Water soluble EDTA-linked chitosan as a zwitterionic flocculant for pH sensitive removal of Cu(II) ion
作者： Sayaka Fujita , Nobuo Sakairi
DOI: 10.1039/C5RA24175H
关键词: Chelation 、 Ethylenediaminetetraacetic acid 、 Reagent 、 Flocculation 、 Inorganic chemistry 、 Polyelectrolyte 、 Metal ions in aqueous solution 、 Aqueous solution 、 Chemistry 、 Chitosan
摘要: A linear and non-crosslinked polymer, EDTA-linked chitosan (ED-ch), was synthesized by N-acylation of with EDTA (ethylenediaminetetraacetic acid) monoanhydride under acidic to slightly basic aqueous conditions. The degree substitution (D.S.) residues in the product changeable depending on stoichiometry acylation reagent, structure confirmed elemental analysis, FT-IR, 1H 13C NMR spectroscopy. newly introduced functional group ED-ch provided properties such as being a strong chelating reagent an amphoteric polyelectrolyte. It found that had good water solubility both regions precipitated narrow pH region. Applicability removal heavy metal ions flocculation proven model experiment using 10 ppm Cu(II) solution. simple procedure, mixing D.S. 41% 70%, subsequent adjustment (4.5 2.5) centrifugal separation flocs formed, shown remove almost completely from residual concentration after these flocculation/separation process reached 0.03 ppm.
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