Preparation and characterization of polymeric ligand exchanger based on chitosan hydrogel for selective removal of phosphate

Byungryul An, Ka Young Jung, Dongye Zhao, Sang-Hyup Lee, Jae Woo Choi

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Polymeric ligand exchangers (PLEs) are typically prepared using commercial chelating resins which are often costly and less "green". In this work, we prepared a new PLE by immobilizing Cu(II) on a low-cost, natural biopolymer chitosan. It was confirmed that the Cu2+ ions were bonded to chitosan by complexing with the nitrogen and hydroxyl groups in the chitosan polymer chain, leading to a reduction in the size of the hydrogel and intensified density of the biopolymer. The chelating interaction between nitrogen and Cu2+ acts as a crosslinker that improves the physical and chemical stability of the PLE. The pH sorption tests confirmed a pKa of ∼7.0 for the biopolymer. The PLE reverses the affinity sequence of standard anionic resins, and displayed much greater affinity toward strong ligands such as phosphate than sulfate due to concurrent electrostatic and Lewis acid-base interactions between immobilized Cu2+ ions and phosphate regardless of solution pH. The maximum phosphate uptake was estimated to be 70 mg g-1 and 35 mg g-1 in single and binary-component systems, respectively. Fixed-bed column tests revealed that the PLE may be used for selective removal of phosphate of strong ligand characteristics over sulfate.

Original languageEnglish
Pages (from-to)45-53
Number of pages9
JournalReactive and Functional Polymers
Volume85
DOIs
Publication statusPublished - 2014 Jan 1

Keywords

  • Chitosan
  • Phosphate
  • Polymeric ligand exchanger
  • Sorption
  • Stability

ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics
  • Chemistry(all)
  • Chemical Engineering(all)
  • Environmental Chemistry
  • Biochemistry

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