Detection of lead ion binding on bifunctional chelating/ion-exchange resins by cross-polarization/magic-angle spinning solid-state nuclear magnetic resonance

Cheng Chien Wang, Chuh Yung Chen

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Solid-state nuclear magnetic resonance (S-NMR) can reveal much useful information, including conformations, stereoregularity, defect structures, and comonomer sequence. S-NMR is especially useful for revealing microstructural differences that can alter local polymer chains. A series of bifunctional chelating/ion-exchange resins, containing differing ratios of iminodiacetic acid to acetic acid, were synthesized. Cross-polarization magic-angle spinning (CP/MAS) 13C-NMR was employed to measure conformation changes both before and after the bonding of ligands and lead ion adsorbed on bifunctional chelated/ion-exchange resins in this investigation. From the 13C-NMR spectra, as the lead ion was adsorbed by the iminodiacetic acid chelating group, the motion of molecular chain would be inhibited and the resonance peaks of the carboxylate anion at 170 ppm would shift downfield. Compared to the FTIR results, the downfield shift of the resonance peaks indicated that the bonding of carboxylate anion and lead ion adsorbed displayed an ionic trend. Furthermore, the bonding of the carboxylic group and lead ion adsorbed changed from ionic to covalent as the chelating group in bifunctional/ion-exchange resins decreased. The linear relationship between the areas of those resonance peaks and the amount of lead ion adsorbed was obtained from the spectra fitting.

Original languageEnglish
Pages (from-to)919-928
Number of pages10
JournalJournal of Applied Polymer Science
Volume85
Issue number5
DOIs
Publication statusPublished - 2002 May 21

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

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