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Direct Carboxymethylation of Cellulose Fibers by Ternary Reactive Deep Eutectic Solvents for the Preparation of High-Yield Cellulose Nanofibrils
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2024-04-01 , DOI: 10.1021/acssuschemeng.3c08071 Guangrui Ma 1 , Wenqi Yin 1 , Zhijun Shi 1 , Yan Xu 2 , Guang Yang 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2024-04-01 , DOI: 10.1021/acssuschemeng.3c08071 Guangrui Ma 1 , Wenqi Yin 1 , Zhijun Shi 1 , Yan Xu 2 , Guang Yang 1
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Carboxymethylation-modified cellulose nanofibrils (CMCNF) were prepared from bamboo fibers through a pretreatment process using a ternary deep eutectic solvent (DES) system consisting of chloroacetic acid, urea, and choline chloride. Grinding treatment was also employed. The properties of the resulting CMCNF were characterized using various analytical instruments including a fiber image analyzer, field-emission scanning electron microscope, X-ray diffractometer, and atomic force microscope. The results indicated that ternary DES pretreatment has the capability to carboxymethylate-modify the raw fiber material while maintaining the crystalline structure of cellulose. Additionally, it induced a wetting and swelling effect on the fibers, leading to the successful disruption of strong hydrogen bonds and the rapid production of cellulose nanofibrils during mechanical treatment. The carboxymethylation alteration enhanced the ability of the resultant CNF to disperse and increased the stability of the suspension. Furthermore, extending the duration of DES pretreatment enhances the process of fiber fibrillation and diminishes fiber polymerization. The CMCNF produced exhibited a high aspect ratio, with diameters ranging from 10 to 50 nm and lengths extending to a few micrometers. This study presents a novel approach and concept for producing carboxymethylated nanofibrillated cellulose. It also introduces a straightforward, environmentally friendly, and effective method for mass production of bamboo pulp nanofibrillated cellulose. This advancement is anticipated to enhance the processing and utilization of bamboo fiber resources, thereby contributing to an increased overall value.
中文翻译：
三元反应性低共熔溶剂直接羧甲基化纤维素纤维制备高产纤维素纳米纤丝
采用由氯乙酸、尿素和氯化胆碱组成的三元低共熔溶剂 (DES) 体系对竹纤维进行预处理，制备出羧甲基化改性纤维素纳米纤丝 (CMCNF)。还采用了研磨处理。使用各种分析仪器（包括光纤图像分析仪、场发射扫描电子显微镜、X 射线衍射仪和原子力显微镜）对所得 CMCNF 的特性进行了表征。结果表明，三元DES预处理能够对纤维原料进行羧甲基化改性，同时保持纤维素的晶体结构。此外，它还对纤维产生润湿和溶胀效应，从而在机械处理过程中成功破坏强氢键并快速产生纤维素纳米原纤维。羧甲基化改变增强了所得 CNF 的分散能力并增加了悬浮液的稳定性。此外，延长 DES 预处理的持续时间可以增强纤维原纤化过程并减少纤维聚合。生产的 CMCNF 表现出高纵横比，直径范围为 10 至 50 nm，长度延伸至几微米。这项研究提出了一种生产羧甲基化纳米原纤化纤维素的新方法和概念。它还介绍了一种简单、环保、有效的大规模生产竹浆纳米原纤化纤维素的方法。这一进步预计将提高竹纤维资源的加工和利用，从而有助于提高整体价值。
更新日期：2024-04-01
中文翻译：
三元反应性低共熔溶剂直接羧甲基化纤维素纤维制备高产纤维素纳米纤丝
采用由氯乙酸、尿素和氯化胆碱组成的三元低共熔溶剂 (DES) 体系对竹纤维进行预处理，制备出羧甲基化改性纤维素纳米纤丝 (CMCNF)。还采用了研磨处理。使用各种分析仪器（包括光纤图像分析仪、场发射扫描电子显微镜、X 射线衍射仪和原子力显微镜）对所得 CMCNF 的特性进行了表征。结果表明，三元DES预处理能够对纤维原料进行羧甲基化改性，同时保持纤维素的晶体结构。此外，它还对纤维产生润湿和溶胀效应，从而在机械处理过程中成功破坏强氢键并快速产生纤维素纳米原纤维。羧甲基化改变增强了所得 CNF 的分散能力并增加了悬浮液的稳定性。此外，延长 DES 预处理的持续时间可以增强纤维原纤化过程并减少纤维聚合。生产的 CMCNF 表现出高纵横比，直径范围为 10 至 50 nm，长度延伸至几微米。这项研究提出了一种生产羧甲基化纳米原纤化纤维素的新方法和概念。它还介绍了一种简单、环保、有效的大规模生产竹浆纳米原纤化纤维素的方法。这一进步预计将提高竹纤维资源的加工和利用，从而有助于提高整体价值。
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