Valorized soybean hulls as TEMPO-oxidized cellulose nanofibril and polyethylenimine composite hydrogels and their potential removal of water pollutants
Valorized soybean hulls as TEMPO-oxidized cellulose nanofibril and polyethylenimine composite hydrogels and their potential removal of water pollutants
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DOI：
10.1007/s10570-023-05086-y
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发表时间：
2023-02-13
期刊：
影响因子：
5.7
通讯作者：
Peresin, Maria S. S.
中科院分区：
文献类型：
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作者：
Nan, Yufei;Gomez-Maldonado, Diego;Peresin, Maria S. S.
纤维素纳米材料（CNM）和聚乙烯亚胺（PEI）复合材料因其多功能特性而受到越来越多的关注，并已应用于不同领域。在这项工作中，大豆皮被转化为羧基纤维素纳米纤维（COOH - CNFs），并通过阳离子螯合和物理吸附策略与PEI复合成水凝胶。在通过TEMPO介导的反应进行氧化之前，先从大豆皮中制备纤维素纳米纤维（CNFs）以获得COOH - CNFs；然后向1.5%的COOH - CNF水溶液中滴加氯化锌，放置24小时形成COOH - CNF水凝胶。最后，在不同的pH值下，使用不同浓度的PEI溶液对水凝胶进行功能化。元素分析结果表明，在pH为11.6时，20%的PEI水溶液是合成COOH - CNF/PEI水凝胶的最佳条件。此外，还测试了其从水中去除阴离子甲基蓝染料和Cu（II）离子的吸附效率，24小时后分别达到82.6%和69.8%。这些结果表明COOH - CNF/PEI水凝胶作为水修复吸附材料具有巨大潜力。
Cellulose nanomaterial (CNM) and polyethylenimine (PEI) composites have attracted growing attention due to their multifunctional characteristics, which have been applied in different fields. In this work, soybean hulls were valorized into carboxyl cellulose nanofibrils (COOH-CNFs), and composited into hydrogels with PEI by combining them with cationic chelating and physical adsorption strategies. Cellulose nanofibrils (CNFs) were produced from soybean hulls prior to oxidation by a TEMPO mediated reaction to obtain COOH-CNFs; then drops of zinc chloride were added to 1.5% aqueous COOH-CNF dispersions, which were left for 24 h to form COOH-CNF hydrogels. Finally, the hydrogels were functionalized using different concentration of PEI solutions over a range of pH values. Elemental analysis results showed that 20% aq. PEI at pH 11.6 is the optimum condition to synthesize the COOH-CNF/PEI hydrogels. Additionally, the adsorption efficiency for the removal of anionic methyl blue dyes and Cu(II) ions from water was tested, reaching 82.6% and 69.8%, respectively, after 24 h. These results demonstrate the great potential of COOH-CNF/PEI hydrogels as adsorbent materials for water remediation.