A fluorescent chitosan hydrogel detection platform for the sensitive and selective determination of trace mercury(II) in water

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Author(s)
Geng, Zhigang
Zhang, Haimin
Xiong, Qizhong
Zhang, Yunxia
Zhao, Huijun
Wang, Guozhong
Griffith University Author(s)
Year published
2015
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In this work, a three-dimensional (3D) chitosan hydrogel with superior fluorescence properties was successfully fabricated by modifying chitosan fibers with glutaric dialdehyde (GD) via a simple cross-linking approach. The resulting three-dimensional fluorescent chitosan hydrogel (3D-FCH) with hydrophilic properties exhibited a strong blue fluorescence emission at an excitation wavelength of 337 nm. The fluorescence mechanism of the as-synthesized 3D-FCH was investigated and proposed in detail using X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR) techniques. As a solid-phase fluorescent ...
View more >In this work, a three-dimensional (3D) chitosan hydrogel with superior fluorescence properties was successfully fabricated by modifying chitosan fibers with glutaric dialdehyde (GD) via a simple cross-linking approach. The resulting three-dimensional fluorescent chitosan hydrogel (3D-FCH) with hydrophilic properties exhibited a strong blue fluorescence emission at an excitation wavelength of 337 nm. The fluorescence mechanism of the as-synthesized 3D-FCH was investigated and proposed in detail using X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR) techniques. As a solid-phase fluorescent probe, the 3D-FCH was used to selectively and sensitively determine mercury(II) (Hg2+) ions in aqueous media. The results demonstrated that a prominent fluorescence quenching at 401 nm was observed in the presence of Hg2+ with a linear response range of 5.0–50 nM and an estimated limit of detection of 0.9 nM. The fluorescence quenching mechanism could be ascribed to the strong complexation between Hg2+ and the GD fluorophore with a conjugate structure. Moreover, the porous structure of the chitosan hydrogel and the high adsorption capacity of the chitosan fibers in the hydrogel could be very favorable for the rapid fluorescence determination of Hg2+. This work may pave a new way to develop low-cost fluorescent chitosan hydrogels as solid-phase fluorescence determination platforms to replace traditional liquid-phase fluorophores for application in the fluorescence detection of heavy metal ions.
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View more >In this work, a three-dimensional (3D) chitosan hydrogel with superior fluorescence properties was successfully fabricated by modifying chitosan fibers with glutaric dialdehyde (GD) via a simple cross-linking approach. The resulting three-dimensional fluorescent chitosan hydrogel (3D-FCH) with hydrophilic properties exhibited a strong blue fluorescence emission at an excitation wavelength of 337 nm. The fluorescence mechanism of the as-synthesized 3D-FCH was investigated and proposed in detail using X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR) techniques. As a solid-phase fluorescent probe, the 3D-FCH was used to selectively and sensitively determine mercury(II) (Hg2+) ions in aqueous media. The results demonstrated that a prominent fluorescence quenching at 401 nm was observed in the presence of Hg2+ with a linear response range of 5.0–50 nM and an estimated limit of detection of 0.9 nM. The fluorescence quenching mechanism could be ascribed to the strong complexation between Hg2+ and the GD fluorophore with a conjugate structure. Moreover, the porous structure of the chitosan hydrogel and the high adsorption capacity of the chitosan fibers in the hydrogel could be very favorable for the rapid fluorescence determination of Hg2+. This work may pave a new way to develop low-cost fluorescent chitosan hydrogels as solid-phase fluorescence determination platforms to replace traditional liquid-phase fluorophores for application in the fluorescence detection of heavy metal ions.
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Journal Title
Journal of Materials Chemistry A
Volume
3
Issue
38
Copyright Statement
© 2015 Royal Society of Chemistry. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal website for access to the definitive, published version.
Subject
Macromolecular and materials chemistry
Macromolecular and materials chemistry not elsewhere classified
Materials engineering