title: Fluorescent sensing of chlorophenols in water using an azo dye modified β-cyclodextrin polymer.
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 (1)H-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 × 10(3) M(-1) for 2,4-dichlorophenol and 1.120 × 10(2) M(-1) for 4-chlorophenol.
authors.affiliation: Department of Chemical Technology, Faculty of Science, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, South Africa. p.ncube@yahoo.co.uk
authors.forename: Phendukani
authors.initials: P
authors.lastname: Ncube
authors.forename: Rui W
authors.initials: RW
authors.lastname: Krause
authors.forename: Bhekie B
authors.initials: BB
authors.lastname: Mamba
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D002482:Cellulose / Q000737:chemistry*; D002733:Chlorophenols / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D003505:Cyclodextrins / Q000737:chemistry*; D005453:Fluorescence; D014867:Water / Q000737:chemistry*; D047392:beta-Cyclodextrins / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D002733:Chlorophenols; D004396:Coloring Agents; D003505:Cyclodextrins; D047392:beta-Cyclodextrins; C041953:cyclodextrin polymer; D014867:Water; D002482:Cellulose