Preparation of Aqueous Dispersions of TEMPO-Oxidized Cellulose Nanofibrils with Various Metal Counterions and Their Super Deodorant Performances

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• 作者：Atsushi Sone ; Tsuguyuki Saito ; Akira Isogai
• 刊名：ACS Macro Letters
• 出版年：2016
• 出版时间：December 20, 2016
• 年：2016
• 卷：5
• 期：12
• 页码：1402-1405
• 全文大小：326K
• ISSN：2161-1653

文摘

2,2,6,6-Tetramethylpiperidine-1-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.