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首页> 外文期刊>ACS Macro Letters >Preparation of Aqueous Dispersions of TEMPO-Oxidized Cellulose Nanofibrils with Various Metal Counterions and Their Super Deodorant Performances
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Preparation of Aqueous Dispersions of TEMPO-Oxidized Cellulose Nanofibrils with Various Metal Counterions and Their Super Deodorant Performances

机译：TEMPO氧化纤维素纳米纤维与各种金属反离子的水分散体的制备及其超强除臭性能

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摘要

2,2,6,6-Tetramethylpiperidine-l-oxyl (TEMPO)-oxidized cellulose nanofibrils (TOCNs) with sodium carboxylate groups (TOCN-Na) were nanodispersed in water. The Na+ ions of TOCN-Na were exchanged with other monovalent, divalent, and trivalent metal (M) ions. When an aqueous metal acetate or AlCl3 solution was added to a 0.1% TOCN-Na/water dispersion or TOCN-COOH gel/water mixture under suitable conditions followed by sonication in water, individually nanodispersed TOCNs-M with divalent and trivalent metal counterions were obtained in yields of 24-87%. The amount of metal introduced into TOCN-M was approximately 20-50% of the TOCN carboxylate content when divalent and trivalent metal ions were used. These results indicate that intrafibrillar ionic linkages are selectively formed and these TOCN-M species nanodisperse at the individual nanofiber level without agglomeration in water. Filter papers with adsorbed TOCN-Cu/water and TOCN-Ag/water dispersions efficiently decomposed or adsorbed H2S and CH3SH gases, but filter papers containing fibrous TEMPO-oxidized celluloses with Ag+ or Cu2+ counterions had much lower gas-decomposition efficiencies.
机译：将具有羧酸钠基团（TOCN-Na）的2,2,6,6-四甲基哌啶-1-氧基（TEMPO）氧化的纤维素纳米原纤维（TOCN）纳米分散在水中。 TOCN-Na的Na +离子与其他一价，二价和三价金属（M）离子交换。在适当的条件下，将金属乙酸盐或AlCl3水溶液添加到0.1％TOCN-Na /水分散体或TOCN-COOH凝胶/水混合物中，然后在水中超声处理时，得到分别分散有二价和三价金属抗衡离子的TOCNs-M。产量为24-87％。当使用二价和三价金属离子时，引入到TOCN-M中的金属量约为TOCN羧酸盐含量的20-50％。这些结果表明，原纤维内离子键被选择性地形成，并且这些TOCN-M物种在各个纳米纤维水平上纳米分散而不会在水中团聚。吸附有TOCN-Cu /水和TOCN-Ag /水分散体的滤纸可以有效地分解或吸附H2S和CH3SH气体，但是含有TEMPO氧化纤维素和Ag +或Cu2 +平衡离子的滤纸的气体分解效率要低得多。

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