Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 183, Issue -, Pages 565-573Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2013.04.024
Keywords
Fluorescent sensor; Hg2+; Naphthalimide derivative; Covalent immobilization; Fluorescence enhancement
Funding
- Doctoral Research Fund of Henan Chinese Medicine [BSJJ2009-27]
- Key Science and Technology Programme of Henan Province [112PPTSF319-11]
- Henan College of Chinese Medicine
- Henan Natural Science Foundation of Education Department [2011B360005, 2009A350003]
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In this work, a selective fluorescent sensor for Hg2+ detection in aqueous solution, which contains a naphthalimide derivative covalently grafted to the glass surface, was developed. To fabricate the sensor, the naphthalimide derivative (compound 1) with a terminal double bond was prepared and photo-copolymerized with 2-hydroxyethyl methacrylate (HEMA) on the glass surface treated with a silanizing agent. Upon binding mercuric ions in 0.05 mol/L Tris/HCl (pH 7.01) at 25 degrees C, the resulting optical sensor undergoes fluorescence enhancement. Thus, the proposed sensor with visible excitation can behave as a fluorescent sensor for the selective detection of Hg2+. The fluorescence enhancement was induced by a photo-induced electron transfer (PET) inhibition process. In addition, the proposed sensor showed satisfactory selectivity, reproducibility and response time. The sensing membrane possesses a relatively long lifetime of at least 2 months. The chemosensor can be applied to the quantification of Hg2+ with a linear range covering from 6.0 x 10(-6) to 2.0 x 10(-4) M and a detection limit of 2.0 x 10(-6) M. The determination of Hg2+ in river water samples shows satisfactory results. (C) 2013 Elsevier B.V. All rights reserved.
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