Cellulose ( IF 4.9 ) Pub Date : 2021-08-03 , DOI: 10.1007/s10570-021-04113-0 Song Zhang 1, 2 , Tingting Zhang 1, 2 , Jinxin He 1, 2 , Xia Dong 2, 3
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Silver nanoparticles (AgNPs) loaded on the cotton fiber can endow the fiber with good antibacterial activity, but the AgNPs on the surface of cotton fiber will leach out with the increase of washing times, which will not only greatly reduce the antibacterial properties of cotton fiber, but also cause pollution to the environment. In this paper, carboxyl groups were introduced into cotton fiber by three methods, namely selective oxidation, butane tetracarboxylic acid (BTCA) grafting and polyacrylic acid (PAA) adsorption. The silver ions (Ag+) were adsorbed on the cotton fibers through electrostatic attraction, and after reduction, the AgNPs were loaded onto the cotton fibers, and the AgNP distribution on the fiber and its effect to the washing resistance of AgNPs were studied. The results showed that the carboxyl groups can be introduced onto the cotton fibers by all the three methods, and the reaction only occurred in the amorphous region of the fibers. The selective oxidation and the BTCA grafting can introduce carboxylic groups into the interior of cotton fibers while the PAA adsorption only imports carboxyl groups on the surface of the fiber. As a consequence, AgNPs were formed inside of the cotton fiber when the selective oxidation and the BTCA grafting were employed, while AgNPs can only be loaded on the surface of the fiber by the PAA adsorption method. AgNPs inside of the fiber have high energetic adherence, resulting in silver-cotton fabric nanocomposites with strong slow-release property and long-term antibacterial ability. The fabric nanocomposites prepared by selective oxidation and BTCA grafting exhibited high AgNP retention rate and excellent antibacterial activity even after 80 washing cycles.
Graphic abstract
中文翻译：
AgNP在棉纤维上的分布对抗菌棉织物耐久性的影响
负载在棉纤维上的纳米银（AgNPs）可以赋予纤维良好的抗菌活性，但随着洗涤次数的增加，棉纤维表面的AgNPs会渗出，不仅会大大降低棉纤维的抗菌性能，还会对环境造成污染。本文通过选择性氧化、丁烷四羧酸(BTCA)接枝和聚丙烯酸(PAA)吸附三种方法将羧基引入棉纤维中。银离子（Ag +)通过静电引力吸附在棉纤维上，还原后将AgNPs负载在棉纤维上，研究了AgNPs在纤维上的分布及其对AgNPs耐洗性的影响。结果表明，三种方法均能在棉纤维上引入羧基，反应只发生在纤维的非晶区。选择性氧化和BTCA接枝可以将羧基引入棉纤维内部，而PAA吸附仅引入纤维表面的羧基。因此，当采用选择性氧化和 BTCA 接枝时，在棉纤维内部形成了 AgNPs，而 AgNPs 只能通过 PAA 吸附方法负载在纤维表面。纤维内部的AgNPs具有高能量粘附性，导致银棉织物纳米复合材料具有很强的缓释性能和长期抗菌能力。通过选择性氧化和 BTCA 接枝制备的织物纳米复合材料即使在 80 次洗涤循环后仍表现出较高的 AgNP 保留率和优异的抗菌活性。
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