Polymer‐immobilized cyclodextrin trapping of model organic pollutants in flowing water streams

Abstract

Epichlorohydrin-crosslinked ␤-cyclodextrin polymers (BCDPs) were prepared and characterized by Fourier transform infrared. Beads of the BCDPs were used to pack a column for trapping organic contaminants in flowing water (flow rate ϭ 5-32 mL/min). The contaminants were naphthalene (a model for polyaromatic hydrocarbons), naproxen (a model for pollutants of pharmaceutical origin), and 2-naphthol (a model for pesticides with pH-dependent ionization states). The trapping efficiencies were determined with fluorescence spectroscopy as the analytical technique. The best trapping efficiencies were obtained for BCDPs with a nominal cyclodextrin/epichlorohydrin ratio of 1:29. Trapping was highly efficient for naphthalene (98%) and 2-naphthol (70%), but it was much less efficient for naproxen (18%). Possible causes for these differences were examined. The trapped organics could be flushed from the column with an ethanol wash. The recovery of the organics with this approach was very good (Ͼ95%). This simple column design, made of inexpensive and reusable materials, has potential applications in water remediation and water sampling.

Studies of Triton X-165–β-cyclodextrin interactions using both extrinsic and intrinsic fluorescence

“…The study of interactions between surfactant and sugars [8], in particular cyclodextrins [9], has an objective to improve and increase the field of application of the cyclodextrins (CDs). The potential application of CDs has been found in targeted drug delivery, as they are capable of solubilizing hydrophobic drugs [10][11][12][13][14][15][16][17]. This application requires an understanding of the effect of CDs on the cell membranes in as much as the utility of CDs in drug delivery would be little in the event of their disrupting 0021-9797/$ -see front matter Ó 2010 Elsevier Inc. All rights reserved.…”

Isosteric heats of sorption of 1-naphthol and phenol from aqueous solutions by β-cyclodextrin polymers

“…The potential uses of the product are significantly increased if the polymerized CDs provide other possible binding sites to the host molecules different from the cavity of the CD. Besides, depending on the polymerization conditions, insoluble polymers can be produced, which have found applications in the removal of water pollutants, in chromatography, or in the pharmaceutical and food industries [1,4,5].…”

Sorption of Aromatic Compounds with Copolymer Sorbent Materials Containing β-Cyclodextrin

“…Selective adsorption of adsorbates according to their size and physical properties were observed for phenolate and naphthenate anions in aqueous solution [27]. Thus, β-CD copolymer materials have significant potential for the sequestration of chlorophenol and related organic contaminants in aquatic and soil media to safe concentration levels [15,17,18,28]. …”