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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
* Author to whom correspondence should be addressed.
Received: 9 February 2011; in revised form: 14 March 2011 / Accepted: 22 April 2011 / Published: 27 April 2011
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
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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.
Ncube P, Krause RW, Mamba BB. Fluorescent Sensing of Chlorophenols in Water Using an Azo Dye Modified β-Cyclodextrin Polymer. Sensors. 2011; 11(5):4598-4608.
Ncube, Phendukani; Krause, Rui W.; Mamba, Bhekie B. 2011. "Fluorescent Sensing of Chlorophenols in Water Using an Azo Dye Modified β-Cyclodextrin Polymer." Sensors 11, no. 5: 4598-4608.