Ion exchange textiles from the finishing of PET fabrics with cyclodextrins and citric acid for the sorption of metallic cations in water

Original Article

Abstract

We describe a chemical method based on the use of cyclodextrins (CDs) and citric acid (CTR) as finishing chemicals for the modification of polyester fibers (PET). It was observed that the reaction between these reactants yielded a cross-linked polymer, by formation of ester functions between the polyol (CD) and the polycarboxylic acid (CTR). This polymer (called polyCTR-CD) permanently coated the PET fibers. The chemical structure of polyCTR-CD consisted of CD moieties and unreacted carboxylate groups. Theses groups resulted from the partial reaction of CTR and yielded ion exchange property to the fibers. The purpose of this paper was to set up the finishing parameters in order to obtain the best possible ion exchange capacity (IEC) of the fabrics. Firstly, we observed that the IEC did not perfectly evolve with the grafting rate (expressed in %-wt) of the fibers; As a matter of fact, we observed that a maximal IEC of 0.4–0.5 mmol/g of fabric was obtained for a compromise between the amount of polyCTR-CD fixed onto the fibers, and its cross-linking rate. In fact, the lesser the cross-linking rate, the more unreacted carboxylic groups remained on the fibers. Second, it was observed that CDs could not be replaced by starch in this process, because the later resulted to inferior IEC values than textiles grafted with CDs and CTR. Finally, the ion exchange finished fabrics were applied in the decontamination of water solutions containing Pb2+, Ni2+ and Cd2+. It was observed that 0.3 mmol of each cation were adsorbed per gram of fabrics.

Keywords

Textile finishing Cyclodextrins Citric acid Ion exchange textile Heavy metals Depollution 

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Copyright information

© Springer Science+Business Media, Inc. 2007

Authors and Affiliations

  • L. Ducoroy
    • 1
  • B. Martel
    • 1
  • B. Bacquet
    • 1
  • M. Morcellet
    • 1
  1. 1.Laboratoire de Chimie Organique et Macromoléculaire, UMR CNRS 8009Université des Sciences et Technologies de LilleVilleneuve d’AscqFrance

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