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Demand on high-performance ion exchangers is ever-increasing in energy and environment applications. Among many cation exchangers, layered alkali titanates generally show larger cation exchange capacity, but slower cation exchange rate due to their two-dimensional (2D) micrometer-size particle morphologies, which limits their practical applications. Here, we report a rational conversion of a layered sodium titanate, Na2Ti3O7, to the corresponding one-dimensional (1D) ultra-narrow nanowires via hydrothermal treatment under basic conditions. The formation of nanowires is thought to involve the partial exfoliation of Na2Ti3O7 to form thin plate-like particles that subsequently split into nanowires along a crystallographically defined, chemically selective weakness in the Na2Ti3O7 crystals. This process is similar to a recently burgeoning materials design using atomic-level weakness in solids, such as zeolites and metal-organic frameworks. Our proposed formation scheme is further supported by comparative experiments performed on another layered alkali titanate, K0.8Ti1.73Li0.27O4, which possesses randomly distributed defects at the Ti sites. Thanks to the shortening of diffusion path lengths of the interlayer cations, the resulting Na2Ti3O7 nanowires show an excellent cation exchange performance toward Cd2+ in aqueous solution, exceeding several existing cation exchanges such as zeolites and organic resins.

権利情報:

• In Copyright
  

  This is the peer reviewed version of the following article: E. Moustafa, M. Esmat, A. Iwanade, M. Oishi, T. Nagai, N. Tsunoji, N. Fukata, W. Chaikittisilp, Y. Ide, 2D-to-1D Conversion of a Layered Sodium Titanate via Rational Framework Splitting for Highly Efficient Cation Exchange. Small Methods 2025, 9, 2400947, which has been published in final form at https://doi.org/10.1002/smtd.202400947. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.

キーワード: nanowire, layered titanate , ion exchange, MOF, zeolite

刊行年月日: 2024-11-14

出版者: Wiley

掲載誌:

• Small Methods (ISSN: 23669608) vol. 9 issue. 3 2400947

研究助成金:

• MEXT JPMXP1223NM51

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6058

公開URL: https://doi.org/10.1002/smtd.202400947

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更新時刻: 2025-12-23 15:16:56 +0900

MDRでの公開時刻: 2025-12-23 16:20:19 +0900