Manufacturing sulfated cellulose nanofibers using a unique combined DES-based pretreatment-functionalization protocol for metal ion decontamination through porous adsorbents

IF 10.7 1区 化学 Q1 CHEMISTRY, APPLIED Carbohydrate Polymers Pub Date : 2024-11-14 DOI:10.1016/j.carbpol.2024.122974
Remedios Montenegro, Esther Rincón, Alejandro Rodríguez, Zoilo González
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Abstract

This study confirms the efficacy of a unique combined pretreatment-functionalization protocol based on the use of deep eutectic solvent (DES) to obtain sulfated lignocellulose and cellulose nanofibers (SLNF or SNF) hydrogels, which have been successfully shaped as sponge-based adsorbents and fruitfully assessed for the removal of heavy metals from water. A comprehensive characterization study was conducted, demonstrating an excellent degree of sulfation (0.62) in DES-treated wheat straw-derived nanofibers. The direct use of SLNF or SNF hydrogels and their application as porous sponges exhibited highly favorable characteristics for successful ion decontamination. Cu2+ removal was up to 70 % higher using DES-sulfated nanocellulose hydrogels compared to conventional treated-nanocellulose. Various isotherm models were studied, and the analysis of the kinetic and diffusion studies confirmed the influence of the sample format in the removal behavior. SLNF and SNF-sponges proved to be the most effective in adsorption, achieving Cu2+ removal rates of up to 60 %. More profitable decontamination processes with lower run times could be guessed when the application of nanocellulose is led through the processing of advanced formats. The easy handling of sponges would avoid the extra costs of the downstream unit operations which are sometimes needed to separate the hydrogel of the decontaminated media.

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利用基于 DES 的独特组合预处理-功能化协议制造硫酸化纤维素纳米纤维,通过多孔吸附剂进行金属离子净化
本研究证实了基于深共晶溶剂(DES)的独特组合预处理-功能化方案在获得硫酸化木质纤维素和纤维素纳米纤维(SLNF 或 SNF)水凝胶方面的功效,这种水凝胶已被成功塑造成海绵型吸附剂,并在去除水中重金属方面进行了卓有成效的评估。我们进行了一项全面的表征研究,结果表明经 DES 处理的小麦秸秆衍生纳米纤维的硫化程度极高(0.62)。SLNF 或 SNF 水凝胶的直接使用及其作为多孔海绵的应用表现出非常有利的特性,可成功去除离子污染。与传统的处理过的纳米纤维素相比,使用 DES 磺化的纳米纤维素水凝胶对 Cu2+ 的去除率可高达 70%。对各种等温线模型进行了研究,动力学和扩散研究分析证实了样品形式对去除行为的影响。事实证明,SLNF 和 SNF-海绵的吸附效果最好,对 Cu2+ 的去除率高达 60%。如果纳米纤维素的应用是通过先进格式的处理过程来实现的,那么就能以更短的运行时间实现更有利可图的净化过程。海绵易于处理,可避免下游单元操作的额外成本,因为有时需要分离去污介质中的水凝胶。
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来源期刊
Carbohydrate Polymers
Carbohydrate Polymers 化学-高分子科学
CiteScore
22.40
自引率
8.00%
发文量
1286
审稿时长
47 days
期刊介绍: Carbohydrate Polymers stands as a prominent journal in the glycoscience field, dedicated to exploring and harnessing the potential of polysaccharides with applications spanning bioenergy, bioplastics, biomaterials, biorefining, chemistry, drug delivery, food, health, nanotechnology, packaging, paper, pharmaceuticals, medicine, oil recovery, textiles, tissue engineering, wood, and various aspects of glycoscience. The journal emphasizes the central role of well-characterized carbohydrate polymers, highlighting their significance as the primary focus rather than a peripheral topic. Each paper must prominently feature at least one named carbohydrate polymer, evident in both citation and title, with a commitment to innovative research that advances scientific knowledge.
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