An, Byungryul Jung, Ka-Young Zhao, Dongye Lee, Sang-Hyup Choi, Jae-Woo 2024-01-20T08:30:15Z 2024-01-20T08:30:15Z 2021-09-02 2014-12 1381-5148 https://pubs.kist.re.kr/handle/201004/126053 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 pK(a) of similar to 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. (C) 2014 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV Preparation and characterization of polymeric ligand exchanger based on chitosan hydrogel for selective removal of phosphate Article 10.1016/j.reactfunctpolym.2014.10.003 1 REACTIVE & FUNCTIONAL POLYMERS, v.85, pp.45 - 53 REACTIVE & FUNCTIONAL POLYMERS 85 45 53 N scie scopus 000347274800006 2-s2.0-84908406607 Chemistry, Applied Engineering, Chemical Polymer Science Chemistry Engineering Polymer Science Article CHELATING RESIN METAL-IONS SORPTION COPPER EUTROPHICATION COMPLEXATION ADSORPTION BEADS DERIVATIVES BIOSORBENTS Phosphate Polymeric ligand exchanger Chitosan Sorption Stability