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

Title
Preparation and characterization of polymeric ligand exchanger based on chitosan hydrogel for selective removal of phosphate
Authors
안병렬정가영Dongye Zhao이상협최재우
Keywords
phosphate; polymeric ligand exchanger; chitosan; sorption; stability
Issue Date
2014-12
Publisher
Reactive & functional polymers
Citation
VOL 85, 45-53
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.
URI
http://pubs.kist.re.kr/handle/201004/48306
ISSN
13815148
Appears in Collections:
KIST Publication > Article
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