size displays a value of 8.7nm. Charactrisation of triazole treated cotton fabrics reveals the presence of the triazole moieties inside the structure of cotton. Furthermore, Fabrictreated with triazole in presence and absence of AgNPs exhibits a relatively high antibacterial activity against gram-negative tested bacteria (E. coli) as compared to that of gram-positive tested bacteria (S. aureus). The metal sorption of triazole treated cotton fabrics was higher than those of untreated or periodate pretreated fabric due to the increase in nitrogen centers created along the cellulose chains. Experimental data were accomplished through Langmuir, Freundlich and Temkin sorption isotherm models. It was shown that sorption follows Langmuir isotherm model and suggests that the innovative fabric in question can adsorb metal ions from polluted dye bath.
本文的研究工作旨在开发、表征和突出改性棉织物，使其在获得持久抗菌活性的同时具有高金属吸附能力。该开发基于在存在和不存在银纳米粒子 (AgNPs) 的情况下，用 4-氨基-1,2,4-三唑与之前被高碘酸钠氧化的棉纤维素反应。过碘酸盐预处理的想法是通过（通过氧化裂解）将棉中脱水葡萄糖单元的 2,3-顺式二醇转化为醛基。后者很容易与改性棉中的三唑基反应。另一方面，AgNPs 是按照使用从甘草根提取的生物材料的还原方法制造的。由于其还原作用，生物材料将 Ag 离子转化为 Ag 原子，Ag 原子也以 Ag 簇的形式稳定在生物材料中，Ag 簇约为 5Ag 的聚集。簇与稳定剂一起裁剪，从而形成银纳米颗粒。粒径的测量显示值为 8.7nm。三唑处理的棉织物的特性表明三唑基团存在于棉的结构内部。此外，与未经处理或过碘酸盐预处理的织物相比，用三唑处理并存在和不存在 AgNPs 的织物对革兰氏阴性测试细菌（大肠杆菌）表现出相对较高的抗菌活性。由于纤维素链上增加了氮中心，因此三唑处理的棉织物的金属吸附能力高于未处理或过碘酸盐预处理的织物。实验数据通过 Langmuir、Freundlich 和 Temkin 吸附等温线模型完成。结果表明，吸附遵循 Langmuir 等温线模型，表明所讨论的创新织物可以从污染的染浴中吸附金属离子。
