Title of article :
An optical sensor based on H-acid/layered double hydroxide composite film for the selective detection of mercury ion Original Research Article
Author/Authors :
Zhiyong Sun، نويسنده , , Lan Jin، نويسنده , , Shitong Zhang، نويسنده , , Wenying Shi، نويسنده , , Min Pu، نويسنده , , Min Wei، نويسنده , , David G. Evans، نويسنده , , Chuan-xue Duan، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2011
Pages :
7
From page :
95
To page :
101
Abstract :
A novel optical chemosensor was fabricated based on 1-amino-8-naphthol-3,6-disulfonic acid sodium (H-acid) intercalated layered double hydroxide (LDH) film via the electrophoretic deposition (EPD) method. The film of H-acid/LDH with the thickness of 1 μm possesses a well c-orientation of the LDH microcrystals confirmed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The fluorescence detection for Hg(II) in aqueous solution was performed by using the H-acid/LDH film sensor at pH 7.0, with a linear response range in 1.0 × 10−7 to 1.0 × 10−5 mol L−1 and a detection limit of 6.3 × 10−8 mol L−1. Furthermore, it exhibits excellent selectivity for Hg(II) over a large number of competitive cations including alkali, alkaline earth, heavy metal and transitional metals. The specific fluorescence response of the optical sensor is attributed to the coordination between Hg(II) and sulfonic group in the H-acid immobilized in the LDH matrix, which was verified by NMR spectroscopy and UV–vis spectra. In addition, density functional theory (DFT) calculation further confirms that the coordination occurs between one Hg2+ and two O atoms in the sulfonic group, which is responsible for the significant fluorescence quenching of the H-acid/LDH film. The results indicate that the H-acid/LDH composite film can be potentially used as a chemosensor for the detection of Hg2+ in the environmental and biomedical field.
Keywords :
Layered double hydroxide , Intercalation , Mercury , Composite film , Determination , H-acid
Journal title :
Analytica Chimica Acta
Serial Year :
2011
Journal title :
Analytica Chimica Acta
Record number :
1026608
Link To Document :
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