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Issue 11, 2020
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Safranin O-functionalized cuboid mesoporous silica material for fluorescent sensing and adsorption of permanganate

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Abstract

Incorporation of dual functions, i.e., sensing and adsorption, into one single organic–inorganic hybrid material for the detection and removal of toxic permanganate (MnO4) ions is of great importance, representing a challenging and new task in the design and application of new functional materials. However, most of the reported materials display only one function as either sensing probes or adsorbents. In this work, a fluorescent cuboid mesoporous silica-based hybrid material (SiO2@SFNO) is first prepared by the covalent coupling of a new safranin O-based fluorophore (2,8-dimethyl-5-phenyl-3,7-bis(3-(3-(triethoxysilyl)propyl)ureido)phenazin-5-ium chloride) (SFNO) and newly-made cuboid mesoporous silica, which showed selective dual-functional activities towards MnO4 and green emission at 575 nm with a long-range excitation wavelength that is suitable for bio-imaging application. The design of this SiO2@SFNO material is based on the position of –NHCONH– groups, which are mainly responsible for the strong and selective coordination with MnO4. SiO2@SFNO is responsive to MnO4 at parts per billion (67 ppb) level; it also displays high adsorption ability (292 mg g−1) to MnO4 in aqueous solutions. The fluorescence responses of MnO4in vivo (limnodrilus claparedianus and zebrafish) demonstrate the possibility of further application in biology. Interestingly, this SiO2@SFNO material is also capable of monitoring trace amounts of Hg2+ and Cu2+ in living organisms, holding great potential in bio-related applications.

Graphical abstract: Safranin O-functionalized cuboid mesoporous silica material for fluorescent sensing and adsorption of permanganate

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Supplementary files

Article information


Submitted
06 Jan 2020
Accepted
27 Jan 2020
First published
29 Jan 2020

J. Mater. Chem. B, 2020,8, 2238-2249
Article type
Paper

Safranin O-functionalized cuboid mesoporous silica material for fluorescent sensing and adsorption of permanganate

S. Chatterjee, J. Qin, X. Li, F. Liang, D. K. Rai and Y. Yang, J. Mater. Chem. B, 2020, 8, 2238
DOI: 10.1039/D0TB00036A

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