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

Sensors

Phendukani Ncube²  Rui W. Krause¹ 

[1] Department of Chemical Technology, Faculty of Science, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, South Africa;

关键词: fluorescence;    chemosensor;    chlorinated by-product;    azo dye;    β-cyclodextrin polymer;   

DOI  :  10.3390/s110504598

来源: mdpi

【 摘 要 】

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 (K_s) 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.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.