Ultrasensitive Na+ exchanging performance of free-standing Fe3O4@Na2Ti3O7 nanosheets indicated by fluorescein

Xuebo Cao; Xiudong Xue; Lianwen Zhu; Peng Chen; Yingying Song; Meng Chen

doi:10.1039/B921304J

Ultrasensitive Na⁺ exchanging performance of free-standing Fe₃O₄@Na₂Ti₃O₇nanosheets indicated by fluorescein†

Xuebo Cao,*^a Xiudong Xue,^a Lianwen Zhu,^a Peng Chen,^a Yingying Song^a and Meng Chen*^b

* Corresponding authors

^a Key Lab of Organic Synthesis of Jiangsu Province and Department of Chemistry, Soochow University, Suzhou, Jiangsu, P. R. China
E-mail: xbcao@suda.edu.cn
Fax: +86-512-65880089
Tel: +86-512-65880019

^b Department of Chemistry, Fudan University, Shanghai, P. R. China
E-mail: chenmeng@fudan.edu.cn

Abstract

A strategy of co-reaction of Fe and TiO₂ with concentrated NaOH was designed to prepare Na₂Ti₃O₇ nanosheets grown epitaxially by Fe₃O₄ crystallites, for the purpose of modifying interlayer structures and ion exchange properties of the layered compound Na₂Ti₃O₇. TiO₂ could react with NaOH to form lamellar intermediates while Fe could be converted into Fe₃O₄ to deposit on the surface of the intermediates. Eventually, free-standing Fe₃O₄@Na₂Ti₃O₇ nanosheets were successfully synthesized in an extremely high yield (∼95% efficiency). Fluorescein and its derivatives utilized as probes to study the ion exchange property of Fe₃O₄@Na₂Ti₃O₇ nanosheets, which could provide visual observations of the degree of ion exchange. The results indicate that the as-prepared Fe₃O₄@Na₂Ti₃O₇ nanosheets possess much more sensitive Na⁺ exchange performance than isolated Na₂Ti₃O₇ nanostructures, and hence they should have potential application in the extraction of trace active components, such as cationic amino acid and peptides in biology. Furthermore, the present strategy is also helpful in the design synthesis of other layered compounds grown epitaxially by magnetic clusters to achieve enhanced physicochemical properties.

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Article information

DOI: https://doi.org/10.1039/B921304J
Article type: Paper
Submitted: 14 Oct 2009
Accepted: 04 Jan 2010
First published: 04 Feb 2010

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J. Mater. Chem., 2010,20, 2322-2328

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Ultrasensitive Na⁺ exchanging performance of free-standing Fe₃O₄@Na₂Ti₃O₇ nanosheets indicated by fluorescein

X. Cao, X. Xue, L. Zhu, P. Chen, Y. Song and M. Chen, J. Mater. Chem., 2010, 20, 2322 DOI: 10.1039/B921304J

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Journal of Materials Chemistry