University of Oulu

J. A. Sirviö, M. Visanko and H. Liimatainen, RSC Adv., 2016, 6, 56544, DOI: 10.1039/C6RA08301C

Synthesis of imidazolium-crosslinked chitosan aerogel and its prospect as a dye removing adsorbent

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Author: Sirviö, Juho Antti1; Visanko, Miikka1; Liimatainen, Henrikki1
Organizations: 1Fiber and Particle Engineering Research Unit, University of Oulu, P.O. Box 4300, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.3 MB)
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Language: English
Published: Royal Society of Chemistry, 2016
Publish Date: 2017-07-03


The potential utility of Debus–Radziszewski imidazole synthesis in the fabrication of crosslinked chitosan was studied. Three-component crosslinkingwas achieved by using glyoxal and propionaldehyde to connect amine groups of chitosan via imidazolium crosslinking. A water-insoluble (at pH range of 2–10) chitosan was obtained at room temperature with a degree of substitution of 0.45 and aerogel was obtained after freezedrying. The ability of the imidazolium-crosslinked chitosan (ICC) aerogel to absorb an anionic dye, Direct Yellow 27, from a model water was then studied. Based on the Langmuir isotherm, at a pH of 4, an adsorption maximum of 2340 mg g⁻¹ (3.5 mmol g⁻¹) was obtained. In addition, due to the permanent cationic charge of imidazolium group, ICC exhibited excellent adsorption capacity, even under alkaline conditions. Methylglyoxal and benzaldehyde were also used to obtain other types of ICC, demonstrating the versatility of Debus–Radziszewski imidazole synthesis for fabrication of modified chitosan.

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Series: RSC advances
ISSN: 2046-2069
ISSN-E: 2046-2069
ISSN-L: 2046-2069
Volume: 6
Issue: 61
Pages: 56544 - 56548
DOI: 10.1039/c6ra08301c
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Dataset Reference: Supplementary files
Copyright information: This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.