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Sensors 2011, 11(5), 4598-4608; doi:10.3390/s110504598

Fluorescent Sensing of Chlorophenols in Water Using an Azo Dye Modified β-Cyclodextrin Polymer

Department of Chemical Technology, Faculty of Science, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, South Africa
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Received: 9 February 2011 / Revised: 14 March 2011 / Accepted: 22 April 2011 / Published: 27 April 2011
(This article belongs to the Section Chemical Sensors)
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Abstract

A water soluble azo dye modified β-cyclodextrin polymer 4 was synthesized and used as a chemosensor for the detection of chlorinated phenols, model chlorinated by-products (CBPs) of water treatment for drinking purposes. The characterization of the intermediates and the azo dye modified β-CD polymer was done by UV/Vis Spectrophotometry, FT-IR and 1H-NMR spectroscopies. The chlorophenols were capable of quenching the fluorescence of the polymer. The polymer showed greater sensitivity towards 2,4-dichlorophenol, with a sensitivity factor of 0.35 compared to 0.05 and 0.12 for phenol and 4-chlorophenol, respectively. The stability constants (Ks) of the pollutants were also determined by the Benesi-Hildebrand method to be 2.104 × 103 M−1 for 2,4-dichlorophenol and 1.120 × 102 M−1 for 4-chlorophenol.
Keywords: fluorescence; chemosensor; chlorinated by-product; azo dye; β-cyclodextrin polymer fluorescence; chemosensor; chlorinated by-product; azo dye; β-cyclodextrin polymer
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Ncube, P.; Krause, R.W.; Mamba, B.B. Fluorescent Sensing of Chlorophenols in Water Using an Azo Dye Modified β-Cyclodextrin Polymer. Sensors 2011, 11, 4598-4608.

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