HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Environmental Science / Faculty of Environmental Earth Science >
Peer-reviewed Journal Articles, etc >

Water soluble EDTA-linked chitosan as a zwitterionic flocculant for pH sensitive removal of Cu(II) ion

Files in This Item:
c5ra24175h.pdf2.17 MBPDFView/Open
Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/64389

Title: Water soluble EDTA-linked chitosan as a zwitterionic flocculant for pH sensitive removal of Cu(II) ion
Authors: Fujita, Sayaka Browse this author
Sakairi, Nobuo Browse this author →KAKEN DB
Issue Date: 27-Jan-2017
Publisher: Royal Society of Chemistry
Journal Title: RSC advances
Volume: 6
Issue: 13
Start Page: 10385
End Page: 10392
Publisher DOI: 10.1039/c5ra24175h
Abstract: A linear and non-crosslinked polymer, EDTA-linked chitosan (ED-ch), was synthesized by N-acylation of chitosan with EDTA (ethylenediaminetetraacetic acid) monoanhydride under acidic to slightly basic aqueous conditions. The degree of substitution (D.S.) of EDTA residues in the product was changeable depending on the stoichiometry of the acylation reagent, and the structure was confirmed by elemental analysis, FT-IR, H-1 and C-13 NMR spectroscopy. The newly introduced functional group in ED-ch provided properties such as being a strong chelating reagent and an amphoteric polyelectrolyte. It was found that ED-ch had good water solubility in both acidic and basic regions and precipitated in a narrow pH region. Applicability of ED-ch to the removal of heavy metal ions by flocculation was proven by a model experiment using 10 ppm Cu(II) solution. A simple procedure, mixing ED-ch with D.S. 41% and 70%, and subsequent pH adjustment (4.5 and 2.5) and centrifugal separation of the flocs formed, was shown to remove Cu(II) almost completely from aqueous solution. The residual Cu(II) concentration after these flocculation/separation process with ED-ch reached 0.03 ppm.
Type: article (author version)
URI: http://hdl.handle.net/2115/64389
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 坂入 信夫

Export metadata:

OAI-PMH ( junii2 , jpcoar )

MathJax is now OFF:


 

 - Hokkaido University